2021Journal Article ER4 Auteurs : Bourdelle, Franck; Lloret, Emily; Durand, Cyril; Airaghi, Laura Evaluation of scanning transmission X-ray microscopy at the Mn L2,3-edges as a potential probe for manganese redox state in natural silicates In: Physics and Chemistry of Minerals, vol. 48, no. 4, 2021. Links @article{Bourdelle2021a,
title = {Evaluation of scanning transmission X-ray microscopy at the Mn L2,3-edges as a potential probe for manganese redox state in natural silicates},
author = {Franck Bourdelle and Emily Lloret and Cyril Durand and Laura Airaghi},
doi = {10.1007/s00269-021-01142-w},
year = {2021},
date = {2021-03-01},
journal = {Physics and Chemistry of Minerals},
volume = {48},
number = {4},
publisher = {Springer Science and Business Media LLC},
keywords = {ER4},
pubstate = {published},
tppubtype = {article}
}
|
2021Journal Article ER4 Auteurs : Bourdelle, Franck; Dubois, Michel; Lloret, Emily; Durand, Cyril; Addad, Ahmed; Bounoua, Schéhérazade; Ventalon, Sandra; Recourt, Philippe Kaolinite-to-Chlorite Conversion from Si,Al-Rich Fluid-Origin Veins/Fe-Rich Carboniferous Shale Interaction In: Minerals, vol. 11, no. 8, pp. 804, 2021. Links @article{Bourdelle2021b,
title = {Kaolinite-to-Chlorite Conversion from Si,Al-Rich Fluid-Origin Veins/Fe-Rich Carboniferous Shale Interaction},
author = {Franck Bourdelle and Michel Dubois and Emily Lloret and Cyril Durand and Ahmed Addad and Schéhérazade Bounoua and Sandra Ventalon and Philippe Recourt},
doi = {10.3390/min11080804},
year = {2021},
date = {2021-07-01},
journal = {Minerals},
volume = {11},
number = {8},
pages = {804},
publisher = {MDPI AG},
keywords = {ER4},
pubstate = {published},
tppubtype = {article}
}
|
2021Journal Article ER4 Auteurs : Seyler, M.; Witt, C.; na, B. Oma; Durand, Cyril; Chiaradia, M.; Villagomez, D.; Poujol, Marc Late Cretaceous felsic intrusions in oceanic plateau basalts in SW Ecuador: Markers of subduction initiation? In: Journal of South American Earth Sciences, vol. 110, pp. 103348, 2021, (ACL). Links @article{seyler:insu-03244185,
title = {Late Cretaceous felsic intrusions in oceanic plateau basalts in SW Ecuador: Markers of subduction initiation?},
author = {M. Seyler and C. Witt and B. Oma na and Cyril Durand and M. Chiaradia and D. Villagomez and Marc Poujol},
url = {https://hal-insu.archives-ouvertes.fr/insu-03244185},
doi = {10.1016/j.jsames.2021.103348},
year = {2021},
date = {2021-10-01},
urldate = {2021-10-01},
journal = {Journal of South American Earth Sciences},
volume = {110},
pages = {103348},
publisher = {Elsevier},
note = {ACL},
keywords = {ER4},
pubstate = {published},
tppubtype = {article}
}
|
2020Journal Article ER4 Auteurs : Guillot, François; Averbuch, Olivier; Dubois, Michel; Durand, Cyril; Lanari, Pierre; Gauthier, Arnaud Zircon age of vaugnerite intrusives from the Central and Southern Vosges crystalline massifs (E France): contribution to the geodynamics of the European Variscan belt In: Bulletin de la Societe Géologique de France, vol. 191, no. 26, 2020, (ACLN). Abstract @article{Guillot2020,
title = {Zircon age of vaugnerite intrusives from the Central and Southern Vosges crystalline massifs (E France): contribution to the geodynamics of the European Variscan belt},
author = {François Guillot and Olivier Averbuch and Michel Dubois and Cyril Durand and Pierre Lanari and Arnaud Gauthier},
year = {2020},
date = {2020-01-01},
journal = {Bulletin de la Societe Géologique de France},
volume = {191},
number = {26},
abstract = {Datation du zircon de vaugnérites des Vosges centrales et méridionales
: contribution à la géodynamique de l’orogène varisque d’Europe.
Afin d’avancer dans la compréhension de la géodynamique des zones
de suture varisque au stade tardif de la collision (en particulier
au regard de l’évolution du système orogénique en contexte de HT),
nous nous sommes intéressés à la mise en place des vaugnérites, roches
basiques ultra-potassiques intrusives au sein des ensembles granito-gneissiques
de la croûte varisque des Vosges. Ces roches, souvent associées aux
ensembles granitiques tardi-collisionnels, sont de faible extension
mais quasiment toujours présentes au sein de ces systèmes. Elles
affleurent (1) dans les Vosges méridionales, en masses plutoniques
marginales du Granite des Ballons et (2) dans les Vosges centrales
(région de Plainfaing), en filons composites, intrusifs dans un complexe
de migmatites et de roches métamorphiques appelées granite-gneiss.
