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Geochemistry, zircon U-Pb ages and Hf isotopes of the Paleozoic volcanic rocks in the northwestern Chinese Altai: Petrogenesis and tectonic implications

文献类型：期刊论文

作者Wang, Yujing1,2; Yuan, Chao1; Long, Xiaoping1; Sun, Min3; Xiao, Wenjiao4; Zhao, Guochun3; Cai, Keda3; Jiang, Yingde3
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2011-10-10
卷号42期号:5页码:969-985
关键词Hf Isotope Subduction-accretion Mg-rich Dacite Altai Central Asian Orogenic Belt
ISSN号1367-9120
DOI10.1016/j.jseaes.2010.11.005
文献子类Article
英文摘要Paleozoic intermediate-acidic volcanic rocks exposed in the northwestern Chinese Altai mainly consist of two different lithologic suites: rhyolite suite (RS) and dacite-rhyolite suite (DRS), which were both assigned to the late Ordovician Dongxileke Formation. Zircon U-Pb dating results demonstrate that the RS suite was formed in the late Ordovician (443 +/- 2 and 445 +/- 2 Ma), while the DRS suite yielded much younger ages (411 +/- 4 Ma) that are consistent with the early Devonian Kangbutiebao Formation of the Chinese Altai. Zircons from the two suites all have high epsilon(Hf)(t) values (mostly +2 to +9), indicating a source dominated by juvenile crustal materials. Rhyolites from the two suites are strongly peraluminous and have high SiO2 (70.53-76.94 wt.%) and epsilon(Nd)(t) values between -1.7 and -0.6, similar to those of the Paleozoic granitoids (>300 Ma) but higher than the Early Paleozoic Habahe sediments, suggesting an origin by partial melting of a juvenile crustal source dominated by meta-igneous rocks. Dacite samples from the DRS suite possess high SiO2 contents (64.71-67.77 wt.%) and Mg* values (similar to 52). They have epsilon(Nd)(t) values similar to those of the Habahe sediments, which, in combination with their relative high Th/Yb (>3.5) and low Ba/La (<40) ratios, suggests the dacite was originated from sediment-derived melts modified by depleted mantle peridotite. The Mg-rich dacite formed in a critical period (around 410 Ma), during which voluminous granitic intrusions and rhyolite were produced. Extensive partial melting of subducting sediments in the early Devonian is in agreement with a high geothermal gradient in the Chinese Altai. A hot subduction regime is proposed to interpret the early Devonian tectonic evolution of the Chinese Altai. (C) 2010 Elsevier Ltd. All rights reserved.
WOS关键词PHANEROZOIC CRUSTAL GROWTH ; ASIAN OROGENIC BELT ; HIGH-MG ANDESITES ; NORTHERN XINJIANG ; SOUTHWEST JAPAN ; TRACE-ELEMENT ; IGNEOUS ROCKS ; NW CHINA ; ACCRETIONARY OROGENESIS ; SUBDUCTING SEDIMENTS
WOS研究方向Geology
语种英语
WOS记录号WOS:000296304700014
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Basic Research Program of China(2007CB411308) ; National Basic Research Program of China(2007CB411308) ; National Natural Science Foundation of China(40721063 ; National Natural Science Foundation of China(40721063 ; Hong Kong RGC(HKU704307P) ; Hong Kong RGC(HKU704307P) ; CAS/SAFEA ; CAS/SAFEA ; 40772130 ; 40772130 ; 40803009) ; 40803009) ; National Basic Research Program of China(2007CB411308) ; National Basic Research Program of China(2007CB411308) ; National Natural Science Foundation of China(40721063 ; National Natural Science Foundation of China(40721063 ; Hong Kong RGC(HKU704307P) ; Hong Kong RGC(HKU704307P) ; CAS/SAFEA ; CAS/SAFEA ; 40772130 ; 40772130 ; 40803009) ; 40803009) ; National Basic Research Program of China(2007CB411308) ; National Basic Research Program of China(2007CB411308) ; National Natural Science Foundation of China(40721063 ; National Natural Science Foundation of China(40721063 ; Hong Kong RGC(HKU704307P) ; Hong Kong RGC(HKU704307P) ; CAS/SAFEA ; CAS/SAFEA ; 40772130 ; 40772130 ; 40803009) ; 40803009) ; National Basic Research Program of China(2007CB411308) ; National Basic Research Program of China(2007CB411308) ; National Natural Science Foundation of China(40721063 ; National Natural Science Foundation of China(40721063 ; Hong Kong RGC(HKU704307P) ; Hong Kong RGC(HKU704307P) ; CAS/SAFEA ; CAS/SAFEA ; 40772130 ; 40772130 ; 40803009) ; 40803009)
源URL[http://ir.iggcas.ac.cn/handle/132A11/73496]  
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, Key Lab Isotope Geochronol & Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, 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		 Wang, Yujing,Yuan, Chao,Long, Xiaoping,et al. Geochemistry, zircon U-Pb ages and Hf isotopes of the Paleozoic volcanic rocks in the northwestern Chinese Altai: Petrogenesis and tectonic implications[J]. JOURNAL OF ASIAN EARTH SCIENCES,2011,42(5):969-985.
APA Wang, Yujing.,Yuan, Chao.,Long, Xiaoping.,Sun, Min.,Xiao, Wenjiao.,...&Jiang, Yingde.(2011).Geochemistry, zircon U-Pb ages and Hf isotopes of the Paleozoic volcanic rocks in the northwestern Chinese Altai: Petrogenesis and tectonic implications.JOURNAL OF ASIAN EARTH SCIENCES,42(5),969-985.
MLA Wang, Yujing,et al."Geochemistry, zircon U-Pb ages and Hf isotopes of the Paleozoic volcanic rocks in the northwestern Chinese Altai: Petrogenesis and tectonic implications".JOURNAL OF ASIAN EARTH SCIENCES 42.5(2011):969-985.

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来源：地质与地球物理研究所

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