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Archive | 2013

Thermodynamic Modeling and Thermobarometry of Metasomatized Rocks

Philippe Goncalves; Didier Marquer; Emilien Oliot; Cyril Durand

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.


Chemical Geology | 2014

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)

Aurélien Eglinger; Alexandre Tarantola; Cyril Durand; Clément Ferraina; Olivier Vanderhaeghe; Anne-Sylvie André-Mayer; Jean-Louis Paquette; Etienne Deloule


Lithos | 2016

Tectono-metamorphic evolution of the internal zone of the Pan-African Lufilian orogenic belt (Zambia): Implications for crustal reworking and syn-orogenic uranium mineralizations

Aurélien Eglinger; Olivier Vanderhaeghe; Anne-Sylvie André-Mayer; Philippe Goncalves; Armin Zeh; Cyril Durand; Etienne Deloule


Canadian Journal of Earth Sciences | 2016

Tectono-metamorphic evolution of the pre-Athabasca basement within the Wollaston–Mudjatik Transition Zone, Saskatchewan

Pauline Jeanneret; Philippe Goncalves; Cyril Durand; Pierre Trap; Didier Marquer; David Quirt; Patrick Ledru


European Journal of Mineralogy | 2015

Chemical mass transfer in shear zones and metacarbonate xenoliths: a comparison of four mass balance approaches

Cyril Durand; Emilien Oliot; Didier Marquer; Jean Pierre Sizun


Terra Nova | 2015

Low melting temperature for calcite at 1000 bars on the join CaCO3-H2O – some geological implications

Cyril Durand; Lukas P. Baumgartner; Didier Marquer


Precambrian Research | 2017

Geochronological constraints on the trans-Hudsonian tectono-metamorphic evolution of the pre-Athabasca basement within the Wollaston-Mudjatik Transition Zone, Saskatchewan

Pauline Jeanneret; Philippe Goncalves; Cyril Durand; Marc Poujol; Pierre Trap; Didier Marquer; David Quirt; Patrick Ledru


Archive | 2008

Experimentally major and trace partitioning between calcitic melt and calcite at 1000 bars

Cyril Durand; Lukas P. Baumgartner


24 ème Réunion des sciences de la Terre 2014 | 2014

Évolution tectono-métamorphiquepré-Athabasca de la zone de transitionWollaston-Mudjatik (Saskatchewan, CANADA): implication sur les transferts del’uranium

Pauline Jeanneret; Philippe Goncalves; Cyril Durand; Pierre Trap; Marc Poujol


Archive | 2009

Passive concentration of REE during skarn formation: Example from the Quérigut Massif (Pyrenees, France)

Cyril Durand; Didier Marquer; Etienne Deloule

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Didier Marquer

University of Franche-Comté

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Pierre Trap

University of Franche-Comté

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Emilien Oliot

University of Strasbourg

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