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Yevgeny Vapnik - One of the best experts on this subject based on the ideXlab platform.
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deformation character and palaeo fluid flow across a Wrench Fault within a palaeozoic subduction accretion system waratah Fault zone southeastern australia
Journal of Structural Geology, 1999Co-Authors: David R Gray, Christoph Janssen, Yevgeny VapnikAbstract:Abstract Melange formation, cataclasis, meso- to micro-scale Faulting, and veining reflect Faulting processes within turbidite and limestone sequences juxtaposed along a steeply dipping, sinistral Wrench-Fault zone in the Lachlan Orogen, southeastern Australia. Fault damage occurs across a zone up to 600 m wide. Effects of Faulting in the turbidites are shown by a 100–150 m wide zone of scaly mudstone-matrix melange, mud-injection `dykes' and veinlets, and refolding of melange fabrics, with minor subsidiary brittle-Faulting and cataclasis extending up to 500 m from the major Fault plane. Veining and cataclastic zones occur in the limestone and are most pronounced up to 100 m from the main brittle Fault. Fluid inclusion data from quartz and calcite veins suggest Faulting took place at temperatures between 160 and 200°C, whereas folding is inferred to have taken place at temperatures above 300°C. Fluid-assisted, Fault zone `weakening' mechanisms (pressure solution/solution transfer) were active over the whole Fault zone. Veining, characteristic of fluid-assisted Fault zone `strengthening' processes (i.e. rock-mass cementation), is confined to the limestone sequence. Here, calcite precipation led to Fault rocks with lower porosity and permeability than in the turbidite sequence. Overprinting between different veins and fractures, and zonation in vein cement suggest cyclic deformation and fluid flow. The repeated change between brittle fracturing and veining/cementation led to a combined conduit–barrier system in the limestone sequence, whereas the melange zone in the turbidites acted as a fluid conduit only.
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Deformation character and palaeo-fluid flow across a Wrench Fault within a Palaeozoic subduction–accretion system: Waratah Fault Zone, southeastern Australia
Journal of Structural Geology, 1999Co-Authors: David R Gray, Christoph Janssen, Yevgeny VapnikAbstract:Abstract Melange formation, cataclasis, meso- to micro-scale Faulting, and veining reflect Faulting processes within turbidite and limestone sequences juxtaposed along a steeply dipping, sinistral Wrench-Fault zone in the Lachlan Orogen, southeastern Australia. Fault damage occurs across a zone up to 600 m wide. Effects of Faulting in the turbidites are shown by a 100–150 m wide zone of scaly mudstone-matrix melange, mud-injection `dykes' and veinlets, and refolding of melange fabrics, with minor subsidiary brittle-Faulting and cataclasis extending up to 500 m from the major Fault plane. Veining and cataclastic zones occur in the limestone and are most pronounced up to 100 m from the main brittle Fault. Fluid inclusion data from quartz and calcite veins suggest Faulting took place at temperatures between 160 and 200°C, whereas folding is inferred to have taken place at temperatures above 300°C. Fluid-assisted, Fault zone `weakening' mechanisms (pressure solution/solution transfer) were active over the whole Fault zone. Veining, characteristic of fluid-assisted Fault zone `strengthening' processes (i.e. rock-mass cementation), is confined to the limestone sequence. Here, calcite precipation led to Fault rocks with lower porosity and permeability than in the turbidite sequence. Overprinting between different veins and fractures, and zonation in vein cement suggest cyclic deformation and fluid flow. The repeated change between brittle fracturing and veining/cementation led to a combined conduit–barrier system in the limestone sequence, whereas the melange zone in the turbidites acted as a fluid conduit only.
