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Keketuohai mafic-ultramafic complex in the Chinese Altai, NW China: Petrogenesis and geodynamic significance

文献类型：期刊论文

作者Cai, Keda1; Sun, Min1; Yuan, Chao2; Zhao, Guochun1; Xiao, Wenjiao3; Long, Xiaoping2
刊名CHEMICAL GEOLOGY
出版日期2012-02-10
卷号294页码:26-41
关键词Mafic-ultramafic complex Petrogenesis Chinese Altai CAOB Ridge subduction
ISSN号0009-2541
DOI10.1016/j.chemgeo.2011.11.031
文献子类Article
英文摘要Devonian magmatism was very intensive in the tectonic evolutionary history of the Chinese Altai, a key part of the Central Asian Orogenic Belt (CAOB). The Devonian Keketuohai mafic-ultramafic complex in the Chinese Altai is a zoned intrusion consisting of dunite, olivine gabbro, hornblende gabbro and pyroxene diorite. The pyroxene diorite gives a zircon U-Pb age of 409 +/- 5 Ma. Variations in mineral assemblage and chemical composition suggest that the petrogenesis of the Keketuohai Complex was chiefly governed by fractional crystallization from a common magma chamber. Low SiO2, K2O and Na2O contents, negative covariations between P2O5, TiO2 and Mg# value suggest insignificant crustal assimilation/contamination. Thus the positive epsilon(Nd)(t) values (0 to + 2.7) and slight enrichments in light rare earth elements (e.g., La/Yb-N = 0.98-3.64) suggest that their parental magma was possibly produced by partial melting of the lithospheric mantle. Model calculation suggests that their parental magma was high-Mg (Mg#=66) tholeiitic basaltic melt. The Keketuohai intrusion was coeval with diverse magmatism, high temperature metamorphism and hydrothermal mineralization, which support a previously proposed model that ridge subduction most likely played an important role in the tectonic evolution of the Chinese Altai. (C) 2011 Elsevier B.V. All rights reserved.
WOS关键词RARE-EARTH-ELEMENTS ; PHANEROZOIC CRUSTAL GROWTH ; HF ISOTOPIC COMPOSITIONS ; PB ZIRCON GEOCHRONOLOGY ; NI SULFIDE DEPOSITS ; ASIAN OROGENIC BELT ; U-PB ; TECTONIC EVOLUTION ; RIDGE-SUBDUCTION ; NORTHWEST CHINA
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000304213800003
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 ; HKU705311P) ; HKU705311P) ; 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 ; HKU705311P) ; HKU705311P) ; 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 ; HKU705311P) ; HKU705311P) ; 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 ; HKU705311P) ; HKU705311P) ; 40772130 ; 40772130 ; 40803009) ; 40803009)
源URL[http://ir.iggcas.ac.cn/handle/132A11/84520]  
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, 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. Keketuohai mafic-ultramafic complex in the Chinese Altai, NW China: Petrogenesis and geodynamic significance[J]. CHEMICAL GEOLOGY,2012,294:26-41.
APA Cai, Keda,Sun, Min,Yuan, Chao,Zhao, Guochun,Xiao, Wenjiao,&Long, Xiaoping.(2012).Keketuohai mafic-ultramafic complex in the Chinese Altai, NW China: Petrogenesis and geodynamic significance.CHEMICAL GEOLOGY,294,26-41.
MLA Cai, Keda,et al."Keketuohai mafic-ultramafic complex in the Chinese Altai, NW China: Petrogenesis and geodynamic significance".CHEMICAL GEOLOGY 294(2012):26-41.

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来源：地质与地球物理研究所

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