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Geochronology, petrogenesis and tectonic significance of peraluminous granites from the Chinese Altai, NW China

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LITHOS
出版日期2011-11-01
卷号127期号:1-2页码:261-281
关键词Geochronology Geochemistry Peraluminous Granite Chinese Altai Caob Ridge Subduction
ISSN号0024-4937
DOI10.1016/j.lithos.2011.09.001
文献子类Article
英文摘要The Paleozoic granites in the Chinese Altai are important for the study of tectonic evolution and crustal growth in the Central Asian Orogenic Belt (CAOB). Four representative peraluminous granitic intrusions were selected for systematic studies of zircon U-Pb and Hf isotopic compositions and whole-rock geochemical and Nd-Sr isotopic analyses. These rocks have high ASI (Alumina Saturation Index, (AlO3)-O-2/(CaO + Na2O + K2O)=1.01-1.46 molecular ratios), with 0.6-5.6 wt.% of normative corundum, and are characterized by moderately negative Eu anomalies (Eu/Eu* = 038-0.98) and strong depletion in Ba, Nb and Sr elements. Our data suggest that these intrusions were emplaced from 419 to 393 Ma, consistent with a period of intensive magmatic activities and high temperature metamorphism in the Chinese Altai. While in situ zircon Hf isotopic analyses for these granites give predominantly positive epsilon(Hf)(t) values (+ 0.8 to + 12.8), a few inherited zircons yield negative epsilon(Hf)(t) values from -12.5 to -1.53. The U-Pb age and Hf isotopic data of these inherited zircons are similar to that of the widespread metasediments. In addition, the peraluminous granitic rocks have near-zero or negative epsilon(Nd)(t) values (-33 to -0.5) and relatively high initial Sr-87/Sr-86 ratios (0.7079-0.7266), distinct from those of the I-type granites in the study region, but similar to the Early Paleozoic Habahe sediments. These isotopic compositions suggest that the newly accreted metasediments of Habahe Group may be the major source rock of the peraluminous granites. The geochemical compositions indicate that their precursor magmas were derived from a relatively shallow crustal level (P <= 5 kbar) and zircon saturation temperatures suggest that these granitic intrusions were emplaced at 672-861 degrees C. The peraluminous granitic magmas were generated by dehydration melting of newly accreted materials, which were possibly brought to at least middle crustal depth by subduction-related processes in an active margin, and were subsequently molten by strikingly high ambient temperature probably caused by upwelling of the hot asthenosphere associated with ridge subduction in the Paleozoic. (C) 2011 Elsevier B.V. All rights reserved.
WOS关键词ASIAN OROGENIC BELT ; S-TYPE GRANITES ; ZIRCON U-PB ; PHANEROZOIC CRUSTAL GROWTH ; HF ISOTOPIC COMPOSITIONS ; A-TYPE GRANITES ; CONTINENTAL GROWTH ; RIDGE-SUBDUCTION ; NORTHWEST CHINA ; SLAB BREAKOFF
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000298070600017
出版者ELSEVIER SCIENCE BV
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 ; HKU CRCG ; Hong Kong-Germany Joint Research Scheme ; Hong Kong-Germany Joint Research Scheme ; 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 ; HKU CRCG ; Hong Kong-Germany Joint Research Scheme ; Hong Kong-Germany Joint Research Scheme ; 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 ; HKU CRCG ; Hong Kong-Germany Joint Research Scheme ; Hong Kong-Germany Joint Research Scheme ; 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 ; HKU CRCG ; Hong Kong-Germany Joint Research Scheme ; Hong Kong-Germany Joint Research Scheme ; HKU ; HKU ; 40772130 ; 40772130 ; 40803009) ; 40803009)
源URL[http://ir.iggcas.ac.cn/handle/132A11/73870]  
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, Guangzhou Inst Geochem, Key Lab Isotope Geochronol & Geochem, Guangzhou 510640, Guangdong, 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. Geochronology, petrogenesis and tectonic significance of peraluminous granites from the Chinese Altai, NW China[J]. LITHOS,2011,127(1-2):261-281.
APA Cai, Keda.,Sun, Min.,Yuan, Chao.,Zhao, Guochun.,Xiao, Wenjiao.,...&Wu, Fuyuan.(2011).Geochronology, petrogenesis and tectonic significance of peraluminous granites from the Chinese Altai, NW China.LITHOS,127(1-2),261-281.
MLA Cai, Keda,et al."Geochronology, petrogenesis and tectonic significance of peraluminous granites from the Chinese Altai, NW China".LITHOS 127.1-2(2011):261-281.

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来源：地质与地球物理研究所

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