C. Ballouard - One of the best experts on this subject based on the ideXlab platform.
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Uranium metallogenesis of the peraluminous leucogranite from the Pontivy-Rostrenen magmatic complex (French Armorican Variscan belt): the result of long-term oxidized hydrothermal alteration during strike-slip deformation
Mineralium Deposita, 2018Co-Authors: C. Ballouard, M. Poujol, J. Mercadier, E. Deloule, P. Boulvais, J. M. Baele, M. Cuney, M. CathelineauAbstract:In the French Armorican Variscan belt, most of the economically significant hydrothermal U deposits are spatially associated with peraluminous leucogranites emplaced along the south Armorican shear zone (SASZ), a dextral lithospheric scale Wrench Fault that recorded ductile deformation from ca. 315 to 300 Ma. In the Pontivy-Rostrenen complex, a composite intrusion, the U mineralization is spatially associated with brittle structures related to deformation along the SASZ. In contrast to monzogranite and quartz monzodiorite (3
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Uranium metallogenesis of the peraluminous leucogranite from the Pontivy-Rostrenen magmatic complex (French Armorican Variscan belt): the result of long-term oxidized hydrothermal alteration during strike-slip deformation
Mineralium Deposita, 2018Co-Authors: C. Ballouard, M. Poujol, J. Mercadier, E. Deloule, P. Boulvais, M. Cuney, M. Cathelineau, J. M. BaeleAbstract:In the French Armorican Variscan belt, most of theeconomically significant hydrothermal U deposits are spatiallyassociated with peraluminous leucogranites emplacedalong the south Armorican shear zone (SASZ), a dextral lithosphericscale Wrench Fault that recorded ductile deformationfrom ca. 315 to 300 Ma. In the Pontivy-Rostrenen complex, acomposite intrusion, the U mineralization is spatially associatedwith brittle structures related to deformation along theSASZ. In contrast to monzogranite and quartz monzodiorite(3 < U < 9 ppm; Th/U > 3), the leucogranite samples arecharacterized by highly variable U contents (~ 3 to 27 ppm)and Th/U ratios (~ 0.1 to 5) suggesting that the crystallizationof magmatic uranium oxide in the more evolved facies wasfollowed by uranium oxide leaching during hydrothermal alterationand/or surface weathering. U-Pb dating of uraniumoxides from the deposits reveals that they mostly formed betweenca. 300 and 270 Ma. In monzogranite and quartzmonzodiorite, apatite grains display magmatic textures andprovide U-Pb ages of ca. 315 Ma reflecting the time of emplacementof the intrusions. In contrast, apatite grains from theleucogranite display textural, geochemical, and geochronologicalevidences for interaction with U-rich oxidized hydrothermalfluids contemporaneously with U mineralizingevents. From 300 to 270 Ma, infiltration of surface-derivedoxidized fluids leached magmatic uranium oxide from fertileleucogranite and formed U deposits. This phenomenon wassustained by brittle deformation and by the persistence ofthermal anomalies associated with U-rich granitic bodies.
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Multiple crust reworking in the French Armorican Variscan belt: implication for the genesis of uranium-fertile leucogranites
International Journal of Earth Sciences, 2018Co-Authors: C. Ballouard, M. Poujol, Armin ZehAbstract:In the French Armorican Variscan belt, most of theeconomically significant hydrothermal U deposits are spatiallyassociated with peraluminous leucogranites emplacedalong the south Armorican shear zone (SASZ), a dextral lithosphericscale Wrench Fault that recorded ductile deformationfrom ca. 315 to 300 Ma. In the Pontivy-Rostrenen complex, acomposite intrusion, the U mineralization is spatially associatedwith brittle structures related to deformation along theSASZ. In contrast to monzogranite and quartz monzodiorite(3 < U < 9 ppm; Th/U > 3), the leucogranite samples arecharacterized by highly variable U contents (~ 3 to 27 ppm)and Th/U ratios (~ 0.1 to 5) suggesting that the crystallizationof magmatic uranium oxide in the more evolved facies wasfollowed by uranium oxide leaching during hydrothermal alterationand/or surface weathering. U-Pb dating of uraniumoxides from the deposits reveals that they mostly formed betweenca. 300 and 270 Ma. In monzogranite and quartzmonzodiorite, apatite grains display magmatic textures andprovide U-Pb ages of ca. 315 Ma reflecting the time of emplacementof the intrusions. In contrast, apatite grains from theleucogranite display textural, geochemical, and geochronologicalevidences for interaction with U-rich oxidized hydrothermalfluids contemporaneously with U mineralizingevents. From 300 to 270 Ma, infiltration of surface-derivedoxidized fluids leached magmatic uranium oxide from fertileleucogranite and formed U deposits. This phenomenon wassustained by brittle deformation and by the persistence ofthermal anomalies associated with U-rich granitic bodies.
