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Prolonged magmatism, juvenile nature and tectonic evolution of the Chinese Altai, NW China: Evidence from zircon U-Pb and Hf isotopic study of Paleozoic granitoids

文献类型：期刊论文

作者Cai, Keda1; Sun, Min1; Yuan, Chao2; Zhao, Guochun1; Xiao, Wenjiao3; Long, Xiaoping2; Wu, Fuyuan3
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2011-10-10
卷号42期号:5页码:949-968
关键词Zircon U-Pb age Hf isotope Granitoids Chinese Altai CAOB Ridge subduction
ISSN号1367-9120
DOI10.1016/j.jseaes.2010.11.020
文献子类Article
英文摘要Paleozoic granitoid magmatism played an important role in the tectonic evolution of the Chinese Altai, and zircon U-Pb and Hf isotopic compositions have been determined for samples from eleven granitic plutons/batholiths. The Jiadengyu gneissic granitic pluton yielded a zircon U-Pb age of 479 Ma, and thus it does not represent Precambrian basement as suggested previously. Our results and published data demonstrate that voluminous granitoids were continuously emplaced over more than 30% area of the Chinese Altai during the period from 447 Ma to 368 Ma with a climax at ca. 400 Ma. Ages for zircon over-growth rims demonstrate additional thermal events at ca. 360 and 280 Ma, respectively. Positive epsilon(Hf)(t) values (0 to +9) of normal magmatic zircons suggest that the granitoid magmas were derived from juvenile sources. Xenocrystic zircon cores are 543-421 Ma old and also give positive epsilon(Hf)(t) values (+2.5 to +12), suggesting their origin as early crystallized minerals in the magma chambers or as inherited cores from newly-accreted meterials. The strong magmatism at ca. 400 Ma significantly changed the Hf isotopic composition of the magma source by substantial input of juvenile material in a relatively short period. Geophysical, geological and geochemical data support that ridge subduction was a possible mechanism for the strong magmatism ca. 400 Ma and the above mentioned change of Hf isotopic composition in the magma source. (C) 2011 Elsevier Ltd. All rights reserved.
WOS关键词ASIAN OROGENIC BELT ; RIDGE SUBDUCTION ; NORTHWEST CHINA ; LU-HF ; CONTINENTAL GROWTH ; NORTHERN XINJIANG ; SOUTHERN ALASKA ; CRUSTAL GROWTH ; ACCRETIONARY OROGENESIS ; METAMORPHIC ROCKS
WOS研究方向Geology
语种英语
WOS记录号WOS:000296304700013
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构Chinese National 973 Program(2007CB411308) ; Chinese National 973 Program(2007CB411308) ; Hong Kong Research Grants Council(HKU704307P) ; Hong Kong Research Grants Council(HKU704307P) ; NSFC(40725009) ; NSFC(40725009) ; HKU ; HKU ; Chinese National 973 Program(2007CB411308) ; Chinese National 973 Program(2007CB411308) ; Hong Kong Research Grants Council(HKU704307P) ; Hong Kong Research Grants Council(HKU704307P) ; NSFC(40725009) ; NSFC(40725009) ; HKU ; HKU ; Chinese National 973 Program(2007CB411308) ; Chinese National 973 Program(2007CB411308) ; Hong Kong Research Grants Council(HKU704307P) ; Hong Kong Research Grants Council(HKU704307P) ; NSFC(40725009) ; NSFC(40725009) ; HKU ; HKU ; Chinese National 973 Program(2007CB411308) ; Chinese National 973 Program(2007CB411308) ; Hong Kong Research Grants Council(HKU704307P) ; Hong Kong Research Grants Council(HKU704307P) ; NSFC(40725009) ; NSFC(40725009) ; HKU ; HKU
源URL[http://ir.iggcas.ac.cn/handle/132A11/74387]  
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, Peoples R China
3.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		 Cai, Keda,Sun, Min,Yuan, Chao,et al. Prolonged magmatism, juvenile nature and tectonic evolution of the Chinese Altai, NW China: Evidence from zircon U-Pb and Hf isotopic study of Paleozoic granitoids[J]. JOURNAL OF ASIAN EARTH SCIENCES,2011,42(5):949-968.
APA Cai, Keda.,Sun, Min.,Yuan, Chao.,Zhao, Guochun.,Xiao, Wenjiao.,...&Wu, Fuyuan.(2011).Prolonged magmatism, juvenile nature and tectonic evolution of the Chinese Altai, NW China: Evidence from zircon U-Pb and Hf isotopic study of Paleozoic granitoids.JOURNAL OF ASIAN EARTH SCIENCES,42(5),949-968.
MLA Cai, Keda,et al."Prolonged magmatism, juvenile nature and tectonic evolution of the Chinese Altai, NW China: Evidence from zircon U-Pb and Hf isotopic study of Paleozoic granitoids".JOURNAL OF ASIAN EARTH SCIENCES 42.5(2011):949-968.

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