Les vaugnérites sont des roches mélanocrates à biotite et hornblende
magnésiennes (20 à 40 % vol, 64 < mg# < 78), présentant des signatures
géochimiques caractéristiques de roches ultra-potassiques mafiques
à intermédiaires, métalumineuses à légèrement peralumineuses. L’âge
U-Pb obtenu par ablation laser ICP-MS du zircon d’un gneiss à sillimanite
du granite-gneiss encaissant des vaugnérites est de 451 ± 9 Ma, révélant
un bâti pré-varisque à protolithe ordovicien supérieur. Les grains
de zircon extraits de quatre vaugnérites donnent des âges U-Pb (±
2s) de 340 ± 2,5 Ma (Ballons), 340 ± 25 Ma, 340 ± 7 Ma et 336 ± 10
Ma (Vosges centrales). Les données de datation des vaugnérites, identiques
aux incertitudes de mesure près, apparaissent donc cohérentes et
révèlent un âge assez précoce dans l’histoire tardi-collisionnelle
de la chaîne. Ces données, en accord avec les âges publiés préalablement
sur ce secteur, montrent que les vaugnérites se mettent en place
au Viséen moyen, au cours d’un événement magmatique majeur, exprimé
tant dans les séries volcano-sédimentaires (Séries OderenMarkstein)
que dans les granitoïdes ultra-potassiques des Vosges méridionales
(Ballons) et centrales (Crêtes). Les études pétrologiques récentes
sur les vaugnérites suggèrent qu’elles dérivent de la fusion partielle
d’un manteau métasomatisé et contaminé à différents degrés par des
éléments de croûte continentale fondue. Nous proposons ici que ce
« pulse » magmatique ultra-potassique d’ampleur à 340– 335 Ma soit
le signe une évolution majeure dans la dynamique de la subduction
de la lithosphère rhénohercynienne sous les Vosges centrales et méridionales.
Sur le modèle d’expériences thermomécaniques récentes simulant le
déroulement d’une collision continentale mature, il pourrait traduire
les premiers effets d’un phénomène de délamination lithosphérique
syn-collisionelle impliquant (1) une subduction continentale relayée
(2) par le sous-charriage d’une lame de croûte inférieure de la marge
continentale avalonienne et (3) l’initiation de la délamination lithosphérique
au sein du prisme orogénique supra-subduction qu’était le bloc continental
saxothüringien-moldanubien. Ce processus conduirait à la mise en
place d’un « upwelling » asthénosphérique, initialement localisé
aux zones de suture varisque et se propageant au cours de la fin
du Carbonifère vers le front sud de la chaîne à mesure de la propagation
du front de délamination à la base de la croûte},
note = {ACLN},
keywords = {ER4},
pubstate = {published},
tppubtype = {article}
}
Datation du zircon de vaugnérites des Vosges centrales et méridionales
: contribution à la géodynamique de l’orogène varisque d’Europe.
Afin d’avancer dans la compréhension de la géodynamique des zones
de suture varisque au stade tardif de la collision (en particulier
au regard de l’évolution du système orogénique en contexte de HT),
nous nous sommes intéressés à la mise en place des vaugnérites, roches
basiques ultra-potassiques intrusives au sein des ensembles granito-gneissiques
de la croûte varisque des Vosges. Ces roches, souvent associées aux
ensembles granitiques tardi-collisionnels, sont de faible extension
mais quasiment toujours présentes au sein de ces systèmes. Elles
affleurent (1) dans les Vosges méridionales, en masses plutoniques
marginales du Granite des Ballons et (2) dans les Vosges centrales
(région de Plainfaing), en filons composites, intrusifs dans un complexe
de migmatites et de roches métamorphiques appelées granite-gneiss.
Les vaugnérites sont des roches mélanocrates à biotite et hornblende
magnésiennes (20 à 40 % vol, 64 < mg# < 78), présentant des signatures
géochimiques caractéristiques de roches ultra-potassiques mafiques
à intermédiaires, métalumineuses à légèrement peralumineuses. L’âge
U-Pb obtenu par ablation laser ICP-MS du zircon d’un gneiss à sillimanite
du granite-gneiss encaissant des vaugnérites est de 451 ± 9 Ma, révélant
un bâti pré-varisque à protolithe ordovicien supérieur. Les grains
de zircon extraits de quatre vaugnérites donnent des âges U-Pb (±
2s) de 340 ± 2,5 Ma (Ballons), 340 ± 25 Ma, 340 ± 7 Ma et 336 ± 10
Ma (Vosges centrales). Les données de datation des vaugnérites, identiques
aux incertitudes de mesure près, apparaissent donc cohérentes et
révèlent un âge assez précoce dans l’histoire tardi-collisionnelle
de la chaîne. Ces données, en accord avec les âges publiés préalablement
sur ce secteur, montrent que les vaugnérites se mettent en place
au Viséen moyen, au cours d’un événement magmatique majeur, exprimé
tant dans les séries volcano-sédimentaires (Séries OderenMarkstein)
que dans les granitoïdes ultra-potassiques des Vosges méridionales
(Ballons) et centrales (Crêtes). Les études pétrologiques récentes
sur les vaugnérites suggèrent qu’elles dérivent de la fusion partielle
d’un manteau métasomatisé et contaminé à différents degrés par des
éléments de croûte continentale fondue. Nous proposons ici que ce
« pulse » magmatique ultra-potassique d’ampleur à 340– 335 Ma soit
le signe une évolution majeure dans la dynamique de la subduction
de la lithosphère rhénohercynienne sous les Vosges centrales et méridionales.