David R Gray - One of the best experts on this subject based on the ideXlab platform.
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deformation character and palaeo fluid flow across a Wrench Fault within a palaeozoic subduction accretion system waratah Fault zone southeastern australia
Journal of Structural Geology, 1999Co-Authors: David R Gray, Christoph Janssen, Yevgeny VapnikAbstract:Abstract Melange formation, cataclasis, meso- to micro-scale Faulting, and veining reflect Faulting processes within turbidite and limestone sequences juxtaposed along a steeply dipping, sinistral Wrench-Fault zone in the Lachlan Orogen, southeastern Australia. Fault damage occurs across a zone up to 600 m wide. Effects of Faulting in the turbidites are shown by a 100–150 m wide zone of scaly mudstone-matrix melange, mud-injection `dykes' and veinlets, and refolding of melange fabrics, with minor subsidiary brittle-Faulting and cataclasis extending up to 500 m from the major Fault plane. Veining and cataclastic zones occur in the limestone and are most pronounced up to 100 m from the main brittle Fault. Fluid inclusion data from quartz and calcite veins suggest Faulting took place at temperatures between 160 and 200°C, whereas folding is inferred to have taken place at temperatures above 300°C. Fluid-assisted, Fault zone `weakening' mechanisms (pressure solution/solution transfer) were active over the whole Fault zone. Veining, characteristic of fluid-assisted Fault zone `strengthening' processes (i.e. rock-mass cementation), is confined to the limestone sequence. Here, calcite precipation led to Fault rocks with lower porosity and permeability than in the turbidite sequence. Overprinting between different veins and fractures, and zonation in vein cement suggest cyclic deformation and fluid flow. The repeated change between brittle fracturing and veining/cementation led to a combined conduit–barrier system in the limestone sequence, whereas the melange zone in the turbidites acted as a fluid conduit only.
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Deformation character and palaeo-fluid flow across a Wrench Fault within a Palaeozoic subduction–accretion system: Waratah Fault Zone, southeastern Australia
Journal of Structural Geology, 1999Co-Authors: David R Gray, Christoph Janssen, Yevgeny VapnikAbstract:Abstract Melange formation, cataclasis, meso- to micro-scale Faulting, and veining reflect Faulting processes within turbidite and limestone sequences juxtaposed along a steeply dipping, sinistral Wrench-Fault zone in the Lachlan Orogen, southeastern Australia. Fault damage occurs across a zone up to 600 m wide. Effects of Faulting in the turbidites are shown by a 100–150 m wide zone of scaly mudstone-matrix melange, mud-injection `dykes' and veinlets, and refolding of melange fabrics, with minor subsidiary brittle-Faulting and cataclasis extending up to 500 m from the major Fault plane. Veining and cataclastic zones occur in the limestone and are most pronounced up to 100 m from the main brittle Fault. Fluid inclusion data from quartz and calcite veins suggest Faulting took place at temperatures between 160 and 200°C, whereas folding is inferred to have taken place at temperatures above 300°C. Fluid-assisted, Fault zone `weakening' mechanisms (pressure solution/solution transfer) were active over the whole Fault zone. Veining, characteristic of fluid-assisted Fault zone `strengthening' processes (i.e. rock-mass cementation), is confined to the limestone sequence. Here, calcite precipation led to Fault rocks with lower porosity and permeability than in the turbidite sequence. Overprinting between different veins and fractures, and zonation in vein cement suggest cyclic deformation and fluid flow. The repeated change between brittle fracturing and veining/cementation led to a combined conduit–barrier system in the limestone sequence, whereas the melange zone in the turbidites acted as a fluid conduit only.
