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Geochemistry and Nd isotopic composition of the Early Paleozoic flysch sequence in the Chinese Altai, Central Asia: Evidence for a northward-derived mafic source and insight into Nd model ages in accretionary orogen

文献类型：期刊论文

作者Long, Xiaoping1,2; Yuan, Chao1,2; Sun, Min3; Xiao, Wenjiao4; Wang, Yujing1; Cai, Keda3; Jiang, Yingde3
刊名GONDWANA RESEARCH
出版日期2012-09-01
卷号22期号:2页码:554-566
关键词Geochemistry Nd isotope Flysch Provenance Accretionary orogen
ISSN号1342-937X
DOI10.1016/j.gr.2011.04.009
文献子类Article
英文摘要Although Nd isotopic composition of sedimentary rocks is considered as a useful tool to trace the provenance, their Nd model age (T-DM) is usually misused to discuss the timing of crustal formation in accretionary orogen. In the Central Asian Orogenic Belt, an Early Paleozoic flysch sequence extensively occurs in the Chinese Altai and adjacent western Mongolian terranes. Sedimentary rocks in the northwestern Chinese Altai were collected from the flysch sequence for geochemical and Nd isotopic studies. Although these rocks show different geochemical characteristics (e.g., arenaceous and argillaceous), they all have relatively low CIA (Chemical Index of Alteration) values (49-75), indicating a relatively weak weathering source or the absence of compositionally mature alumina-rich minerals produced by chemical weathering processes. Their relatively high ICV (Index of Compositional Variability) values (0.95-1.35) reveal an immature source and indicate that these rocks were probably deposited in an active tectonic setting. The sedimentary rocks from the flysch sequence have high MgO, Sc, Co and low V. Nb, which suggest significant addition of mafic rocks into the source. Modeling based on Nb-Cr and Zr-MgO contents displays nearly 20% to 50% addition of mafic materials. In combination with the age and distribution of mafic rocks in the Chinese Altai and adjacent terranes, a northward-derived mafic source is recommended for the sedimentary sequence. Although the sedimentary rocks have Nd model ages (T-DM = 1.44-1.57 Ga) older than Devonian granites (T-DM = 1.6-1.1 Ga), young detrital zircons from the sediments and inherited zircons from the granites (450-500 Ma) suggest a mixed source consisting of both old crust components and juvenile or less evolved crustal components. This reveals that Nd model ages (T-DM) of metasedimentary rocks and igneous rocks can hardly provide close constrains on the timing of crustal formation in accretionary orogen. With the progresses in adjacent western Mongolian terranes, a tectonic scenario dominated by subduction-accretionary process is suggested to interpret the formation of the Early Paleozoic flysch sequence in the Chinese Altai and adjacent terranes. (c) 2011 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
WOS关键词PHANEROZOIC CRUSTAL GROWTH ; SOUTHWESTERN UNITED-STATES ; ISLAND-ARC SYSTEM ; A-TYPE GRANITES ; TECTONIC EVOLUTION ; SEDIMENTARY-ROCKS ; GORNY-ALTAI ; U-PB ; CONTINENTAL GROWTH ; SOUTHERN SIBERIA
WOS研究方向Geology
语种英语
WOS记录号WOS:000307602000015
出版者ELSEVIER SCIENCE BV
资助机构National Basic Research Program of China(2007CB411308) ; National Basic Research Program of China(2007CB411308) ; National Natural Science Foundation of China(40803009 ; National Natural Science Foundation of China(40803009 ; Hong Kong RGC Grants(HKU704307P) ; Hong Kong RGC Grants(HKU704307P) ; 40725009 ; 40725009 ; 40721063) ; 40721063) ; National Basic Research Program of China(2007CB411308) ; National Basic Research Program of China(2007CB411308) ; National Natural Science Foundation of China(40803009 ; National Natural Science Foundation of China(40803009 ; Hong Kong RGC Grants(HKU704307P) ; Hong Kong RGC Grants(HKU704307P) ; 40725009 ; 40725009 ; 40721063) ; 40721063) ; National Basic Research Program of China(2007CB411308) ; National Basic Research Program of China(2007CB411308) ; National Natural Science Foundation of China(40803009 ; National Natural Science Foundation of China(40803009 ; Hong Kong RGC Grants(HKU704307P) ; Hong Kong RGC Grants(HKU704307P) ; 40725009 ; 40725009 ; 40721063) ; 40721063) ; National Basic Research Program of China(2007CB411308) ; National Basic Research Program of China(2007CB411308) ; National Natural Science Foundation of China(40803009 ; National Natural Science Foundation of China(40803009 ; Hong Kong RGC Grants(HKU704307P) ; Hong Kong RGC Grants(HKU704307P) ; 40725009 ; 40725009 ; 40721063) ; 40721063)
源URL[http://ir.iggcas.ac.cn/handle/132A11/84674]  
专题中国科学院地质与地球物理研究所
通讯作者Yuan, Chao
作者单位1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China
2.Chinese Acad Sci, Xinjiang Res Ctr Mineral Resources, Urumqi 830011, Peoples R China
3.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Long, Xiaoping,Yuan, Chao,Sun, Min,et al. Geochemistry and Nd isotopic composition of the Early Paleozoic flysch sequence in the Chinese Altai, Central Asia: Evidence for a northward-derived mafic source and insight into Nd model ages in accretionary orogen[J]. GONDWANA RESEARCH,2012,22(2):554-566.
APA Long, Xiaoping.,Yuan, Chao.,Sun, Min.,Xiao, Wenjiao.,Wang, Yujing.,...&Jiang, Yingde.(2012).Geochemistry and Nd isotopic composition of the Early Paleozoic flysch sequence in the Chinese Altai, Central Asia: Evidence for a northward-derived mafic source and insight into Nd model ages in accretionary orogen.GONDWANA RESEARCH,22(2),554-566.
MLA Long, Xiaoping,et al."Geochemistry and Nd isotopic composition of the Early Paleozoic flysch sequence in the Chinese Altai, Central Asia: Evidence for a northward-derived mafic source and insight into Nd model ages in accretionary orogen".GONDWANA RESEARCH 22.2(2012):554-566.

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来源：地质与地球物理研究所

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