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Country-rock contamination of magmas associated with the Baogutu porphyry Cu deposit, Xinjiang, China

文献类型：期刊论文

作者Shen, Ping1; Pan, HongDi2
刊名LITHOS
出版日期2013-09-01
卷号177页码:451-469
关键词Contamination Enclaves Heterogeneous phenocryst Sr-Nd isotope Baogutu
ISSN号0024-4937
DOI10.1016/j.lithos.2013.07.019
文献子类Article
英文摘要The Baogutu porphyry Cu deposit, located in the West Junggar Region, Xinjiang, China, has the reduced mineralization features. Baogutu is associated with a Late Carboniferous intrusive complex that was emplaced into Lower Carboniferous volcano-sedimentary sequences. The complex consists of a main-stage diorite stock and late-stage diorite porphyry dikes. The former hosts the most of the Cu mineralization. The main-stage stock has a wide range of composition, from minor gabbro through dominant diorite to tonalite porphyry. These are all inhomogeneous over a few meters, with no distinct boundary between the gabbro, diorite and tonalite porphyry. Some felsic microgranular enclaves and heterogeneous phenocrysts occur in these rocks: the latter is a single mineral with a range of compositions. The elemental and Sr-Nd compositions of the tonalite porphyry have a transitional character from the gabbro and diorite to the country rocks. These findings suggest possible country-rock contamination. Mineral composition data suggest that the primary magma at Baogutu is oxidized I-type magma. The gabbro and diorite have high positive epsilon(Nd)(t) (+3.3 to +6.0) and low initial Sr-87/Sr-87 ratios (0.7035-0.7038), and are characterized by moderately fractionated rare earth element (REE) patterns, pronounced Nb depletion and weak negative Eu anomalies. These observations suggest that the Baogutu magmas were derived from partial melting of a metasomatized mantle wedge and underwent significant country-rock contamination after emplacement. The contamination process involved the felsic components and reduced materials (e.g. Carbonaceous sediment), which caused the chemical variation of the Baogutu rocks and the reduced mineralization features in the Baogutu deposit. Thus, contamination played an important role in the formation of the host rocks and associated mineralization at Baogutu. (C) 2013 Elsevier B.V. All rights reserved.
WOS关键词IN-HORNBLENDE BAROMETER ; MO-AU DEPOSIT ; SUBDUCTED LITHOSPHERE ; NORTHERN XINJIANG ; GRANITIC MAGMAS ; VOLCANIC-ROCKS ; ARC MAGMAS ; NW CHINA ; EVOLUTION ; ORIGIN
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000324721000028
出版者ELSEVIER SCIENCE BV
资助机构Innovative Project of the Chinese Academy of Sciences(KZCX-EW-LY02) ; Innovative Project of the Chinese Academy of Sciences(KZCX-EW-LY02) ; National Science Fund(40972064 ; National Science Fund(40972064 ; National International cooperation in science and technology project(2010DFB23390) ; National International cooperation in science and technology project(2010DFB23390) ; National 305 Project(2011BAB06B01) ; National 305 Project(2011BAB06B01) ; 41272109) ; 41272109) ; Innovative Project of the Chinese Academy of Sciences(KZCX-EW-LY02) ; Innovative Project of the Chinese Academy of Sciences(KZCX-EW-LY02) ; National Science Fund(40972064 ; National Science Fund(40972064 ; National International cooperation in science and technology project(2010DFB23390) ; National International cooperation in science and technology project(2010DFB23390) ; National 305 Project(2011BAB06B01) ; National 305 Project(2011BAB06B01) ; 41272109) ; 41272109) ; Innovative Project of the Chinese Academy of Sciences(KZCX-EW-LY02) ; Innovative Project of the Chinese Academy of Sciences(KZCX-EW-LY02) ; National Science Fund(40972064 ; National Science Fund(40972064 ; National International cooperation in science and technology project(2010DFB23390) ; National International cooperation in science and technology project(2010DFB23390) ; National 305 Project(2011BAB06B01) ; National 305 Project(2011BAB06B01) ; 41272109) ; 41272109) ; Innovative Project of the Chinese Academy of Sciences(KZCX-EW-LY02) ; Innovative Project of the Chinese Academy of Sciences(KZCX-EW-LY02) ; National Science Fund(40972064 ; National Science Fund(40972064 ; National International cooperation in science and technology project(2010DFB23390) ; National International cooperation in science and technology project(2010DFB23390) ; National 305 Project(2011BAB06B01) ; National 305 Project(2011BAB06B01) ; 41272109) ; 41272109)
源URL[http://ir.iggcas.ac.cn/handle/132A11/87264]  
专题中国科学院地质与地球物理研究所
通讯作者Shen, Ping
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Changan Univ, Coll Earth Sci, Xian 710054, Peoples R China
推荐引用方式
GB/T 7714		 Shen, Ping,Pan, HongDi. Country-rock contamination of magmas associated with the Baogutu porphyry Cu deposit, Xinjiang, China[J]. LITHOS,2013,177:451-469.
APA Shen, Ping,&Pan, HongDi.(2013).Country-rock contamination of magmas associated with the Baogutu porphyry Cu deposit, Xinjiang, China.LITHOS,177,451-469.
MLA Shen, Ping,et al."Country-rock contamination of magmas associated with the Baogutu porphyry Cu deposit, Xinjiang, China".LITHOS 177(2013):451-469.

入库方式： OAI收割

来源：地质与地球物理研究所

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