globalchange  > 影响、适应和脆弱性
DOI: 10.1007/s00531-015-1184-0
Scopus记录号: 2-s2.0-84958051026
论文题名:
Monazite U–Th–Pb EPMA and zircon U–Pb SIMS chronological constraints on the tectonic, metamorphic, and thermal events in the inner part of the Variscan orogen, example from the Sioule series, French Massif Central
作者: Do Couto D.; Faure M.; Augier R.; Cocherie A.; Rossi P.; Li X.-H.; Lin W.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2016
卷: 105, 期:2
起始页码: 557
结束页码: 579
语种: 英语
英文关键词: French Massif Central ; Granulite facies ; Monazite chemistry ; Monazite chemistry ; Monazite U–Th–Pb chemical dating ; Variscan orogeny ; Zircon SIMS geochronology
Scopus关键词: geochronology ; metamorphism ; monazite ; Paleozoic ; tectonics ; temperature anomaly ; thorium ; uranium-lead dating ; zircon ; France ; Massif Central
英文摘要: In the northern Variscan French Massif Central, the Sioule metamorphic series exposes from top to bottom the tectonic superposition of the Upper Gneiss Unit (UGU), Lower Gneiss Unit (LGU), and Para-autochthonous Unit (PAU). The nappe stacking developed throughout two prograde syn-metamorphic events: D1 is a top-to-the-SW shearing coeval with a probable Devonian migmatization and D2 is a top-to-the-NW shearing event. Both events were completed before the unconformable deposition of the undeformed and unmetamorphosed “Tufs anthracifères” formation, dated at ca 330 Ma (Late Visean). Furthermore, the UGU experienced a high-pressure metamorphism ascribed to a D0 event during which eclogite or granulite crystallized in several parts of the UGU. Monazite U–Th–Pb and zircon U–Pb SIMS datings were carried out in order to constrain the ages of these D0, D1, and D2 tectono-metamorphic events. These new geochronological results are placed in a P–T-t diagram constructed for the UGU, LGU, and PAU. Monazite sampled in UGU, LGU, and PAU rocks yields similar 365–350 Ma ages consistent with the D2 event dated in other places of the French Massif Central. A zoned monazite grain from a granulitic paragneiss yields 416 ± 15 and 362 ± 14 Ma ages interpreted as those of the D0 and D2 events, respectively. Zircon from the same granulitic paragneiss yields SIMS ages at 343 ± 2 and 328 ± 2 Ma that are interpreted as recrystallization processes associated with post-thickening thermal events, possibly recording the onset of orogenic collapse of the Northern Massif Central. It is worth to note that neither monazite nor zircon recorded the D1 event. © 2015, Springer-Verlag Berlin Heidelberg.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84958051026&doi=10.1007%2fs00531-015-1184-0&partnerID=40&md5=98b867538659ee84981b9f2db9e068c1
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70189
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: CNRS/INSU, Institut des Sciences de la Terre d’Orléans (ISTO), Université d’Orléans, Campus Géosciences, 1A Rue de la Férollerie, Orléans Cedex 2, France; Département des Sciences de la terre, 13 rue des Maraîchers, Geneva, Switzerland; BRGM, Av. Claude-Guillemin, BP 36009, Orléans Cedex 2, France; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China

Recommended Citation:
Do Couto D.,Faure M.,Augier R.,et al. Monazite U–Th–Pb EPMA and zircon U–Pb SIMS chronological constraints on the tectonic, metamorphic, and thermal events in the inner part of the Variscan orogen, example from the Sioule series, French Massif Central[J]. International Journal of Earth Sciences,2016-01-01,105(2)
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