Sur le modèle d’expériences thermomécaniques récentes simulant le
déroulement d’une collision continentale mature, il pourrait traduire
les premiers effets d’un phénomène de délamination lithosphérique
syn-collisionelle impliquant (1) une subduction continentale relayée
(2) par le sous-charriage d’une lame de croûte inférieure de la marge
continentale avalonienne et (3) l’initiation de la délamination lithosphérique
au sein du prisme orogénique supra-subduction qu’était le bloc continental
saxothüringien-moldanubien. Ce processus conduirait à la mise en
place d’un « upwelling » asthénosphérique, initialement localisé
aux zones de suture varisque et se propageant au cours de la fin
du Carbonifère vers le front sud de la chaîne à mesure de la propagation
du front de délamination à la base de la croûte |
2018Conference ER4 Auteurs : Guillot, F; Averbuch, Olivier; Dubois, Michel; Durand, Cyril; Lanari, Pierre; Delangle, C; Gauthier, Arnaud Vaugnérites des Vosges : datations U-Pb sur zircon par LA-ICP-MS et hypothèses génétiques 26ème Réunion des Sciences de la Terre, 22-26 octobre 2018, Lille, 2018, (COM). @conference{Guillot2018,
title = {Vaugnérites des Vosges : datations U-Pb sur zircon par LA-ICP-MS et hypothèses génétiques},
author = {F Guillot and Olivier Averbuch and Michel Dubois and Cyril Durand and Pierre Lanari and C Delangle and Arnaud Gauthier},
year = {2018},
date = {2018-01-01},
booktitle = {26ème Réunion des Sciences de la Terre, 22-26 octobre 2018, Lille},
pages = {530},
note = {COM},
keywords = {ER4},
pubstate = {published},
tppubtype = {conference}
}
|
2017Journal Article ER4 Auteurs : Jeanneret, Pauline; Goncalves, Philippe; Durand, Cyril; Poujol, Marc; Trap, Pierre; Marquer, Didier; Quirt, David; Ledru, Patrick Geochronological constraints on the trans-Hudsonian tectono-metamorphic evolution of the pre-Athabasca basement within the Wollaston-Mudjatik Transition Zone, Saskatchewan In: Precambrian Research, vol. 301, pp. 152-178, 2017, (ACL). Abstract @article{Jeanneret2017,
title = {Geochronological constraints on the trans-Hudsonian tectono-metamorphic evolution of the pre-Athabasca basement within the Wollaston-Mudjatik Transition Zone, Saskatchewan},
author = {Pauline Jeanneret and Philippe Goncalves and Cyril Durand and Marc Poujol and Pierre Trap and Didier Marquer and David Quirt and Patrick Ledru},
year = {2017},
date = {2017-01-01},
journal = {Precambrian Research},
volume = {301},
pages = {152-178},
abstract = {The hudsonian pressure-temperature-deformation-time-(p-t-d-t) evolution of the pre-athabasca crystalline basement (>∼1700 ma) of the wollaston-mudjatik transition zone (wmtz) highlights two major tectono-metamorphic events m1-d1 and m2-d2. the ages of these two event have been obtained by in-situ la-icpms u-th-pb dating of monazite from grt-crd bearing pelitic gneiss and u-pb analyses performed on zircons from pegmatites, using both exposed basement and drill cores from the wolly–mcclean exploration drilling project. the m1-d1 event, interpreted as the burial of the thinned hearne margin via southward thrusting to pressures varying from 10 to 6 kbar, occurred between ca.1840 and 1813 ma. the m2-d2 event, producing the northeast structural trend of the wmtz, was formed in a sinistral transpressional tectonic regime during the late stage of the hudsonian oblique collision between ca. 1813 and 1770 ma. thermobarometric estimates on the m2–d2 assemblages show that the entire studied area was reequilibrated at about 5 kbar and 750–825 °c. trans-hudsonian pegmatites are viewed as the main proto-ore of the uranium-rich athabasca unconformity-type deposits. formation, transfer and differentiation of these trans-hudsonian pegmatites are replaced in this p-t-d-t evolution. during the 1840–1813 ma m1-d1 partial melting event, the first batches of melt produced in the deep crust are the most likely enriched in uranium. then, these melts were transferred upwards to the upper crustal levels owing to the development of crustal scale steeply-dipping d2 shear zones, and finally were differentiated to form uranium-enriched pegmatites between 1813 and 1770 ma. some monazite and zircon grains within retrogressed migmatites recorded a later event at ca. 1720 ma, interpreted as the terminal cooling event down to 300–400 °c responsible for partial retrogression of metamorphic assemblages. this age provides new insights into the timing of the onset of the athabasca sedimentation that should therefore be at least 1710 ma old or younger.},
note = {ACL},
keywords = {ER4},
pubstate = {published},
tppubtype = {article}
}
The hudsonian pressure-temperature-deformation-time-(p-t-d-t) evolution of the pre-athabasca crystalline basement (>∼1700 ma) of the wollaston-mudjatik transition zone (wmtz) highlights two major tectono-metamorphic events m1-d1 and m2-d2. the ages of these two event have been obtained by in-situ la-icpms u-th-pb dating of monazite from grt-crd bearing pelitic gneiss and u-pb analyses performed on zircons from pegmatites, using both exposed basement and drill cores from the wolly–mcclean exploration drilling project. the m1-d1 event, interpreted as the burial of the thinned hearne margin via southward thrusting to pressures varying from 10 to 6 kbar, occurred between ca.1840 and 1813 ma. the m2-d2 event, producing the northeast structural trend of the wmtz, was formed in a sinistral transpressional tectonic regime during the late stage of the hudsonian oblique collision between ca. 1813 and 1770 ma. thermobarometric estimates on the m2–d2 assemblages show that the entire studied area was reequilibrated at about 5 kbar and 750–825 °c. trans-hudsonian pegmatites are viewed as the main proto-ore of the uranium-rich athabasca unconformity-type deposits. formation, transfer and differentiation of these trans-hudsonian pegmatites are replaced in this p-t-d-t evolution. during the 1840–1813 ma m1-d1 partial melting event, the first batches of melt produced in the deep crust are the most likely enriched in uranium. then, these melts were transferred upwards to the upper crustal levels owing to the development of crustal scale steeply-dipping d2 shear zones, and finally were differentiated to form uranium-enriched pegmatites between 1813 and 1770 ma. some monazite and zircon grains within retrogressed migmatites recorded a later event at ca. 1720 ma, interpreted as the terminal cooling event down to 300–400 °c responsible for partial retrogression of metamorphic assemblages. this age provides new insights into the timing of the onset of the athabasca sedimentation that should therefore be at least 1710 ma old or younger. |
2016Journal Article ER4 Auteurs : Eglinger, Aurélien; Vanderhaeghe, Olivier; André-Mayer, Anne-Sylvie; Goncalves, Philippe; Zeh, Armin; Durand, Cyril; Deloule, Etienne Tectono-metamorphic evolution of the internal zone of the Pan-African Lufilian orogenic belt (Zambia): Implications for crustal reworking and syn-orogenic uranium mineralizations In: Lithos, vol. 240-243, pp. 167-188, 2016, (ACL). Abstract @article{Eglinger2016,
title = {Tectono-metamorphic evolution of the internal zone of the Pan-African Lufilian orogenic belt (Zambia): Implications for crustal reworking and syn-orogenic uranium mineralizations},
author = {Aurélien Eglinger and Olivier Vanderhaeghe and Anne-Sylvie André-Mayer and Philippe Goncalves and Armin Zeh and Cyril Durand and Etienne Deloule},
year = {2016},
date = {2016-01-01},
journal = {Lithos},
volume = {240-243},
pages = {167-188},
abstract = {The internal zone of the pan-african lufilian orogenic belt (zambia) hosts a dozen uranium occurrences mostly located within kyanite micaschists in a shear zone marking the contact between metasedimentary rocks attributed to the katanga neoproterozoic sedimentary sequence and migmatites coring domes developed dominantly at the expense of the pre-neoproterozoic basement. the p–t–t–d paths reconstructed for these rocks combining field observations, microstructural analysis, metamorphic petrology and thermobarometry and geochronology indicate that they have recorded burial and exhumation during the pan-african orogeny. both units of the katanga metasedimentary sequence and pre-katanga migmatitic basement have underwent minimum peak p–t conditions of ~ 9–11 kbar and ~ 640–660 °c, dated at ca. 530 ma by garnet-whole rock lu–hf isochrons. this suggests that this entire continental segment has been buried up to a depth of 40–50 km with geothermal gradients of 15–20 °c.km− 1 during the pan-african orogeny and the formation of the west gondwana supercontinent. syn-orogenic exhumation of the partially molten root of the lufilian belt is attested by isothermal decompression under p–t conditions of ~ 6–8 kbar at ca. 530–500 ma, witnessing an increase of the geothermal gradients to 25–30 °c·km− 1. uranium mineralizations that consist of uraninite and brannerite took place at temperatures ranging from ~ 600 to 700 °c, and have been dated at ca. 540–530 ma by u–pb ages on uraninite. the main uranium deposition thus occurred at the transition from the syn-orogenic burial to the syn-orogenic exhumation stages and has been then partially transposed and locally remobilized during the post-orogenic exhumation accommodated by activation of low-angle extensional detachment.},
note = {ACL},
keywords = {ER4},
pubstate = {published},
tppubtype = {article}
}
The internal zone of the pan-african lufilian orogenic belt (zambia) hosts a dozen uranium occurrences mostly located within kyanite micaschists in a shear zone marking the contact between metasedimentary rocks attributed to the katanga neoproterozoic sedimentary sequence and migmatites coring domes developed dominantly at the expense of the pre-neoproterozoic basement. the p–t–t–d paths reconstructed for these rocks combining field observations, microstructural analysis, metamorphic petrology and thermobarometry and geochronology indicate that they have recorded burial and exhumation during the pan-african orogeny. both units of the katanga metasedimentary sequence and pre-katanga migmatitic basement have underwent minimum peak p–t conditions of ~ 9–11 kbar and ~ 640–660 °c, dated at ca. 530 ma by garnet-whole rock lu–hf isochrons. this suggests that this entire continental segment has been buried up to a depth of 40–50 km with geothermal gradients of 15–20 °c.km− 1 during the pan-african orogeny and the formation of the west gondwana supercontinent. syn-orogenic exhumation of the partially molten root of the lufilian belt is attested by isothermal decompression under p–t conditions of ~ 6–8 kbar at ca. 530–500 ma, witnessing an increase of the geothermal gradients to 25–30 °c·km− 1. uranium mineralizations that consist of uraninite and brannerite took place at temperatures ranging from ~ 600 to 700 °c, and have been dated at ca. 540–530 ma by u–pb ages on uraninite. the main uranium deposition thus occurred at the transition from the syn-orogenic burial to the syn-orogenic exhumation stages and has been then partially transposed and locally remobilized during the post-orogenic exhumation accommodated by activation of low-angle extensional detachment. |
2016Journal Article ER4 Auteurs : Goncalves, Philippe; Durand, Cyril Rôle des fluides sur le métamorphisme In: Géochronique, vol. 136, pp. 75-80, 2016, (ACLN). @article{Goncalves2016,
