globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2019.228316
论文题名:
Age of metamorphism and deformation in the Montagne Noire dome (French Massif Central): Tapping into the memory of fine-grained gneisses using monazite U-Th-Pb geochronology
作者: Roger F.; Teyssier C.; Whitney D.L.; Respaut J.-P.; Paquette J.-L.; Rey P.F.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 776
语种: 英语
中文关键词: Exhumation of partially molten crust ; Fine grained gneisses ; High-T deformation ; Migmatite dome ; Monazite U-Th-Pb dating ; Montagne Noire, France
英文关键词: Deformation ; Flow of fluids ; Geochronology ; Lead alloys ; Monazite ; Phosphate minerals ; Shear flow ; Ternary alloys ; Thorium alloys ; Uranium alloys ; Exhumation of partially molten crust ; Fine grained ; High-T ; Migmatite ; Montagne Noire, France ; U-Th-Pb dating ; Domes ; crust ; deformation ; dome ; exhumation ; geochronology ; gneiss ; metamorphism ; migmatite ; monazite ; Paleozoic ; uranium series dating ; France ; Massif Central ; Montagne Noire
英文摘要: Recent work has revealed that the Montagne Noire dome, located in the foreland of the Variscan belt (French Massif Central), contains a record of nearly coeval, late Variscan eclogitization and migmatization. Given these new results, it is important to understand the chronology of events that produced high-grade metamorphism and exhumation. Using U-Th-Pb dating of monazite, this study confirms ages of ~315–300 Ma for high-T metamorphism in the augen gneiss that makes up a large fraction of the Montagne Noire dome, and documents for the first time ~295 Ma monazite ages in compositionally varied fine-grained gneisses that form folded continuous layers within the core of the dome. The fine-grained gneiss layers are intensely sheared and are interpreted to have localized late, high-T deformation in the core of the dome. These sheared fine-grained gneisses form a network of shear zones that were kinematically linked to the extensional and strike-slip deformation zones that exhumed the Montagne Noire dome in a pull-apart (s.l.) domain. Continued deformation-recrystallization and fluid flow within these shear zones likely drove rejuvenation of monazite for ~5 million years after much of the melt had crystallized in the Montagne Noire dome. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170699
Appears in Collections:气候变化与战略

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作者单位: Laboratoire Géosciences Montpellier (CNRS-UMR 5243), Université Montpellier, Campus Triolet, Montpellier Cedex 5, 34095, France; Department of Earth and Environmental Sciences, University of Minnesota, Minneapolis, MN 55455, United States; Laboratoire Magmas et Volcans (CNRS-UMR 6524), Campus Universitaire des Cézeaux, Aubière Cedex, 63178, France; School of Geosciences, University of Sydney, Sydney, NSW 2006, Australia

Recommended Citation:
Roger F.,Teyssier C.,Whitney D.L.,et al. Age of metamorphism and deformation in the Montagne Noire dome (French Massif Central): Tapping into the memory of fine-grained gneisses using monazite U-Th-Pb geochronology[J]. Tectonophysics,2020-01-01,776
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