Geochemistry and chronology of the biotite granite in the Xiaobaishitou W-(Mo) deposit, eastern Tianshan, China: Petrogenesis and tectonic implications

被引:33
作者
Li, Ning [1 ]
Yang, Fuquan [1 ]
Zhang, Zhixin [2 ]
Yang, Chengdong [1 ]
机构
[1] Chinese Acad Geol Sci, Inst Mineral Resources, Minist Natl Resources, Key Lab Metallogeny & Mineral Assessment, Beijing 100037, Peoples R China
[2] Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Xinjiang Res Ctr Mineral Resources, Urumqi 830011, Xinjiang, Peoples R China
基金
中国国家自然科学基金; 国家重点研发计划;
关键词
Xiaobaishitou W-(Mo) ore district; Biotite granite; Eastern Tianshan; Geodynamic setting; DONGGEBI MO DEPOSIT; ASIAN OROGENIC BELT; U-PB GEOCHRONOLOGY; RE-OS GEOCHRONOLOGY; A-TYPE GRANITES; S-TYPE GRANITES; LU-HF ISOTOPE; NORTHWEST CHINA; CONTINENTAL GROWTH; DETRITAL ZIRCONS;
D O I
10.1016/j.oregeorev.2019.03.027
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
The Xiaobaishitou W-(Mo) deposit (Central Tianshan Massif, eastern Tianshan, northwestern China) is a skarn-type tungsten-molybdenum deposit associated with a biotite granite intruding the Mesoproterozoic Kawabulag Group. Here we present the results from zircon U-Pb geochronology, whole-rock geochemical, and Sr-Nd-Hf isotopic analyses of the biotite granite. Zircon U-Pb dating shows that the biotite granite crystallized at 246.4 +/- 1.7 Ma, suggesting that the Xiaobaishitou deposit formed during the Early Triassic. Bulk rock geochemistry shows that the biotite granite has high Si, Rb, K, and light rare earth element contents, but low Ba, Nb, Sr, P, and Ti. Moreover, the rocks have mostly positive epsilon(Hf)(t) values (-0.06 to 4.60), negative epsilon(Nd)(t) values (-3.87 to -2.40), and corresponding Hf isotope T-DM2 ages (1.29-1.71 Ga) and Nd isotope T-DM2 ages (1.23-1.36 Ga). These geochemical and isotopic data imply that the Xiaobaishitou biotite granite derived from both mantle- and crustal-derived magmas. By comparison of the Xiaobaishitou biotite granite to nearby granites from the Donggebi and Baishan Mo deposits, we show that Triassic granites of the eastern Tianshan likely formed in an intra-continental tectonic setting, and magmatism and metallogenesis were probably associated with regional extension.
引用
收藏
页码:999 / 1019
页数:21
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