title = {Rôle des fluides sur le métamorphisme},
author = {Philippe Goncalves and Cyril Durand},
year = {2016},
date = {2016-01-01},
journal = {Géochronique},
volume = {136},
pages = {75-80},
note = {ACLN},
keywords = {ER4},
pubstate = {published},
tppubtype = {article}
}
|
2016Journal Article ER4 Auteurs : Jeanneret, Pauline; Goncalves, Philippe; Durand, Cyril; Trap, Pierre; Marquer, Didier; Quirt, David; Ledru, Patrick Tectono-metamorphic evolution of the pre-Athabasca basement within the Wollaston-Mudjatik Transition Zone, Saskatchewan In: Revue Canadienne des Sciences de la Terre, vol. 53, no. 3, pp. 231-259, 2016, (ACL). Abstract @article{Jeanneret2016,
title = {Tectono-metamorphic evolution of the pre-Athabasca basement within the Wollaston-Mudjatik Transition Zone, Saskatchewan},
author = {Pauline Jeanneret and Philippe Goncalves and Cyril Durand and Pierre Trap and Didier Marquer and David Quirt and Patrick Ledru},
year = {2016},
date = {2016-01-01},
journal = {Revue Canadienne des Sciences de la Terre},
volume = {53},
number = {3},
pages = {231-259},
abstract = {L’évolution tectono-métamorphique paléoprotérozoique du socle pré-athabasca (∼1.7 ga) de la zone de transition mudjatik–wollaston (ztmw) (saskatchewan) a été définie à partir du socle affleurant et des forages du projet wolly–mcclean. le champ de déformation finie ductile résulte de la superposition de deux évènements tectono-métamorphique m1–d1 et m2–d2. m1–d1 est associé au développement d’une foliation peu inclinée orientée n90°–n100° et à un pic de pression décroissant vers le sud avec plus de 10 kbar (1 kbar = 100 mpa) à la rivière cochrane, jusqu’à 6 kbar dans la zone de forage du projet wolly–mcclean. l’évènement m2–d2 est responsable de la structuration majeure nord-est de la ztmw qui s’est développée dans un régime transpressif senestre au cours de la phase finale de la collision oblique trans-hudsonienne. les estimations thermobarométriques sur les assemblages m2–d2 mettent en évidence un rééquilibrage à 4–5 kbar et 750–825 °c. le socle a donc été affecté entre d1 et d2 par un épisode de décompression isotherme, ramenant au même niveau structural, la partie nord-est la plus profonde de la zone d’étude et la zone de forage wolly–mcclean. ces résultats suggèrent que le socle affleurant au nord-est du bassin de l’athabasca n’est pas l’analogue du socle situé sous le bassin là où les enrichissements en uranium sont connus. nous suggérons également que les liquides silicatés enrichis en uranium, et produits au cours de l’épisode de fusion partielle m1–d1 dans la croute profonde, ont été transférés dans la croute moyenne, par le biais des zones de cisaillement d2, et différenciés pour former les pegmatites enrichies en uranium.},
note = {ACL},
keywords = {ER4},
pubstate = {published},
tppubtype = {article}
}
L’évolution tectono-métamorphique paléoprotérozoique du socle pré-athabasca (∼1.7 ga) de la zone de transition mudjatik–wollaston (ztmw) (saskatchewan) a été définie à partir du socle affleurant et des forages du projet wolly–mcclean. le champ de déformation finie ductile résulte de la superposition de deux évènements tectono-métamorphique m1–d1 et m2–d2. m1–d1 est associé au développement d’une foliation peu inclinée orientée n90°–n100° et à un pic de pression décroissant vers le sud avec plus de 10 kbar (1 kbar = 100 mpa) à la rivière cochrane, jusqu’à 6 kbar dans la zone de forage du projet wolly–mcclean. l’évènement m2–d2 est responsable de la structuration majeure nord-est de la ztmw qui s’est développée dans un régime transpressif senestre au cours de la phase finale de la collision oblique trans-hudsonienne. les estimations thermobarométriques sur les assemblages m2–d2 mettent en évidence un rééquilibrage à 4–5 kbar et 750–825 °c. le socle a donc été affecté entre d1 et d2 par un épisode de décompression isotherme, ramenant au même niveau structural, la partie nord-est la plus profonde de la zone d’étude et la zone de forage wolly–mcclean. ces résultats suggèrent que le socle affleurant au nord-est du bassin de l’athabasca n’est pas l’analogue du socle situé sous le bassin là où les enrichissements en uranium sont connus. nous suggérons également que les liquides silicatés enrichis en uranium, et produits au cours de l’épisode de fusion partielle m1–d1 dans la croute profonde, ont été transférés dans la croute moyenne, par le biais des zones de cisaillement d2, et différenciés pour former les pegmatites enrichies en uranium. |
2015Journal Article ER4 Auteurs : Durand, Cyril; Baumgartner, Lukas-P.; Marquer, Didier Low melting temperature for calcite at 1000 bars on the join CaCO3-H2O – some geological implications In: Terra Nova, vol. 27, no. 5, pp. 364-369, 2015, (ACL). Abstract @article{Durand2015,
title = {Low melting temperature for calcite at 1000 bars on the join CaCO3-H2O – some geological implications},
author = {Cyril Durand and Lukas-P. Baumgartner and Didier Marquer},
year = {2015},
date = {2015-01-01},
journal = {Terra Nova},
volume = {27},
number = {5},
pages = {364-369},
abstract = {Melting experiments of calcite were performed on the join caco3-h2o at a pressure of 1000 bars. the system evolves to the ternary cao-h2o-co2 system during melting experiments. our experiments show that partial melting of calcite begins at a low temperature, below 650 °c. such a low partial melting temperature for carbonates revives the debate about the presence of carbonate melts in the upper crust. more specifically, the conditions for carbonate partial melting are present in carbonate host rocks undergoing contact metamorphism at high temperatures in the presence of water-rich fluid. the presence of carbonate melts influences physical parameters such as viscosity and permeability in contact aureoles, and, furthermore, decarbonation reactions release massive amounts of co2.},
