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Petrogenesis of the Baishan granite stock, Eastern Tianshan, NW China: Geodynamic setting and implications for potential mineralization

文献类型：期刊论文

作者Cao, Mingjian1,2; Qin, KeZhang1; Li, GuangMing1; Evans, Noreen J.2; McInnes, Brent I. A.2; Lu, WeiWei3; Deng, Gang3
刊名LITHOS
出版日期2017-11-01
卷号292页码:278-293
ISSN号0024-4937
关键词I-type Granite Fractional Crystallization Mineralization Potential. Baishan Granite Stock Eastern Tianshan
DOI10.1016/j.lithos.2017.09.010
文献子类Article
英文摘要Located in a region rich in Cu-Ni and Mo mineralization, the Baishan granitic stock is barren for reasons that remain enigmatic. Whole rock elemental and Sr-Nd isotope analysis, major element analysis of a number of minerals, and zircon trace element, U-Pb and Hf isotope analysis were undertaken in order to reveal the petrogenesis of the granites. All granites show typical 1-type characteristics including metaluminous to slightly peraluminous, calc-alkaline signatures with a strong depletion of Nb, Ta, Ti and P, enrichment of light rare earth elements and large ion lithophile elements (e.g., Cs, Rb, Th, U, K). In addition, a strong depletion in Ti and P, highly fractionated light rare earth element patterns and less fractionated heavy rare earth element patterns, and negative correlations between SiO2 and TiO2, Al2O3, MgO, FeOT, P2O5, Zr and Hf suggest significant fractional crystallization of amphibole, apatite, zircon and Ti-bearing minerals. Whole rock Sr-Nd and zircon Hf isotopic compositions show wide variations with (Sr-87/Sr-86); values of 0.70358 to 0.70505, epsilon(Nd) (t) of 3.8 to 7.2, and epsilon(Hf) (t) of 2.4 to 12.2 indicating derivation from partial melting of juvenile lower crust with obvious addition of ancient crust. Zircon U-Pb ages indicate a formation age of similar to 292 Ma, significantly older than the ore-forming granite porphyry and slightly older than the regional mafic-ultramafic, A-type and diabase magmatism of Eastern Tianshan. The granite stocks were likely derived during heating of ascending asthenospheric mantle above a mantle plume in the Early Permian. Mineral chemistry, saturation thermometry, mineral species and whole rock Fe2O3/FeO ratios indicate a crystallization temperature of >980 to 665 degrees C, pressure of similar to 1.6 kbar and oxygen fugacity of <= NNO for the granite stock. Comparing the geochemistry, magma source and crystallization environment for the Early Permian barren granite and Late Triassic ore-related granite porphyry, the low ratios of Sr/Y and low (La/Yb)(N), and reduced oxidation state (<= NNO) in the granitic stock are signatures of infertility for the Early Permian granite. This study implies high Mo mineralization potential for granitic rocks with high Sr/Y, (La/Yb)(N) and highly oxidized conditions. (C) 2017 Elsevier B.V. All rights reserved.
WOS关键词MAFIC-ULTRAMAFIC INTRUSIONS ; ASIAN OROGENIC BELT ; PORPHYRY CU DEPOSIT ; U-PB GEOCHRONOLOGY ; SLAB BREAK-OFF ; TRACE-ELEMENT ; MO DEPOSIT ; WESTERN JUNGGAR ; GEOLOGICAL SIGNIFICANCE ; SULFIDE MINERALIZATION
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
出版者ELSEVIER SCIENCE BV
WOS记录号WOS:000416185500018
资助机构National Natural Sciences Foundation of China(41390444 ; National Natural Sciences Foundation of China(41390444 ; International Postdoctoral Exchange Fellowship Program of China(20150085) ; International Postdoctoral Exchange Fellowship Program of China(20150085) ; 41672090) ; 41672090) ; National Natural Sciences Foundation of China(41390444 ; National Natural Sciences Foundation of China(41390444 ; International Postdoctoral Exchange Fellowship Program of China(20150085) ; International Postdoctoral Exchange Fellowship Program of China(20150085) ; 41672090) ; 41672090) ; National Natural Sciences Foundation of China(41390444 ; National Natural Sciences Foundation of China(41390444 ; International Postdoctoral Exchange Fellowship Program of China(20150085) ; International Postdoctoral Exchange Fellowship Program of China(20150085) ; 41672090) ; 41672090) ; National Natural Sciences Foundation of China(41390444 ; National Natural Sciences Foundation of China(41390444 ; International Postdoctoral Exchange Fellowship Program of China(20150085) ; International Postdoctoral Exchange Fellowship Program of China(20150085) ; 41672090) ; 41672090)
源URL[http://ir.iggcas.ac.cn/handle/132A11/82076]  
专题中国科学院地质与地球物理研究所
通讯作者Cao, Mingjian
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, POB 9825, Beijing 100029, Peoples R China
2.Curtin Univ, TIGeR, Dept Appl Geol, John de Laeter Ctr, Perth, WA 6945, Australia
3.Xinjiang Geoexplorat Bur Geol & Mineral Resources, 6 Geol Party, Hami 839000, Peoples R China
推荐引用方式
GB/T 7714		 Cao, Mingjian,Qin, KeZhang,Li, GuangMing,et al. Petrogenesis of the Baishan granite stock, Eastern Tianshan, NW China: Geodynamic setting and implications for potential mineralization[J]. LITHOS,2017,292:278-293.
APA Cao, Mingjian.,Qin, KeZhang.,Li, GuangMing.,Evans, Noreen J..,McInnes, Brent I. A..,...&Deng, Gang.(2017).Petrogenesis of the Baishan granite stock, Eastern Tianshan, NW China: Geodynamic setting and implications for potential mineralization.LITHOS,292,278-293.
MLA Cao, Mingjian,et al."Petrogenesis of the Baishan granite stock, Eastern Tianshan, NW China: Geodynamic setting and implications for potential mineralization".LITHOS 292(2017):278-293.

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来源：地质与地球物理研究所

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