M. Poujol - One of the best experts on this subject based on the ideXlab platform.
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Uranium metallogenesis of the peraluminous leucogranite from the Pontivy-Rostrenen magmatic complex (French Armorican Variscan belt): the result of long-term oxidized hydrothermal alteration during strike-slip deformation
Mineralium Deposita, 2018Co-Authors: C. Ballouard, M. Poujol, J. Mercadier, E. Deloule, P. Boulvais, J. M. Baele, M. Cuney, M. CathelineauAbstract:In the French Armorican Variscan belt, most of the economically significant hydrothermal U deposits are spatially associated with peraluminous leucogranites emplaced along the south Armorican shear zone (SASZ), a dextral lithospheric scale Wrench Fault that recorded ductile deformation from ca. 315 to 300 Ma. In the Pontivy-Rostrenen complex, a composite intrusion, the U mineralization is spatially associated with brittle structures related to deformation along the SASZ. In contrast to monzogranite and quartz monzodiorite (3
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Uranium metallogenesis of the peraluminous leucogranite from the Pontivy-Rostrenen magmatic complex (French Armorican Variscan belt): the result of long-term oxidized hydrothermal alteration during strike-slip deformation
Mineralium Deposita, 2018Co-Authors: C. Ballouard, M. Poujol, J. Mercadier, E. Deloule, P. Boulvais, M. Cuney, M. Cathelineau, J. M. BaeleAbstract:In the French Armorican Variscan belt, most of theeconomically significant hydrothermal U deposits are spatiallyassociated with peraluminous leucogranites emplacedalong the south Armorican shear zone (SASZ), a dextral lithosphericscale Wrench Fault that recorded ductile deformationfrom ca. 315 to 300 Ma. In the Pontivy-Rostrenen complex, acomposite intrusion, the U mineralization is spatially associatedwith brittle structures related to deformation along theSASZ. In contrast to monzogranite and quartz monzodiorite(3 < U < 9 ppm; Th/U > 3), the leucogranite samples arecharacterized by highly variable U contents (~ 3 to 27 ppm)and Th/U ratios (~ 0.1 to 5) suggesting that the crystallizationof magmatic uranium oxide in the more evolved facies wasfollowed by uranium oxide leaching during hydrothermal alterationand/or surface weathering. U-Pb dating of uraniumoxides from the deposits reveals that they mostly formed betweenca. 300 and 270 Ma. In monzogranite and quartzmonzodiorite, apatite grains display magmatic textures andprovide U-Pb ages of ca. 315 Ma reflecting the time of emplacementof the intrusions. In contrast, apatite grains from theleucogranite display textural, geochemical, and geochronologicalevidences for interaction with U-rich oxidized hydrothermalfluids contemporaneously with U mineralizingevents. From 300 to 270 Ma, infiltration of surface-derivedoxidized fluids leached magmatic uranium oxide from fertileleucogranite and formed U deposits. This phenomenon wassustained by brittle deformation and by the persistence ofthermal anomalies associated with U-rich granitic bodies.