note = {ACL},
keywords = {ER4},
pubstate = {published},
tppubtype = {article}
}
Melting experiments of calcite were performed on the join caco3-h2o at a pressure of 1000 bars. the system evolves to the ternary cao-h2o-co2 system during melting experiments. our experiments show that partial melting of calcite begins at a low temperature, below 650 °c. such a low partial melting temperature for carbonates revives the debate about the presence of carbonate melts in the upper crust. more specifically, the conditions for carbonate partial melting are present in carbonate host rocks undergoing contact metamorphism at high temperatures in the presence of water-rich fluid. the presence of carbonate melts influences physical parameters such as viscosity and permeability in contact aureoles, and, furthermore, decarbonation reactions release massive amounts of co2. |
2015Journal Article ER4 Auteurs : Durand, Cyril; Oliot, Emilien; Marquer, Didier; Sizun, Jean-Pierre Chemical mass transfer in shear zones and metacarbonate xenoliths: a comparison of four mass balance approaches In: European Journal of Mineralogy, vol. 27, no. 6, pp. 731-754, 2015, (ACL). Abstract @article{Durand2015a,
title = {Chemical mass transfer in shear zones and metacarbonate xenoliths: a comparison of four mass balance approaches},
author = {Cyril Durand and Emilien Oliot and Didier Marquer and Jean-Pierre Sizun},
year = {2015},
date = {2015-01-01},
journal = {European Journal of Mineralogy},
volume = {27},
number = {6},
pages = {731-754},
abstract = {Mass balance calculations have been performed through a comparison of published graphical and statistical approaches applied to two contrasted geological settings: (i) the development of a greenschist-facies ductile shear-zone that recorded a weak volume change but significant mass transfers, and (ii) the formation of exoskarns in metacarbonate xenoliths that recorded a large volume decrease related to huge mass transfers. the comparison of the four mass-balance approaches shows that, if uncertainties are ignored, (1) they yield similar results concerning the mobile vs immobile behaviour of many components; (2) they yield similar mass-change values on bulk rock and on individual chemical elements (bulk-rock mass-change values differ by a maximum of ca. 15% between graphical and statistical treatments of the metacarbonate xenolith evolution). the main difference concerns the uncertainties on mass changes (for bulk rocks and individual elements), which are much larger with the graphical than with the statistical approaches when uncertainties on chemical elements are taken into account, as they should be. the main advantage of the graphical methods is their rapid implementation and the clarity of the diagrams. their main disadvantages are that uncertainties on each chemical element and bulk compositions are not taken into account and the difficulty in choosing an accurate immobility field to precisely define errors. graphical methods need to be completed by a statistical treatment that gives absolute mass transfer results. the statistical approaches have the advantage of taking into account the chemical heterogeneities of the compared populations, in conjunction to a precise data treatment. the statistical treatment is an important and necessary step to decipher and to be pertinent in interpreting mobility/immobility of chemical elements, and, thus, in the absolute quantification of mass and volume changes},
note = {ACL},
keywords = {ER4},
pubstate = {published},
tppubtype = {article}
}
Mass balance calculations have been performed through a comparison of published graphical and statistical approaches applied to two contrasted geological settings: (i) the development of a greenschist-facies ductile shear-zone that recorded a weak volume change but significant mass transfers, and (ii) the formation of exoskarns in metacarbonate xenoliths that recorded a large volume decrease related to huge mass transfers. the comparison of the four mass-balance approaches shows that, if uncertainties are ignored, (1) they yield similar results concerning the mobile vs immobile behaviour of many components; (2) they yield similar mass-change values on bulk rock and on individual chemical elements (bulk-rock mass-change values differ by a maximum of ca. 15% between graphical and statistical treatments of the metacarbonate xenolith evolution). the main difference concerns the uncertainties on mass changes (for bulk rocks and individual elements), which are much larger with the graphical than with the statistical approaches when uncertainties on chemical elements are taken into account, as they should be. the main advantage of the graphical methods is their rapid implementation and the clarity of the diagrams. their main disadvantages are that uncertainties on each chemical element and bulk compositions are not taken into account and the difficulty in choosing an accurate immobility field to precisely define errors. graphical methods need to be completed by a statistical treatment that gives absolute mass transfer results. the statistical approaches have the advantage of taking into account the chemical heterogeneities of the compared populations, in conjunction to a precise data treatment. the statistical treatment is an important and necessary step to decipher and to be pertinent in interpreting mobility/immobility of chemical elements, and, thus, in the absolute quantification of mass and volume changes |
