Geological framework and Paleozoic tectonic history of the Chinese Altai, NW China: a review

doi:10.1016/j.rgg.2011.11.014

	Geological framework and Paleozoic tectonic history of the Chinese Altai, NW China: a review
	Cai, Keda 1; Sun, Min 1; Yuan, Chao 2; Long, Xiaoping 2; Xiao, Wenjiao 3
刊名	RUSSIAN GEOLOGY AND GEOPHYSICS
	2011-12-01
卷号	52 期号:12 页码:1619-1633
关键词	Chinese Altai Caob Subduction-accretion Complex Accretionary Orogensis Tectonic Evolution Ridge Subduction
ISSN号	1068-7971
DOI	10.1016/j.rgg.2011.11.014
文献子类	Article
英文摘要	The Chinese Altai, as a key portion of the Central Asian Orogenic Belt (CAOB), is dominated by variably deformed and metamorphosed sedimentary rocks, volcanic rocks and granitic intrusions. Its Early Paleozoic tectonic setting has been variously considered as a passive continental margin, a subduction-accretion complex, or a Precambrian microcontinent, and two representative competing tectonic models have been proposed, i.e., open-closure versus subduction-accretion. Recent studies demonstrate that the high-grade metamorphic rocks previously considered as fragments of a Precambrian basement have zircon U-Pb ages (predominantly 528 to 466 Ma) similar to those of the widely distributed low-grade metasedimentary rocks named as Habahe Group in the region, and all these meta-sedimentary rocks were dominantly deposited in the Early Paleozoic. Petrological evidence and geochemical compositions further suggest that these meta-sedimentary rocks were probably deposited in an active margin, not a passive continental margin as previously proposed. The detrital zircons of sediments and igneous zircons from granitoids including the inherited ones (mainly 543-421 Ma) mostly give positive epsilon(Hf)(t) values, suggesting significant contributions from mantle-derived juvenile materials to the lower crust. A modeling calculation based on zircon Hf isotopic compositions suggests that as much as 84% of the Chinese Altai is possibly made up of "juvenile" Paleozoic materials. Thus, available data do not support the existence of a Precambrian basement, but rather indicate that the Chinese Altai represented a huge subduction-accretion complex in the Paleozoic. Zircon U-Pb dating results for granitoids indicate that magmatism was active continuously from the Early to Middle Paleozoic, and the strongest magmatic activity took place in the Devonian, coeval with a significant change in zircon Hf isotopic composition. These findings, together with the occurrence of chemically distinctive igneous rocks and the high-T metamorphism, can be collectively accounted for by ridge-trench interaction during the accretionary orogenic process. (C) 2011, V. S. Sobolev IGM, Siberian Branch of the RAS. Published by Elsevier B. V. All rights reserved.
WOS关键词	ASIAN OROGENIC BELT ; PHANEROZOIC CRUSTAL GROWTH ; ZIRCON U-PB ; NORTHWEST CHINA ; ACCRETIONARY OROGENS ; ISOTOPIC EVIDENCE ; CORDILLERAN INTERIOR ; CONTINENTAL GROWTH ; NORTHERN XINJIANG ; RIDGE-SUBDUCTION
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000298140500010
资助机构	National Basic Research Program of China(2007CB411308) ; National Basic Research Program of China(2007CB411308) ; Hong Kong Research Grants Council(HKU704307P) ; Hong Kong Research Grants Council(HKU704307P) ; National Natural Science Foundation of China(40721063 ; National Natural Science Foundation of China(40721063 ; HKU CRCG(200711159058) ; HKU CRCG(200711159058) ; HKU ; HKU ; 40772130 ; 40772130 ; 40803009) ; 40803009) ; National Basic Research Program of China(2007CB411308) ; National Basic Research Program of China(2007CB411308) ; Hong Kong Research Grants Council(HKU704307P) ; Hong Kong Research Grants Council(HKU704307P) ; National Natural Science Foundation of China(40721063 ; National Natural Science Foundation of China(40721063 ; HKU CRCG(200711159058) ; HKU CRCG(200711159058) ; HKU ; HKU ; 40772130 ; 40772130 ; 40803009) ; 40803009) ; National Basic Research Program of China(2007CB411308) ; National Basic Research Program of China(2007CB411308) ; Hong Kong Research Grants Council(HKU704307P) ; Hong Kong Research Grants Council(HKU704307P) ; National Natural Science Foundation of China(40721063 ; National Natural Science Foundation of China(40721063 ; HKU CRCG(200711159058) ; HKU CRCG(200711159058) ; HKU ; HKU ; 40772130 ; 40772130 ; 40803009) ; 40803009) ; National Basic Research Program of China(2007CB411308) ; National Basic Research Program of China(2007CB411308) ; Hong Kong Research Grants Council(HKU704307P) ; Hong Kong Research Grants Council(HKU704307P) ; National Natural Science Foundation of China(40721063 ; National Natural Science Foundation of China(40721063 ; HKU CRCG(200711159058) ; HKU CRCG(200711159058) ; HKU ; HKU ; 40772130 ; 40772130 ; 40803009) ; 40803009)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/73646]
专题	中国科学院地质与地球物理研究所
通讯作者	Sun, Min
作者单位	1.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China 2.Chinese Acad Sci, Key Lab Isotope Geochronol & Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China 3.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Cai, Keda,Sun, Min,Yuan, Chao,et al. Geological framework and Paleozoic tectonic history of the Chinese Altai, NW China: a review[J]. RUSSIAN GEOLOGY AND GEOPHYSICS,2011,52(12):1619-1633.
APA	Cai, Keda,Sun, Min,Yuan, Chao,Long, Xiaoping,&Xiao, Wenjiao.(2011).Geological framework and Paleozoic tectonic history of the Chinese Altai, NW China: a review.RUSSIAN GEOLOGY AND GEOPHYSICS,52(12),1619-1633.
MLA	Cai, Keda,et al."Geological framework and Paleozoic tectonic history of the Chinese Altai, NW China: a review".RUSSIAN GEOLOGY AND GEOPHYSICS 52.12(2011):1619-1633.