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  2. 地质与地球物理研究所
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  4. 中国科学院矿产资源研究重点实验室
Three episodes of Precambrian mafic magmatism in the southern Central Tianshan Block (NW China): Insight into an evolving geodynamic model

文献类型：期刊论文

作者Wang, Xin-Shui2,3; Klemd, Reiner4; Gao, Jun3,5; Jiang, Tuo1
刊名PRECAMBRIAN RESEARCH
出版日期2020-12-01
卷号351页码:17
ISSN号0301-9268
关键词CAOB Central Tianshan Microcontinent Mafic magmatism Accretionary processes
DOI10.1016/j.precamres.2020.105961
英文摘要Precambrian microcontinents are an essential component in the tectonic evolution and architecture of the Central Asian Orogenic Belt (CAOB). However, the early crustal evolution and origin of Precambrian microcontinents remain poorly constrained due to the scarcity of early Precambrian rocks. The Chinese Central Tianshan Block (CTB) constitutes a micro-continent in the western CAOB with Precambrian basement rocks along its southern margin. The basement rocks, comprising amphibolite-facies supracrustal assemblages of possible volcano-sedimentary origin, are exposed in the Wuwamen Complex, which occurs as tectonic slivers in the late Paleozoic Wuwamen ophiolitic melange. Here we present in situ zircon U-Pb and Lu-Hf isotopic data and the whole-rock geochemistry of three suites of (meta-)mafic rocks from the Wuwamen Complex and an associated Neoproterozoic gabbro body. The zircon dating revealed that the Wuwamen Complex contains two suites of meta-mafic rocks with protolith formation at ca. 2.55 Ga and 2.21 Ga followed by an amphibolite-facies metamorphic overprint at ca. 1.83 Ga. In addition, an individual gabbro body adjacent to the Wuwamen Complex yielded an emplacement age of ca. 0.69 Ga, reflecting a mid-Neoproterozoic mafic magmatic event in the CTB. Furthermore, zircon U-Pb dating of a crosscutting diorite dyke and a gneissic diorite sourced from a composite batholith in the CTB yielded weighted mean intrusive ages of ca. 320 Ma and 454 Ma, respectively. In conjunction with the field observation, the emplacement ages suggest that the Wuwamen Complex represents a part of the continental arc basement of the CTB. The three suites of (meta-)mafic rocks show geochemical characteristics similar to typical arc-related basalts. Along with the evolved zircon Hf isotopic compositions, it is suggested that these rocks originated from partial melting of a metasomatized sub-continental lithospheric mantle during different events. In conjunction with previous studies, the here presented new data further suggest that the CTB and other microcontinents in the western CAOB record similar Precambrian magmatic and meta-morphic episodes, which are comparable to those of the northern Tarim during Proterozoic times. The here outlined new model indicates that the microcontinents of the western CAOB and the Tarim Craton may have shared a common geodynamic evolution.
WOS关键词ZIRCON U-PB ; ASIAN OROGENIC BELT ; NEOPROTEROZOIC GRANITIC GNEISSES ; HF ISOTOPIC COMPOSITIONS ; NORTHERN TARIM CRATON ; META-IGNEOUS ROCKS ; A-TYPE GRANITES ; CRUSTAL EVOLUTION ; LU-HF ; YILI BLOCK
资助项目National Natural Science Foundation of China[42072079] ; National Natural Science Foundation of China[41902232] ; National Natural Science Foundation of China[41390445] ; China Geological Survey[DD20190060] ; China Postdoctoral Science Foundation[2016M600127]
WOS研究方向Geology
语种英语
出版者ELSEVIER
WOS记录号WOS:000595149400016
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation
源URL[http://ir.iggcas.ac.cn/handle/132A11/99916]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Gao, Jun
作者单位1.Wuhan Ctr China Geol Survey, Lab Isotope Geochem, Wuhan 430205, Peoples R China
2.China Univ Geosci, Sch Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
4.Univ Erlangen Nurnberg, GeoZentrum Nordbayern, Schlossgarten 5a, D-91054 Erlangen, Germany
5.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Xin-Shui,Klemd, Reiner,Gao, Jun,et al. Three episodes of Precambrian mafic magmatism in the southern Central Tianshan Block (NW China): Insight into an evolving geodynamic model[J]. PRECAMBRIAN RESEARCH,2020,351:17.
APA Wang, Xin-Shui,Klemd, Reiner,Gao, Jun,&Jiang, Tuo.(2020).Three episodes of Precambrian mafic magmatism in the southern Central Tianshan Block (NW China): Insight into an evolving geodynamic model.PRECAMBRIAN RESEARCH,351,17.
MLA Wang, Xin-Shui,et al."Three episodes of Precambrian mafic magmatism in the southern Central Tianshan Block (NW China): Insight into an evolving geodynamic model".PRECAMBRIAN RESEARCH 351(2020):17.

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来源：地质与地球物理研究所

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