2015Conference ER4 Auteurs : Masson, Eric; Akmalov, Shamshod; Blanpain, Olivier; Litot, Jean-Baptiste; Melin, Hélène; Dos-Santos, Antonio; Durand, Cyril; Leprêtre, Alain; Pernin, Céline; Burrow, Coralie; Détriché, Sébastien; Douay, Francis; Leclercq-Dransart, Julie Environnements numériques de l’image – Images numériques de l’environnement 4e journées Big Data Mining and Visualization, 18-19 juin 2015, Lyon, 2015, (ACTN). @conference{Masson2015,
title = {Environnements numériques de l’image – Images numériques de l’environnement},
author = {Eric Masson and Shamshod Akmalov and Olivier Blanpain and Jean-Baptiste Litot and Hélène Melin and Antonio Dos-Santos and Cyril Durand and Alain Leprêtre and Céline Pernin and Coralie Burrow and Sébastien Détriché and Francis Douay and Julie Leclercq-Dransart},
year = {2015},
date = {2015-01-01},
booktitle = {4e journées Big Data Mining and Visualization, 18-19 juin 2015, Lyon},
note = {ACTN},
keywords = {ER4},
pubstate = {published},
tppubtype = {conference}
}
|
2014Conference ER4 Auteurs : Durand, Cyril; Dubois, Michel; Ventalon, Sandra; Trap, Pierre; Goncalves, Philippe; Marquer, Didier Nature des fluides et circulations fluides associés au développement d’un endoskarn uranifère (District de Cage, Québec) Réunion des Sciences de la Terre, 27-31 octobre 2014, Pau, 2014, (ACTN). @conference{Durand2014,
title = {Nature des fluides et circulations fluides associés au développement d’un endoskarn uranifère (District de Cage, Québec)},
author = {Cyril Durand and Michel Dubois and Sandra Ventalon and Pierre Trap and Philippe Goncalves and Didier Marquer},
year = {2014},
date = {2014-01-01},
booktitle = {Réunion des Sciences de la Terre, 27-31 octobre 2014, Pau},
note = {ACTN},
keywords = {ER4},
pubstate = {published},
tppubtype = {conference}
}
|
2014Journal Article ER4 Auteurs : Eglinger, Aurélien; Tarantola, Alexandre; Durand, Cyril; Ferraina, Clément; Vanderhaeghe, Olivier; André-Mayer, Anne-Sylvie; Paquette, Jean-Louis; Deloule, Etienne Uranium mobilization by fluids associated with Ca–Na metasomatism: A P–T–t record of fluid–rock interactions during Pan-African metamorphism (Western Zambian Copperbelt) In: Chemical Geology, vol. 386, pp. 218-237, 2014, (ACL). Abstract @article{Eglinger2014,
title = {Uranium mobilization by fluids associated with Ca–Na metasomatism: A P–T–t record of fluid–rock interactions during Pan-African metamorphism (Western Zambian Copperbelt)},
author = {Aurélien Eglinger and Alexandre Tarantola and Cyril Durand and Clément Ferraina and Olivier Vanderhaeghe and Anne-Sylvie André-Mayer and Jean-Louis Paquette and Etienne Deloule},
year = {2014},
date = {2014-01-01},
journal = {Chemical Geology},
volume = {386},
pages = {218-237},
abstract = {A dozen uranium occurrences are known in the western zambian copperbelt (domes region, zambia). the host-rocks, neoproterozoic kyanite ± talc micaschists, have been interpreted as meta-evaporites that formed part of an epicontinental sequence affected by upper amphibolite metamorphism during the pan-african orogeny. ca–na metasomatism, expressed by the presence of apatite, epidote and scapolite, is regionally extensive in the katanga and the pre-katanga rocks in the domes region. the present study focuses on the solwezi dome in the western zambian copperbelt. two distinct uranium mineralization events that took place here mark the transition from crustal-thickening by tectonic accretion to exhumation of the metamorphic host rocks. u–pb dating of uraninite and th–pb dating of monazite show that the first u-mineralization event took place between ~ 550 ma and ~ 530 ma. the event is therefore contemporaneous with crustal thickening and, on the basis of fluid inclusion analyses, can be related to circulation of hypersaline ca-rich metamorphic fluids trapped at minimum p–t conditions of 460 mpa and 500 °c. on a regional scale, the event is related to an epidote–apatite metasomatic assemblage. the second mineralization event, dated at between ~ 510 and ~ 500 ma by th–pb dating of monazite, is related to high-salinity ca–na-rich metamorphic fluids and occurred during exhumation of the high-grade metamorphic rocks. these fluids were trapped at the ductile/brittle transition at 150 to 260 mpa and 200 to 300 °c. a regional-scale scapolitization is attributed to these late fluid circulations. these fluid–rock interactions, described at the regional scale, are also characterized at the mineral scale. alteration reactions, assisted by cacl2-rich fluids, indicate that monazite and allanite hosted by the pre-katanga rocks potentially acted as u sources for these pan-african synmetamorphic uranium mineralizations.},
note = {ACL},
keywords = {ER4},
pubstate = {published},
tppubtype = {article}
}
