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The formation of the Late Cretaceous Xishan Sn-W deposit, South China: Geochronological and geochemical perspectives
Zhang, Lipeng1,2,5; Zhang, Rongqing1; Hu, Yongbin1; Liang, Jinlong3; Ouyang, Zhixia4; He, Junjie1,2; Chen, Yuxiao1; Guo, Jia1,2; Sun, Weidong5,6,7
2017-10-01
发表期刊LITHOS
卷号290页码:253-268
文章类型Article
摘要The Xishan Sn-W deposit is spatially related to K-feldspar granites in the Yangchun basin, western Guangdong Province, South China. LA-ICP-MS zircon U-Pb dating for the Xishan pluton defines an emplacement age of similar to 79 Ma (78.1 +/- 0.9 Ma; 79.0 +/- 1.2 Ma; 79.3 +/- 0.8 Ma), consistent with the mineralization age of the Xishan Sn-W deposit constrained by molybdenite Re-Os isochron age (79.4 +/- 4.5 Ma) and LA-ICP-MS cassiterite U-Pb ages (78.1 +/- 0.9 Ma and 79.0 +/- 1.2 Ma) for the cassiterite-quartz vein. These indicate a close genetic relationship between the granite and Sn-W mineralization. The Xishan K-feldspar granites have geochemical characteristics of A-type granites, e.g., high total alkali (Na2O + K2O = 7.88-10.07 wt.%), high Ga/Al ratios (10000*Ga/Al > 2.6) and high Zr + Nb + Ce + Y concentrations (>350 ppm). They are further classified as A(2)-type granites. The whole-rock isotopic compositions of K-feldspar granites (initial Sr-87 sr/Sr-86 = 0.705256-0.706181; epsilon(Nd)(t) = -5.4 to -4.8) and zircon epsilon(Hf)(t) values (-7.8 to 2.0) suggest a mixed magma source. The low zircon Ce4+/Ce3+ ratios (12-88) of K-feldspar granites suggest low oxygen fugacities, which is key for enrichment of tin in primary magmas. The K-feldspar granites have experienced strong differentiation as indicated by their high Rb/Sr and K/Rb ratios, and low Nb/Ta and Zr/Hf ratios, which play an important role in ore-forming element transportation and concentration. A-type granite characteristics of the Xishan pluton show that it formed in an extensional environment. The high F and low CI characteristics of the K-feldspar granite are most probably attributed to slab rollback. In the Late Cretaceous, the Xishan Sn-W deposit was located near the interaction of the circum-Pacific and the Tethys tectonic realms. Late Cretaceous Sn-W deposits, including the Xishan deposit, form an EW-trending belt from Guangdong to Yunnan Province in South China. This belt is in accordance with the direction of the Neo-Tethys slab rollback in the Late Cretaceous. In addition, the NS-trending extension has been recognized in the Late Cretaceous in South China. We propose that the Xishan Sn-W deposit should be attributed to the Neo-Tethys slab rollback in the Late Cretaceous. (C) 2017 Elsevier B.V. All rights reserved.
关键词Xishan Sn-w Deposit a -type Granite Geochronology Geochemistry Late Cretaceous South China
DOI10.1016/j.lithos.2017.08.013
收录类别SCI
语种英语
WOS记录号WOS:000413390700016
引用统计
文献类型期刊论文
版本出版稿
条目标识符http://ir.qdio.ac.cn/handle/337002/143237
专题深海极端环境与生命过程研究中心
作者单位1.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangzhou 510640, Guangdong, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100094, Peoples R China
3.Chengdu Univ Technol, Dept Geochem, Chengdu 610059, Sichuan, Peoples R China
4.Geol Bur Nonferrous Met Guangdong Prov, Guangzhou 510062, Guangdong, Peoples R China
5.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China
6.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China
7.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
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Zhang, Lipeng,Zhang, Rongqing,Hu, Yongbin,et al. The formation of the Late Cretaceous Xishan Sn-W deposit, South China: Geochronological and geochemical perspectives[J]. LITHOS,2017,290:253-268.
APA Zhang, Lipeng.,Zhang, Rongqing.,Hu, Yongbin.,Liang, Jinlong.,Ouyang, Zhixia.,...&Sun, Weidong.(2017).The formation of the Late Cretaceous Xishan Sn-W deposit, South China: Geochronological and geochemical perspectives.LITHOS,290,253-268.
MLA Zhang, Lipeng,et al."The formation of the Late Cretaceous Xishan Sn-W deposit, South China: Geochronological and geochemical perspectives".LITHOS 290(2017):253-268.
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