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

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• 作者：Damien Do Couto ; Michel Faure ; Romain Augier…
• 关键词：Variscan orogeny ; Monazite chemistry ; Monazite U–Th–Pb chemical dating ; Zircon SIMS geochronology ; Granulite facies ; Monazite chemistry ; French Massif Central
• 刊名：International Journal of Earth Sciences
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：105
• 期：2
• 页码：557-579
• 全文大小：6,916 KB
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• 作者单位：Damien Do Couto (1) (2)
  Michel Faure (1)
  Romain Augier (1)
  Alain Cocherie (3)
  Philippe Rossi (3)
  Xian-Hua Li (4)
  Wei Lin (4)
  
  1. CNRS/INSU, Institut des Sciences de la Terre d’Orléans (ISTO), Université d’Orléans, Campus Géosciences, 1A Rue de la Férollerie, 45071, Orléans Cedex 2, France
  2. Département des Sciences de la terre, 13 rue des Maraîchers, 1205, Geneva, Switzerland
  3. BRGM, Av. Claude-Guillemin, BP 36009, 45060, Orléans Cedex 2, France
  4. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geology
  Geophysics and Geodesy
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1437-3262

文摘

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. Keywords Variscan orogeny Monazite chemistry Monazite U–Th–Pb chemical dating Zircon SIMS geochronology Granulite facies Monazite chemistry French Massif Central