Pre-Variscan tectonic setting of the south margin of Armorica: Insights from detrital zircon ages distribution and Hf isotopic composition of the S-t-Georges-sur-Loire Unit (S. Armorican Massif, France)

doi:10.1016/j.tecto.2019.06.015

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 岩石圈演化国家重点实验室

	Pre-Variscan tectonic setting of the south margin of Armorica: Insights from detrital zircon ages distribution and Hf isotopic composition of the S-t-Georges-sur-Loire Unit (S. Armorican Massif, France)
	Lin, Wei 1,3; Faure, Michel 2; Li, Xian-Hua 1,3; Ji, Wenbin 4
刊名	TECTONOPHYSICS
	2019-09-05
卷号	766 页码:340-378
关键词	U-Pb-Hf of detrital zircons Provenance Cadomian belt Variscan belt Armorica microcontinent
ISSN号	0040-1951
DOI	10.1016/j.tecto.2019.06.015
英文摘要	The Armorican Massif experienced a poly-orogenic evolution, represented by the Neoproterozoic Cadomian and the Devonian-Carboniferous Variscan tectonothermal events. In the southernmost part of the Armorican Domain (or Armorica microcontinent), the S-t-Georges-sur-Loire Unit consists of a block-in-matrix subunit, and a turbiditic subunit in the South and North, respectively. The S-t-Georges-sur Loire unit is interpreted as a remnant back-arc basin formed in Silurian-Early Devonian (ca. 440-400 Ma), and was deformed during the Variscan orogeny. Most of the sedimentary and magmatic blocks enclosed in clastic matrix are olistoliths derived from an assumed southern area called the "missing domain", presently exposed as the Variscan Mauges Nappe composed of the Cadomian rocks and Early Paleozoic sedimentary cover. The "missing domain" was subducted beneath the Armorican massif during the Variscan collision. Detrital zircon age spectra from sandstones and siltstones from the olistostrome matrix reveal Neoproterozoic and Early Paleozoic age clusters, and less abundant Paleoproterozoic and Archean ages. Hf isotopic compositions of detrital zircons indicate dominantly negative epsilon(Hf) (t) values which are in agreement with a recycled continental source. Minor positive values correspond to a juvenile component that was formed during the Neoproterozoic Cadomian orogeny or Archean-Paleoproterozoic events. The Cambrian and Early Ordovician ages can be related to the pre-Variscan rifting of the Pannotia megacontinent that separated the Armorica microcontinent from Gondwana. Neoproterozoic ages imply a source of the magmatic rocks exposed in the Cadomian belt of the northern part of the Armorica microcontinent, and in the Mauges Nappe.
资助项目	National Natural Science Foundation of China[91855212] ; National Natural Science Foundation of China[91755205] ; National Natural Science Foundation of China[41472193] ; National Key R&D Program of China[2016YFC0600401] ; National Key R&D Program of China[2016YFC0600102]
WOS关键词	U-PB SYSTEMS ; BOHEMIAN MASSIF ; RHEIC OCEAN ; RB-SR ; BELT ; PROVENANCE ; EVOLUTION ; GONDWANA ; BRITTANY ; CONSTRAINTS
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000488141100023
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/93694]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者	Lin, Wei
作者单位	1.Chinese Acad Sci, Inst Earth Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Orleans, ISTO, UMR 7327, F-45071 Orleans 2, France 3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 4.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, 229 Taibai Northern Rd, Xian 710069, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Lin, Wei,Faure, Michel,Li, Xian-Hua,et al. Pre-Variscan tectonic setting of the south margin of Armorica: Insights from detrital zircon ages distribution and Hf isotopic composition of the S-t-Georges-sur-Loire Unit (S. Armorican Massif, France)[J]. TECTONOPHYSICS,2019,766:340-378.
APA	Lin, Wei,Faure, Michel,Li, Xian-Hua,&Ji, Wenbin.(2019).Pre-Variscan tectonic setting of the south margin of Armorica: Insights from detrital zircon ages distribution and Hf isotopic composition of the S-t-Georges-sur-Loire Unit (S. Armorican Massif, France).TECTONOPHYSICS,766,340-378.
MLA	Lin, Wei,et al."Pre-Variscan tectonic setting of the south margin of Armorica: Insights from detrital zircon ages distribution and Hf isotopic composition of the S-t-Georges-sur-Loire Unit (S. Armorican Massif, France)".TECTONOPHYSICS 766(2019):340-378.