文献类型：期刊文献

英文题名：Two Hydrothermal Events at the Shuiyindong Carlin-Type Gold Deposit in Southwestern China: Insight from Sm-Nd Dating of Fluorite and Calcite

作者：Tan, Qinping Xia, Yong Xie, Zhuojun Wang, Zepeng Wei, Dongtian Zhao, Yimeng Yan, Jun Li, Songtao

第一作者：Tan, Qinping

通信作者：Tan, QP[1];Xia, Y[1]

机构：[1]Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Guizhou, Peoples R China;[2]Guizhou Bur Geol & Mineral Explorat & Dev, Geol Team 105, Guiyang 550018, Guizhou, Peoples R China;[3]Guilin Univ Technol, Coll Earth Sci, Guangxi Key Lab Explorat Hidden Metall Ore Deposi, Guilin 541006, Peoples R China;[4]Univ Chinese Acad Sci, Beijing 100039, Peoples R China;[5]Guizhou Inst Technol, Coll Resources & Environm Engn, Guiyang 550003, Guizhou, Peoples R China

第一机构：Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Guizhou, Peoples R China

通信机构：corresponding author), Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Guizhou, Peoples R China.

年份：2019

卷号：9

期号：4

外文期刊名：MINERALS

收录：;Scopus(收录号：2-s2.0-85067013399);WOS:【SCI-EXPANDED(收录号:WOS:000467748800031)】；

基金：This work was financially supported by the National Key R&D Program of Deep penetrating Geochemistry (2016YFC0600607) and the National Natural Science Foundation of China (41803046).

语种：英文

外文关键词：Sm-Nd dating; Shuiyindong; Carlin-type gold deposit; Southwestern China

摘要：The Shuiyindong Gold Mine hosts one of the largest and highest-grade, strata-bound Carlin-type gold deposits discovered to date in Southwestern China. The outcrop stratigraphy and drill core data of the deposit reveal Middle-Upper Permian and Lower Triassic formations. The ore is mainly hosted in Upper Permian bioclastic limestone near the axis of an anticline. The gold is mainly hosted in arsenian pyrite and arsenopyrite, mainly existing in the form of crystal lattice gold, submicroscopic particles and nanoparticles. Fluorite commonly occurs at the vicinity of an unconformity between the Middle-Upper Permian formations, which is proposed to be the structural conduit that fed the ore fluids. Calcite commonly fills fractures at the periphery of decarbonated rocks, which contain high grade orebodies. This study aimed to verify the occurrence of two distinct hydrothermal events at the Shuiyindong, based on Sm-Nd isotope dating of the fluorite and calcite. For this purpose, rare-earth element (REE) concentrations, Sm/Nd isotope ratios, and Sm-Nd isochron ages of the fluorite and calcite were determined. The fluorite and calcite contain relatively high total concentrations of REE (12.3-25.6 g/g and 5.71-31.7 g/g, respectively), exhibit variable Sm/Nd ratios (0.52-1.03 and 0.57-1.71, respectively), and yield Sm-Nd isochron ages of 200.1 +/- 8.6 Ma and 150.2 +/- 2.2 Ma, with slightly different initial epsilon Nd(t) values of -4.4 and -1.1, respectively. These two groups of Sm-Nd isochron ages suggest two episodes of hydrothermal events at the Shuiyindong gold deposit. The age of the calcite probably represents the late stage of the gold mineralization period. The initial epsilon Nd(t) values of the fluorite and calcite indicate that the Nd was probably derived from mixtures of basaltic volcanic tuff and bioclastic limestone from the Permian formations.