New precise zircon U-Pb and muscovite 40Ar-39Ar geochronology of the Late Cretaceous W-Sn mineralization in the Shanhu orefield, South China
New precise zircon U-Pb and muscovite 40Ar-39Ar geochronology of the Late Cretaceous W-Sn mineralization in the Shanhu orefield, South China
复制标题
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
DOI：
10.1016/j.oregeorev.2017.01.022
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发表时间：
2017
影响因子：
3.3
通讯作者：
Jifeng Xu
中科院分区：
文献类型：
--
作者：
Yongfeng Cai;Zuohai Feng;Tongbin Shao;Rongguo Hu;Yun Zhou;Jifeng Xu
珊瑚矿田位于桂东北，是南岭地区钨锡多金属成矿的重要组成部分。珊瑚钨锡存款在空间上与盐田岭花岗岩共生。对盐田岭花岗岩进行LA-ICPMS锆石U-Pb定年，获得晚白垩世年龄分别为100.9 ± 2.2Ma和100.8 ± 2.3Ma。热液白云母40 Ar/39 Ar定年获得102.7 ± 1.7Ma和100.8 ± 0.7Ma的坪年龄。该年龄与盐田岭花岗岩的LA-ICPMS锆石U-Pb年龄吻合较好，表明钨锡成矿作用与花岗质岩浆活动存在时空联系。结合区域地质资料，认为南岭地区晚白垩世曾发生过一次与花岗质岩浆活动有关的成矿事件，可能是区域岩石圈伸展作用的结果。
The Shanhu orefield, located in the northeastern Guangxi province, is an important part of W-Sn polymetallic metallogeny in the Nanling region. The Shanhu W-Sn deposit is spatially associated with the Yantianling granite. LA-ICPMS zircon U-Pb dating of the Yantianling granite yields Late Cretaceous ages of 100.9 ± 2.2 Ma and 100.8 ± 2.3 Ma. Hydrothermal muscovite40Ar/39Ar dating yields plateau ages of 102.7 ± 1.7 Ma and 100.8 ± 0.7 Ma. This date coincides well with the LA-ICPMS zircon U-Pb age of the Yantianling granite, indicating a spatial-temporal link between the W-Sn mineralization and the granitic magmatism. In combination with regional geological data, it is suggested that a Late Cretaceous mineralization event related to granitic magmatism occurred in the Nanling region, which might have resulted from regional lithospheric extension.