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Paleoproterozoic subduction-related magmatism and crustal evolution of the Dunhuang Block, NW China

文献类型：期刊论文

作者Wang, Zhong-Mei1; Han, Chun-Ming2,3,4; Xiao, Wen-Jiao1,3,4; Su, Ben-Xun1; Ding, Jia-Xin2
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2017-02-01
卷号134页码:13-28
关键词Tarim Craton Dunhuang Block Zircon U-pb Ages And Hf Isotopes Crustal Evolution
ISSN号1367-9120
DOI10.1016/j.jseaes.2016.11.008
文献子类Article
英文摘要The Precambrian basement rocks of the Tarim Craton, NW China, occur mostly along the margins of the craton. These rocks have been metamorphosed under amphibolite-facies or granulite-facies, particularly in the Dunhuang and Kuluketage Blocks, whose crustal evolution and paleographic relationship are still unclear. This study presents in-situ zircon U-Pb ages and Lu-Hf isotopes and whole-rock elemental compositions for the Paleoproterozoic meta-felsic and mafic rocks in the NE Altyn Tagh area in order to constrain the Paleoproterozoic tectono-thermal events of the Dunhuang Block and to further investigate its relation to the Kuluketage Block. The meta-felsic rocks have a crystallization age of similar to 1.96 Ga. Their zircon epsilon(Hf)(t) values vary from -0.5 to +7.2, with T-DM1 model ages from 2.4 to 2.1 Ga, suggesting that their parental magmas were mainly derived from juvenile sources, with a relatively small contribution from preexisting ancient materials. The meta-felsic rocks have geochemical affinities with typical high-Al TTG generated by slab melting except for the extremely low Cr/Ni ratios. The steeply negative slope of their REE patterns indicates that garnet and/or hornblende extraction was involved in the magma generation process. The similar to 2.06 meta-mafic rocks have slightly variable positive epsilon(Hf)(t) values (0 to +3.4), corresponding to fairly uniform T-DM1 model ages of 2.4-2.3 Ga. These results indicate that their parental magma was sourced mainly from juvenile components with minor old materials. The meta-mafic rocks have nearly flat REE patterns that bear a remarkably close resemblance to E-MORB, but the depletion in Nb, Ta, Zr, Hf and Th is typical of arc rocks. The wide range of zircon epsilon(Hf)(t) values from the meta-felsic and mafic rocks indicates that the Dunhuang Block experienced both crustal growth and crustal reworking during the Paleoproterozoic. In both the Dunhuang and Kuluketage Blocks, plenty of early Precambrian basement rocks experienced comparable magmatism and metamorphism. However, the Dunhuang Block has a crust-formation age peaked at similar to 2.83 Ga, and it experienced intensive tectono-thermal events in Paleoproterozoic. These events are nearly absent in the Kuluketage Block. The discrepancy implies that the Dunhuang and Kuluketage Blocks were probably unrelated terranes before Paleoproterozoic. (C) 2016 Elsevier Ltd. All rights reserved.
WOS关键词ZIRCON U-PB ; PLASMA-MASS SPECTROMETRY ; ARCHEAN CONTINENTAL-CRUST ; EASTERN TARIM CRATON ; AQTASHTAGH AREA ; TRACE-ELEMENT ; HF ISOTOPES ; GEOCHRONOLOGICAL EVIDENCE ; PRECAMBRIAN EVOLUTION ; TECTONIC IMPLICATIONS
WOS研究方向Geology
语种英语
WOS记录号WOS:000392767200002
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构973 Program(2014CB440801) ; 973 Program(2014CB440801) ; National Natural Science Foundation(41272107 ; National Natural Science Foundation(41272107 ; National 305 Projects(2011BAB06B04-1) ; National 305 Projects(2011BAB06B04-1) ; 41230207 ; 41230207 ; 41202150 ; 41202150 ; 41390441 ; 41390441 ; 41102132 ; 41102132 ; 41302167) ; 41302167) ; 973 Program(2014CB440801) ; 973 Program(2014CB440801) ; National Natural Science Foundation(41272107 ; National Natural Science Foundation(41272107 ; National 305 Projects(2011BAB06B04-1) ; National 305 Projects(2011BAB06B04-1) ; 41230207 ; 41230207 ; 41202150 ; 41202150 ; 41390441 ; 41390441 ; 41102132 ; 41102132 ; 41302167) ; 41302167) ; 973 Program(2014CB440801) ; 973 Program(2014CB440801) ; National Natural Science Foundation(41272107 ; National Natural Science Foundation(41272107 ; National 305 Projects(2011BAB06B04-1) ; National 305 Projects(2011BAB06B04-1) ; 41230207 ; 41230207 ; 41202150 ; 41202150 ; 41390441 ; 41390441 ; 41102132 ; 41102132 ; 41302167) ; 41302167) ; 973 Program(2014CB440801) ; 973 Program(2014CB440801) ; National Natural Science Foundation(41272107 ; National Natural Science Foundation(41272107 ; National 305 Projects(2011BAB06B04-1) ; National 305 Projects(2011BAB06B04-1) ; 41230207 ; 41230207 ; 41202150 ; 41202150 ; 41390441 ; 41390441 ; 41102132 ; 41102132 ; 41302167) ; 41302167)
源URL[http://ir.iggcas.ac.cn/handle/132A11/52923]  
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Wang, Zhong-Mei
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
4.Xinjiang Res Ctr Mineral Resources, Urumqi 830011, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Zhong-Mei,Han, Chun-Ming,Xiao, Wen-Jiao,et al. Paleoproterozoic subduction-related magmatism and crustal evolution of the Dunhuang Block, NW China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2017,134:13-28.
APA Wang, Zhong-Mei,Han, Chun-Ming,Xiao, Wen-Jiao,Su, Ben-Xun,&Ding, Jia-Xin.(2017).Paleoproterozoic subduction-related magmatism and crustal evolution of the Dunhuang Block, NW China.JOURNAL OF ASIAN EARTH SCIENCES,134,13-28.
MLA Wang, Zhong-Mei,et al."Paleoproterozoic subduction-related magmatism and crustal evolution of the Dunhuang Block, NW China".JOURNAL OF ASIAN EARTH SCIENCES 134(2017):13-28.

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来源：地质与地球物理研究所

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