The formation of the Late Cretaceous Xishan Sn-W deposit, South China: Geochronological and geochemical perspectives
The formation of the Late Cretaceous Xishan Sn-W deposit, South China: Geochronological and geochemical perspectives
复制标题
华南晚白垩世西山锡钨矿床的形成：年代学和地球化学视角
DOI：
10.1016/j.lithos.2017.08.013
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发表时间：
2017-10
期刊：
影响因子：
3.5
通讯作者：
Sun Weidong
中科院分区：
文献类型：
--
作者：
Zhang Lipeng;Zhang Rongqing;Hu Yongbin;Liang Jinlong;Ouyang Zhixia;He Junjie;Chen Yuxiao;Guo Jia;Sun Weidong
西山锡钨存款矿床与广东阳春盆地钾长花岗岩在空间上有密切关系。西山岩体的LA-ICP-MS锆石U-Pb定年结果为79Ma（78.1 ± 0.9Ma; 79.0 ± 1.2Ma; 79.3 ± 0.8 Ma），与锡山锡钨存款矿床Re-Os等时线年龄一致（79.4 ± 4.5 Ma）和LA-ICP-MS法测得的辉绿石-石英脉的辉绿石U-Pb年龄分别为（78.1 ± 0.9）Ma和（79.0 ± 1.2）Ma。表明花岗岩与锡钨矿化有密切的成因联系。西山钾长花岗岩具有A型花岗岩的地球化学特征，总碱含量高（Na 2 O + K 2 O = 7.88-10.07wt. %），高Ga/Al比（10000 × Ga/Al> 2.6）和高Zr + Nb + Ce + Y浓度（> 350 ppm）。它们被进一步归类为A2型花岗岩。钾长花岗岩的全岩同位素组成（初始87Sr/86Sr = 0.705256 - 0.706181; ε Nd（t）= − 5.4-− 4.8）和锆石ε Hf（t）值（− 7.8 - 2.0）表明岩浆为混合源。钾长花岗岩的低锆石Ce~（4+）/Ce~（3+）比值（12-88）表明其氧逸度低，这是锡在原生岩浆中富集的关键。钾长花岗岩经历了强烈的分异作用，表现为高Rb/Sr和K/Rb比值，低Nb/Ta和Zr/Hf比值，对成矿元素的迁移和富集起着重要作用。西山岩体的A型花岗岩特征表明其形成于拉张环境。钾长石花岗岩的高F和低Cl特征最可能归因于板片回滚。晚白垩世西山锡钨存款位于环太平洋构造域与特提斯构造域的相互作用附近。包括西山存款在内的晚白垩世锡钨矿床形成了一条从广东到云南的东西向带。该带与晚白垩世新特提斯板块回滚的方向一致。此外，华南晚白垩世还存在南北向伸展作用。西山锡钨存款矿床的形成应归因于晚白垩世新特提斯板块回滚作用。
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 ~ 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 A2-type granites. The whole-rock isotopic compositions of K-feldspar granites (initial87Sr/86Sr = 0.705256–0.706181; εNd(t) = − 5.4 to − 4.8) and zircon εHf(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 Cl 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.
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影响因子：
1.8
作者：
Y. Liu;Zheng‐Xiang Li;H. Li;L. Guo;W. Xu;L. Ye;C. Li;D. Pi
通讯作者：
Y. Liu;Zheng‐Xiang Li;H. Li;L. Guo;W. Xu;L. Ye;C. Li;D. Pi
华北克拉通中生代A型花岗岩的成因：I型岩浆的高度分异？
影响因子：
3.5
作者：
Liu, Y.S.;Zhang, S.Q.;Zhou, W.G.;Jiang, N.
通讯作者：
Jiang, N.
影响因子：
3.5
作者：
Wei-dong Sun;Xiaoyong Yang;W. Fan;Fu-Yuan Wu
通讯作者：
Wei-dong Sun;Xiaoyong Yang;W. Fan;Fu-Yuan Wu
华南珊瑚矿田晚白垩世钨锡矿化锆石U-Pb和白云母40Ar-39Ar精密年代学新成果
影响因子：
3.3
作者：
Yongfeng Cai;Zuohai Feng;Tongbin Shao;Rongguo Hu;Yun Zhou;Jifeng Xu
通讯作者：
Jifeng Xu
DOI：
--
发表时间：
2002
期刊：
--
影响因子：
--
作者：
W. Gang
通讯作者：
W. Gang