A dozen uranium occurrences are known in the western zambian copperbelt (domes region, zambia). the host-rocks, neoproterozoic kyanite ± talc micaschists, have been interpreted as meta-evaporites that formed part of an epicontinental sequence affected by upper amphibolite metamorphism during the pan-african orogeny. ca–na metasomatism, expressed by the presence of apatite, epidote and scapolite, is regionally extensive in the katanga and the pre-katanga rocks in the domes region. the present study focuses on the solwezi dome in the western zambian copperbelt. two distinct uranium mineralization events that took place here mark the transition from crustal-thickening by tectonic accretion to exhumation of the metamorphic host rocks. u–pb dating of uraninite and th–pb dating of monazite show that the first u-mineralization event took place between ~ 550 ma and ~ 530 ma. the event is therefore contemporaneous with crustal thickening and, on the basis of fluid inclusion analyses, can be related to circulation of hypersaline ca-rich metamorphic fluids trapped at minimum p–t conditions of 460 mpa and 500 °c. on a regional scale, the event is related to an epidote–apatite metasomatic assemblage. the second mineralization event, dated at between ~ 510 and ~ 500 ma by th–pb dating of monazite, is related to high-salinity ca–na-rich metamorphic fluids and occurred during exhumation of the high-grade metamorphic rocks. these fluids were trapped at the ductile/brittle transition at 150 to 260 mpa and 200 to 300 °c. a regional-scale scapolitization is attributed to these late fluid circulations. these fluid–rock interactions, described at the regional scale, are also characterized at the mineral scale. alteration reactions, assisted by cacl2-rich fluids, indicate that monazite and allanite hosted by the pre-katanga rocks potentially acted as u sources for these pan-african synmetamorphic uranium mineralizations. |
2013Book ER4 Auteurs : Goncalves, Philippe; Marquer, Didier; Oliot, Emilien; Durand, Cyril Thermodynamic Modeling and Thermobarometry of Metasomatized Rocks 2013, (OS). Abstract @book{Goncalves2013,
title = {Thermodynamic Modeling and Thermobarometry of Metasomatized Rocks},
author = {Philippe Goncalves and Didier Marquer and Emilien Oliot and Cyril Durand},
year = {2013},
date = {2013-01-01},
booktitle = {in "Metasomatism and the Chemical Transformation of Rock"},
volume = {pp 53-91, Springer},
abstract = {Determining the p-t conditions at which metasomatism occurs provides insight into the physical conditions at which fluid-rock interaction occurs in the crust. however, application of thermodynamic modeling to metasomatized rocks is not without pitfalls. as with “normal” metamorphic rocks, the main difficulty is to select mineral compositions that were in equilibrium during their crystallization. this essential task is particularly difficult in metasomatized rocks because it is often difficult to distinguish textures produced by changes in p-t conditions from those caused by fluid-rock interactions and associated changes in bulk composition. furthermore, the selection of minerals in equilibrium in metasomatized rocks is made difficult by the great variability of scale of mass transfer (see chaps. 4 and 5), and therefore equilibrium, which varies from micrometer- to hand-sample or larger scale, depending on the amount of fluid involved and the fluid transport mechanisms (e.g. pervasive or focused). finally, another major limitation that is discussed in detail in chap. 5, is that fluid composition coming in or out of the rock is unknown. since fluid is a major phase component of the system, neglecting its impact on the phase relations might be problematic for thermobarometry. despite these pitfalls, we describe in this contribution examples where thermobarometry has been apparently successfully applied. we emphasize that pseudosection thermobarometry is particularly suitable for metasomatized rocks because the effects of mass transfer can be explored through p-t-x phase diagrams. application of thermodynamic modeling to metasomatized rocks requires (1) detailed mineralogical and textural investigation to select appropriate mineral compositions, (2) essential geochemical analyses to define the relative and absolute mass changes involved during the metasomatic event(s), and (3) forward modeling of the effects of mass transfer on phase relations.},
note = {OS},
keywords = {ER4},
pubstate = {published},
tppubtype = {book}
}
Determining the p-t conditions at which metasomatism occurs provides insight into the physical conditions at which fluid-rock interaction occurs in the crust. however, application of thermodynamic modeling to metasomatized rocks is not without pitfalls. as with “normal” metamorphic rocks, the main difficulty is to select mineral compositions that were in equilibrium during their crystallization. this essential task is particularly difficult in metasomatized rocks because it is often difficult to distinguish textures produced by changes in p-t conditions from those caused by fluid-rock interactions and associated changes in bulk composition. furthermore, the selection of minerals in equilibrium in metasomatized rocks is made difficult by the great variability of scale of mass transfer (see chaps. 4 and 5), and therefore equilibrium, which varies from micrometer- to hand-sample or larger scale, depending on the amount of fluid involved and the fluid transport mechanisms (e.g. pervasive or focused). finally, another major limitation that is discussed in detail in chap. 5, is that fluid composition coming in or out of the rock is unknown. since fluid is a major phase component of the system, neglecting its impact on the phase relations might be problematic for thermobarometry. despite these pitfalls, we describe in this contribution examples where thermobarometry has been apparently successfully applied. we emphasize that pseudosection thermobarometry is particularly suitable for metasomatized rocks because the effects of mass transfer can be explored through p-t-x phase diagrams. application of thermodynamic modeling to metasomatized rocks requires (1) detailed mineralogical and textural investigation to select appropriate mineral compositions, (2) essential geochemical analyses to define the relative and absolute mass changes involved during the metasomatic event(s), and (3) forward modeling of the effects of mass transfer on phase relations. |