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Multiple crust reworking in the French Armorican Variscan belt: implication for the genesis of uranium-fertile leucogranites
International Journal of Earth Sciences, 2018Co-Authors: C. Ballouard, M. Poujol, Armin ZehAbstract:In the French Armorican Variscan belt, most of theeconomically significant hydrothermal U deposits are spatiallyassociated with peraluminous leucogranites emplacedalong the south Armorican shear zone (SASZ), a dextral lithosphericscale Wrench Fault that recorded ductile deformationfrom ca. 315 to 300 Ma. In the Pontivy-Rostrenen complex, acomposite intrusion, the U mineralization is spatially associatedwith brittle structures related to deformation along theSASZ. In contrast to monzogranite and quartz monzodiorite(3 < U < 9 ppm; Th/U > 3), the leucogranite samples arecharacterized by highly variable U contents (~ 3 to 27 ppm)and Th/U ratios (~ 0.1 to 5) suggesting that the crystallizationof magmatic uranium oxide in the more evolved facies wasfollowed by uranium oxide leaching during hydrothermal alterationand/or surface weathering. U-Pb dating of uraniumoxides from the deposits reveals that they mostly formed betweenca. 300 and 270 Ma. In monzogranite and quartzmonzodiorite, apatite grains display magmatic textures andprovide U-Pb ages of ca. 315 Ma reflecting the time of emplacementof the intrusions. In contrast, apatite grains from theleucogranite display textural, geochemical, and geochronologicalevidences for interaction with U-rich oxidized hydrothermalfluids contemporaneously with U mineralizingevents. From 300 to 270 Ma, infiltration of surface-derivedoxidized fluids leached magmatic uranium oxide from fertileleucogranite and formed U deposits. This phenomenon wassustained by brittle deformation and by the persistence ofthermal anomalies associated with U-rich granitic bodies.
J. M. Baele - One of the best experts on this subject based on the ideXlab platform.
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Uranium metallogenesis of the peraluminous leucogranite from the Pontivy-Rostrenen magmatic complex (French Armorican Variscan belt): the result of long-term oxidized hydrothermal alteration during strike-slip deformation
Mineralium Deposita, 2018Co-Authors: C. Ballouard, M. Poujol, J. Mercadier, E. Deloule, P. Boulvais, J. M. Baele, M. Cuney, M. CathelineauAbstract:In the French Armorican Variscan belt, most of the economically significant hydrothermal U deposits are spatially associated with peraluminous leucogranites emplaced along the south Armorican shear zone (SASZ), a dextral lithospheric scale Wrench Fault that recorded ductile deformation from ca. 315 to 300 Ma. In the Pontivy-Rostrenen complex, a composite intrusion, the U mineralization is spatially associated with brittle structures related to deformation along the SASZ. In contrast to monzogranite and quartz monzodiorite (3
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Uranium metallogenesis of the peraluminous leucogranite from the Pontivy-Rostrenen magmatic complex (French Armorican Variscan belt): the result of long-term oxidized hydrothermal alteration during strike-slip deformation
Mineralium Deposita, 2018Co-Authors: C. Ballouard, M. Poujol, J. Mercadier, E. Deloule, P. Boulvais, M. Cuney, M. Cathelineau, J. M. BaeleAbstract:In the French Armorican Variscan belt, most of theeconomically significant hydrothermal U deposits are spatiallyassociated with peraluminous leucogranites emplacedalong the south Armorican shear zone (SASZ), a dextral lithosphericscale Wrench Fault that recorded ductile deformationfrom ca. 315 to 300 Ma. In the Pontivy-Rostrenen complex, acomposite intrusion, the U mineralization is spatially associatedwith brittle structures related to deformation along theSASZ. In contrast to monzogranite and quartz monzodiorite(3 < U < 9 ppm; Th/U > 3), the leucogranite samples arecharacterized by highly variable U contents (~ 3 to 27 ppm)and Th/U ratios (~ 0.1 to 5) suggesting that the crystallizationof magmatic uranium oxide in the more evolved facies wasfollowed by uranium oxide leaching during hydrothermal alterationand/or surface weathering. U-Pb dating of uraniumoxides from the deposits reveals that they mostly formed betweenca. 300 and 270 Ma. In monzogranite and quartzmonzodiorite, apatite grains display magmatic textures andprovide U-Pb ages of ca. 315 Ma reflecting the time of emplacementof the intrusions. In contrast, apatite grains from theleucogranite display textural, geochemical, and geochronologicalevidences for interaction with U-rich oxidized hydrothermalfluids contemporaneously with U mineralizingevents. From 300 to 270 Ma, infiltration of surface-derivedoxidized fluids leached magmatic uranium oxide from fertileleucogranite and formed U deposits. This phenomenon wassustained by brittle deformation and by the persistence ofthermal anomalies associated with U-rich granitic bodies.
