The latest Neoarchean-Paleoproterozoic evolution of the Dunhuang block,;eastern Tarim craton, northwestern China: Evidence from zircon U-Pb;dating and Hf isotopic analyses

doi:10.1016/j.precamres.2012.11.014

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	The latest Neoarchean-Paleoproterozoic evolution of the Dunhuang block,;eastern Tarim craton, northwestern China: Evidence from zircon U-Pb;dating and Hf isotopic analyses
	Zhang, Jianxin 4; Yu, Shengyao ; Gong, Jianghua ; Li, Huaikun 1; Hou, Kejun 2
刊名	PRECAMBRIAN RESEARCH
	2013
卷号	226 页码:21-42
关键词	Dunhuang block U-Pb dating Hf isotope Neoarchean Paleoproterozoic
ISSN号	0301-9268
DOI	10.1016/j.precamres.2012.11.014
英文摘要	The Dunhuang block, in the easternmost segment of the Tarim craton, exposes Precambrian mafic granulite and felsic gneiss. To better understand the poorly known formation and evolution of the Tarim craton, we carried out detailed field-based petrological and geochronological investigations on the major lithologies of the Dunhuang block. U-Pb dating and Hf isotopic analyses on the mafic granulite and felsic gneiss (TTG gneiss) of the Dunhuang block reveal two distinct age populations: the Latest Neoarchaean (similar to 2.5 Ga) and the Late Palaeoproterozoic (1.82-1.85 Ga). The zircon magmatic cores and metamorphic rims of tonalitic gneisses yield similar ages of similar to 2.5 Ga, supporting the existence of Archean rocks in the Dunhuang block. The short time interval between Latest Neoarchean magmatism and high-grade metamorphism suggests that they were related to the same Latest Neoarchean tectonothermal event. The similar to 2.5 Ga zircons show Hf-depleted mantle model ages between 2.55 Ga and 2.8 Ga with a peak at similar to 2.7 Ga, suggesting that similar to 2.7 Ga juvenile crust of the Dunhuang block was reworked during a 200-300 m.y. period at the end of the Neoarchean. The age of similar to 1.85 Ga obtained from the mafic granulites and felsic gneisses is interpreted as the age of high-pressure granulite fades metamorphism. Combined with the Hf isotopic data, these data suggest that the Dunhuang block experienced similar to 2.7 Ga crustal growth, a similar to 2.5 Ga magmatic-metamorphic event and a 1.82-1.85 Ga (HP) granulite facies metamorphic event. This sequence of events is very similar to that of the North China Craton, implying that the evolutionary history of the Dunhuang block was consistent with that of the North China Craton from the Neoarchean to Paleoproterozoic. (C) 2012 Elsevier B.V. All rights reserved.
学科主题	前寒武纪地质
WOS关键词	ULTRAHIGH-PRESSURE METAMORPHISM ; PRECAMBRIAN CONTINENTAL-CRUST ; NORTH ; CHINA ; SOUTH CHINA ; NW CHINA ; LASER-ABLATION ; 1.85 GA ; MESOPROTEROZOIC ; SUPERCONTINENT ; GEOCHRONOLOGICAL EVIDENCE ; GEOLOGICAL SIGNIFICANCE
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000315543900002
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40189]
专题	中国地质调查局天津地质调查中心
作者单位	1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China. 2.CGS, Tianjin Inst Geol & Mineral Resources, Tianjin 300170, Peoples R China. 3.Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China. 4.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Zhang, Jianxin,Yu, Shengyao,Gong, Jianghua,et al. The latest Neoarchean-Paleoproterozoic evolution of the Dunhuang block,;eastern Tarim craton, northwestern China: Evidence from zircon U-Pb;dating and Hf isotopic analyses[J]. PRECAMBRIAN RESEARCH,2013,226:21-42.
APA	Zhang, Jianxin,Yu, Shengyao,Gong, Jianghua,Li, Huaikun,&Hou, Kejun.(2013).The latest Neoarchean-Paleoproterozoic evolution of the Dunhuang block,;eastern Tarim craton, northwestern China: Evidence from zircon U-Pb;dating and Hf isotopic analyses.PRECAMBRIAN RESEARCH,226,21-42.
MLA	Zhang, Jianxin,et al."The latest Neoarchean-Paleoproterozoic evolution of the Dunhuang block,;eastern Tarim craton, northwestern China: Evidence from zircon U-Pb;dating and Hf isotopic analyses".PRECAMBRIAN RESEARCH 226(2013):21-42.