Paleoproterozoic crustal evolution of the Tarim Craton: Constrained by;zircon U-Pb and Hf isotopes of meta-igneous rocks from Korla and;Dunhuang

doi:10.1016/j.jseaes.2013.07.022

	Paleoproterozoic crustal evolution of the Tarim Craton: Constrained by;zircon U-Pb and Hf isotopes of meta-igneous rocks from Korla and;Dunhuang
	He, Zhen-Yu 5; Zhang, Ze-Ming ; Zong, Ke-Qing ; Dong, Xin 2
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2013
卷号	78;SI SI 页码:54-70
关键词	Columbia supercontinent Crustal evolution Magmatic activities Proterozoic Tarim Craton
ISSN号	1367-9120;EI 1878-5786
DOI	10.1016/j.jseaes.2013.07.022
英文摘要	The Tarim Craton is one of three large cratons in China. Presently, there is only scant information concerning its crustal evolutionary history because most of the existing geochronological studies have lacked a combined isotopic analysis, especially an in situ Lu-Hf isotope analysis of zircon. In this study, Precambrian basement rocks from the Kuluketage and Dunhuang Blocks in the northeastern portion of the Tarim Craton have been analyzed for combined in situ laser ablation ICP-(MC)-MS zircon U-Pb and Lu-Hf isotopic analyses, as well as whole rock elements, to constrain their protoliths, forming ages and magma sources. Two magmatic events from the Kuluketage Block at similar to 2.4 Ga and similar to 1.85 Ga are revealed, and three stages of magmatic events are detected in the Dunhuang Block, i.e., similar to 2.0 Ga, similar to 1.85 Ga and similar to 1.75 Ga. The similar to 4.85 Ga magmatic rocks from both areas were derived from an isotopically similar crustal source under the same tectonic settings, suggesting that the Kuluketage and Dunhuang Blocks are part of the uniform Precambrian basement of the Tarim Craton. Zircon Hf model ages of the similar to 2.4 Ga magmatism indicate that the crust of the Tarim Craton may have been formed as early as the Paleoarchean period. The similar to 2.0 Ga mafic rock from the Dunhuang Block was formed in an active continental margin setting, representing an important crustal growth event of the Tarim Craton in the mid-Paleoproterozoic that coincides with the global episode of crust formation during the assembly of the Columbia supercontinent. The similar to 1.85 Ga event in the Kuluketage and Dunhuang Blocks primarily involved the reworking of the old crust and most likely related to the collisional event associated with the assembly of the Columbia supercontinent, while the similar to 1.75 Ga magmatism in the Dunhuang Block resulted from a mixture of the reworked Archean crust with juvenile magmas and was most likely related to a post-collisional episode. (C) 2013 Elsevier Ltd. All rights reserved.
学科主题	构造地质学
WOS关键词	NW CHINA EVIDENCE ; IN-SITU ANALYSIS ; LU-HF ; TECTONIC IMPLICATIONS ; MESOPROTEROZOIC SUPERCONTINENT ; GEOCHRONOLOGICAL EVIDENCE ; RODINIA ; SUPERCONTINENT ; PRECAMBRIAN EVOLUTION ; NORTHEASTERN MARGIN ; PLATE ; SUBDUCTION
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000327804600005
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40105]
专题	中国地质科学院地质研究所
作者单位	1.[He, Zhen-Yu 2.Zhang, Ze-Ming 3.Chinese Acad Geol Sci, Inst Geol, State Key Lab Continental Tecton & Dynam, Beijing 100037, Peoples R China. 4.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China. 5.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	He, Zhen-Yu,Zhang, Ze-Ming,Zong, Ke-Qing,et al. Paleoproterozoic crustal evolution of the Tarim Craton: Constrained by;zircon U-Pb and Hf isotopes of meta-igneous rocks from Korla and;Dunhuang[J]. JOURNAL OF ASIAN EARTH SCIENCES,2013,78;SI SI:54-70.
APA	He, Zhen-Yu,Zhang, Ze-Ming,Zong, Ke-Qing,&Dong, Xin.(2013).Paleoproterozoic crustal evolution of the Tarim Craton: Constrained by;zircon U-Pb and Hf isotopes of meta-igneous rocks from Korla and;Dunhuang.JOURNAL OF ASIAN EARTH SCIENCES,78;SI SI,54-70.
MLA	He, Zhen-Yu,et al."Paleoproterozoic crustal evolution of the Tarim Craton: Constrained by;zircon U-Pb and Hf isotopes of meta-igneous rocks from Korla and;Dunhuang".JOURNAL OF ASIAN EARTH SCIENCES 78;SI SI(2013):54-70.