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Petrogenesis and tectonic implications of Late Devonian arc volcanic rocks in southern Beishan orogen, NW China: Geochemical and Nd-Sr-Hf isotopic constraints

文献类型：期刊论文

作者Guo, Qian-Qian1,2; Chung, Sun -Lin2,3; Xiao, Wen-Jiao4,5; Hou, Quan-Lin1; Li, Shan2,4
刊名LITHOS
出版日期2017-05-01
卷号278页码:84-96
关键词Subduction zone step back Decoupled Nd-Hf isotopes Andesitic-dacitic-rhyolitic assemblage Petrogenesis Magma evolution Beishan
ISSN号0024-4937
DOI10.1016/j.lithos.2017.01.017
文献子类Article
英文摘要Late Devonian (ca. 370 Ma) volcanic rocks provide important information about the nature of magmatism during the tectonic transition between the Early and Late Paleozoic in the Beishan orogen, southern Central Asian Orogenic Belt. They are predominantly an andesitic-dacitic-rhyolitic assemblage, characterized by alkali contents ranging from slightly calcic to slightly alkaline. The rhyolitic rocks are generally ferroan, whereas the andesitic rocks are magnesian. These volcanic rocks exhibit similar trace element characteristics to those of continental arcs. Strongly negative epsilon(Nd)(t) values (-2.8 to-3.6) and high Sr isotopic compositions (initial Sr-87/Sr-86 = 0.7036-0.7108) suggest that they are mainly derived from an ancient crust. However, the positive zircon sw(t) values (+1.4 to +16.4) support the role of juvenile components in their genesis, indicating the significant input of new mantle-derived magmas. These characteristics imply a hybrid derivation, from an ancient crustal source with the addition of juvenile materials during magma genesis, or perhaps heterogeneous contamination or hybridization during magma emplacement. Combined with the regional geology, our results indicate that the Late Devonian magmatism resulted from a southward retreat of the subduction zone, which records significant continental crustal growth in a transitional arc or an accretionary arc setting. The distinct geochemical compositions, especially the Nd-Hf isotope decoupling of the Dundunshan volcanic rocks, imply a significant change in the geodynamic setting in the Late Paleozoic. (C) 2017 Elsevier B.V. All rights reserved.
WOS关键词ZIRCON U-PB ; CONTINENTAL-CRUST ; SILICIC MAGMAS ; CENTRAL-ASIA ; GEOCHRONOLOGICAL EVIDENCE ; ACCRETIONARY OROGENESIS ; MULTIPLE SUBDUCTION ; GRANITIC MAGMAS ; NORTHWEST CHINA ; LOW-TEMPERATURE
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000399258500006
出版者ELSEVIER SCIENCE BV
资助机构National Natural Science Foundation of China(41302177 ; International Postdoctoral Exchange Fellowship Program(20140044) ; Ministry of Science and Technology, Taiwan, ROC(104-2811-M-002-023 ; Ministry of Land and Resources(201211024-04) ; Bureau of Science and Technology for Resource and Environment ; 41230207) ; 104-2811-M-002-143) ; National Natural Science Foundation of China(41302177 ; International Postdoctoral Exchange Fellowship Program(20140044) ; Ministry of Science and Technology, Taiwan, ROC(104-2811-M-002-023 ; Ministry of Land and Resources(201211024-04) ; Bureau of Science and Technology for Resource and Environment ; 41230207) ; 104-2811-M-002-143) ; National Natural Science Foundation of China(41302177 ; International Postdoctoral Exchange Fellowship Program(20140044) ; Ministry of Science and Technology, Taiwan, ROC(104-2811-M-002-023 ; Ministry of Land and Resources(201211024-04) ; Bureau of Science and Technology for Resource and Environment ; 41230207) ; 104-2811-M-002-143) ; National Natural Science Foundation of China(41302177 ; International Postdoctoral Exchange Fellowship Program(20140044) ; Ministry of Science and Technology, Taiwan, ROC(104-2811-M-002-023 ; Ministry of Land and Resources(201211024-04) ; Bureau of Science and Technology for Resource and Environment ; 41230207) ; 104-2811-M-002-143)
源URL[http://ir.iggcas.ac.cn/handle/132A11/42212]  
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Guo, Qian-Qian
作者单位1.Univ Chinese Acad Sci, Key Lab Computat Geodynam, Beijing 100049, Peoples R China
2.Natl Taiwan Univ, Dept Geosci, Taipei 10617, Taiwan
3.Acad Sinica, Inst Earth Sci, Taipei 11529, Taiwan
4.Chinese Acad Sci, Xinjiang Res Ctr Mineral Resources, Xinjiang Inst Ecol & Geog, Urumqi 830011, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Guo, Qian-Qian,Chung, Sun -Lin,Xiao, Wen-Jiao,et al. Petrogenesis and tectonic implications of Late Devonian arc volcanic rocks in southern Beishan orogen, NW China: Geochemical and Nd-Sr-Hf isotopic constraints[J]. LITHOS,2017,278:84-96.
APA Guo, Qian-Qian,Chung, Sun -Lin,Xiao, Wen-Jiao,Hou, Quan-Lin,&Li, Shan.(2017).Petrogenesis and tectonic implications of Late Devonian arc volcanic rocks in southern Beishan orogen, NW China: Geochemical and Nd-Sr-Hf isotopic constraints.LITHOS,278,84-96.
MLA Guo, Qian-Qian,et al."Petrogenesis and tectonic implications of Late Devonian arc volcanic rocks in southern Beishan orogen, NW China: Geochemical and Nd-Sr-Hf isotopic constraints".LITHOS 278(2017):84-96.

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