DOI: 10.1007/s00531-017-1465-x
Scopus记录号: 2-s2.0-85015095240
论文题名: U–Pb geochronology of the Sondalo gabbroic complex (Central Alps) and its position within the Permian post-Variscan extension
作者: Petri B. ; Mohn G. ; Skrzypek E. ; Mateeva T. ; Galster F. ; Manatschal G.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2017
卷: 106, 期: 8 起始页码: 2873
结束页码: 2893
语种: 英语
英文关键词: Alps
; Austroalpine nappes
; Gabbro
; Permian
; U–Pb dating
Scopus关键词: crustal thickness
; emplacement
; extension
; extensional tectonics
; gabbro
; geochronology
; Hercynian orogeny
; nappe
; P-T conditions
; Permian
; rifting
; tectonic evolution
; tectonic setting
; uranium-lead dating
; Alps
; Central Alps
英文摘要:
The end of an orogenic cycle is commonly associated with a general extensional regime, widespread magmatism and complex metamorphic overprints. The Austroalpine domain in SE Switzerland and N Italy preserves a polyphase tectonic history spanning the Carboniferous Variscan orogeny, the Late Carboniferous–Early Permian post-Variscan extension and the Jurassic rifting. In this study, the late- and post-Variscan evolution of the Austroalpine domain is explored by constraining the timing of intrusion of the Sondalo gabbroic complex in the Campo unit. U–Pb zircon dating on magmatic and metamorphic rocks and trace element geochemistry in zircon are performed using laser ablation coupled with mass spectrometry. The ages of both magmatic and metamorphic rocks range between 289 ± 4 and 285 ± 6 Ma. Trace elements in zircon from magmatic rocks indicate that zircon grew in two different chemical systems: an initial one devoid of garnet and with already crystallized plagioclase, and a second one with an increasing modal amount of garnet and lacking (initial) plagioclase. The second system probably reflects mixing of the initial magma with melt derived from the surrounding partially molten metapelites. New results, existing age data and P-T estimates allow to describe the late- to post-Variscan evolution of the Austroalpine domain. These data are compared and integrated in the framework of the Permian geodynamic setting in Western Europe. We present new arguments to consider the “Permian event” in Europe as a process which was temporally distinct from the collapse of the Variscan orogen. Late-Variscan re-equilibration of the crustal thickness occurred between 310 and 290 Ma (i.e. during the collapse phase). Permian mafic magmas emplaced from 290 to 270 Ma formed either during or even after the latest stages of the Variscan collapse. © 2017, Springer-Verlag Berlin Heidelberg.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85015095240&doi=10.1007%2fs00531-017-1465-x&partnerID=40&md5=bf8c1bd3e101dcc9242b826efd05cb16
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69945
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: Ecole et Observatoire des Sciences de la Terre, Institut de Physique du Globe de Strasbourg-CNRS UMR7516, Université de Strasbourg, 1 rue Blessig, Strasbourg Cedex, France; Département Géosciences et Environnement, Université de Cergy-Pontoise, 5, mail Gay Lussac, Neuville-sur-Oise, Cergy-Pontoise Cedex, France; Department of Geology and Mineralogy, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, Japan; Department of Earth and Ocean Sciences, University of Liverpool, Liverpool, United Kingdom; Institute of Earth Sciences, University of Lausanne, Géopolis, Lausanne, Switzerland; Department of Geological Sciences, University of Texas at Austin, Austin, TX, United States
Recommended Citation:
Petri B.,Mohn G.,Skrzypek E.,et al. U–Pb geochronology of the Sondalo gabbroic complex (Central Alps) and its position within the Permian post-Variscan extension[J]. International Journal of Earth Sciences,2017-01-01,106(8)