Geochemical and zircon U-Pb and Lu-Hf isotopic constraints on the origin of supracrustal rocks from the mid-Qilian terrane: A comparison between supracrustal rocks on the two sides of the eastern segment of the Altyn Tagh Fault

doi:10.1016/j.precamres.2017.04.005

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

	Geochemical and zircon U-Pb and Lu-Hf isotopic constraints on the origin of supracrustal rocks from the mid-Qilian terrane: A comparison between supracrustal rocks on the two sides of the eastern segment of the Altyn Tagh Fault
	Wang, Zhong-Mei 1; Han, Chun-Ming 2,3,4; Xiao, Wen-Jiao 1,3,4; Su, Ben-Xun 1; Ding, Jia-Xin 2; Song, Shuai-Hua 1
刊名	PRECAMBRIAN RESEARCH
	2017-06-01
卷号	294 页码:284-306
关键词	Mid-Qilian terrane Beidahe Group Dunhuang Group Zircon U-Pb ages and Hf isotopes
ISSN号	0301-9268
DOI	10.1016/j.precamres.2017.04.005
文献子类	Article
英文摘要	Comparisons between the tectonic units on two sides of the sinistral ENE-striking Altyn Tagh Fault (ATF) are important tracers to find out the corresponding relationships among different terranes. This study focuses on the tectonic units along the eastern segment of the ATF. The Paleoproterozoic Beidahe Group in the mid-Qilian terrane, south side of the eastern segment of the ATF, is mainly composed of metasedimentary rocks and amphibolites. These rocks are petrologically and mineralogically similar to those from the Dunhuang Group, north side of the eastern segment of the ATF. The detrital zircon U-Pb ages indicate that the protolith sediments of the Beidahe metasedimentary rocks were mainly sourced from a provenance dominated by magmatic rocks in ages of 2.85-2.55 Ga, 1.70-1.55 Ga and 1.42-1.03 Ga. This sedimentary sequence was deposited no earlier than 1.03 Ga as passive continental margin deposits. Geochemical and zircon U-Pb and Lu-Hf isotopic data suggest that the Neoarchean-Mesoproterozoic basement rocks from the Tarim Craton most likely provide the majority of source materials for their protolith. Amphibolites from the Beidahe Group have high total Fe2O3 and Al2O3 contents but low Mg# values, indicating a high degree of compositional evolution and contamination of the older crust. They have flat REE patterns but positive LILE and negative Nb-Ta and Ti anomalies, suggesting a back-arc basin basalts (BABBs) affinity for their protolith. The amphibolites have a crystallization age of 1.61 Ga and zircon epsilon(Hf)(t) values ranging from -7.7 to +10.6. The zircon epsilon(Hf)(t) values and whole-rock epsilon(Nd)(t) values indicate an involvement of juvenile and pre-existing old materials in the formation of their parental magmas. Comparisons between the Beidahe and Dunhuang Groups indicate that the metasedimentary rocks from these two groups are both sourced from the Tarim Craton but have different depositional ages, and that the amphibolites have similar crystallization ages but different tectonic settings for their source rocks. The field relationships and geochemical and geochronological characteristics of the metasedimentary rocks and amphibolites from the Beidahe Group support the interpretation that the observed recent proximity of these two rock complexes might be the result of tectonic juxtaposition rather than a primary intrusive contact. (C) 2017 Elsevier B.V. All rights reserved.
WOS关键词	NORTH CHINA CRATON ; BACK-ARC BASIN ; NORTHEASTERN TIBETAN PLATEAU ; TARIM CRATON ; PALEOPROTEROZOIC EVOLUTION ; CRUSTAL EVOLUTION ; DUNHUANG BLOCK ; WESTERN CHINA ; GEOCHRONOLOGICAL EVIDENCE ; COLUMBIA SUPERCONTINENT
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000402217500016
资助机构	973 Program(2014CB440801) ; 973 Program(2014CB440801) ; National Natural Science Foundation(41272107 ; National Natural Science Foundation(41272107 ; China Postdoctoral Foundation fund Project(2015M580133) ; China Postdoctoral Foundation fund Project(2015M580133) ; 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 ; China Postdoctoral Foundation fund Project(2015M580133) ; China Postdoctoral Foundation fund Project(2015M580133) ; 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 ; China Postdoctoral Foundation fund Project(2015M580133) ; China Postdoctoral Foundation fund Project(2015M580133) ; 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 ; China Postdoctoral Foundation fund Project(2015M580133) ; China Postdoctoral Foundation fund Project(2015M580133) ; 41230207 ; 41230207 ; 41202150 ; 41202150 ; 41390441 ; 41390441 ; 41102132 ; 41102132 ; 41302167) ; 41302167)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/52892]
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. Geochemical and zircon U-Pb and Lu-Hf isotopic constraints on the origin of supracrustal rocks from the mid-Qilian terrane: A comparison between supracrustal rocks on the two sides of the eastern segment of the Altyn Tagh Fault[J]. PRECAMBRIAN RESEARCH,2017,294:284-306.
APA	Wang, Zhong-Mei,Han, Chun-Ming,Xiao, Wen-Jiao,Su, Ben-Xun,Ding, Jia-Xin,&Song, Shuai-Hua.(2017).Geochemical and zircon U-Pb and Lu-Hf isotopic constraints on the origin of supracrustal rocks from the mid-Qilian terrane: A comparison between supracrustal rocks on the two sides of the eastern segment of the Altyn Tagh Fault.PRECAMBRIAN RESEARCH,294,284-306.
MLA	Wang, Zhong-Mei,et al."Geochemical and zircon U-Pb and Lu-Hf isotopic constraints on the origin of supracrustal rocks from the mid-Qilian terrane: A comparison between supracrustal rocks on the two sides of the eastern segment of the Altyn Tagh Fault".PRECAMBRIAN RESEARCH 294(2017):284-306.