Genesis of the Taishanmiao Au Deposit in the Ningshan-Zhenan Ore Field,South Qinling Orogen,China:Evidence from Geochemical,Geochronological and S-Pb-H-O Isotopical Study  

作　　者：GAO Zuoyu LIU Yunhua SUN Naiquan LI Yuntao LI Bo 

机构地区：[1]School of Earth Science and Resources,Chang’an University,Xi’an 710054,China [2]School of Geological and Surveying&Mapping Engineering,Chang’an University,Xi’an 710054,China [3]No.9 Geological Brigade of Xinjiang Bureau of Geo–exploration and Mineral Development,Urumqi 810000,China [4]College of Earth Sciences,Guilin University of Technology,Guilin,Guangxi 541004,China

出　　处：《Acta Geologica Sinica(English Edition)》2022年第3期993-1009,共17页地质学报（英文版）

基　　金：This research was funded by the National Natural Science Foundation of China(Grant No.41872219);Key Research and Development Program of Shaanxi[2019SF-245];Integrated Research Project of Integrated Exploration of China Geological Survey[WKZB1911BJM300369/002];China Geological Survey Program,and Ministry of Natural Resources(Grant No.DD20179607);Fundamental Research Funds for the Central Universities,CHD(Grant No.300102271722).

摘　　要：The Taishanmiao Au deposit is in the western part of the Ningshan-Zhenan ore field,in the South Qinling orogen.Based on geological and geochemical features,we propose that the Taishanmiao Au deposit is a magmatichydrothermal type of deposit.All samples have high SiO_(2),K_(2)O+Na_(2)O contents and differentiation index values,low CaO,MgO,P_(2)O_(5),and TiO_(2)contents,are enriched in high field-strength elements,and depleted in large ion lithophile element.The stable isotopeδ^(34)S values of pyrite vary from 6.8%-7.8%,and the H-O isotopic compositions of quartz from quartzpyrite veins indicate the ore-forming fluid is a mixture of a small amount of magmatic-hydrothermal solution and groundwater.Lead isotope ratios of pyrite and silicalite can show that the ore-forming materials were derived from a mixed source containing mantle and crustal materials.At the same time,the LA-ICP-MS U-Pb dating of monzogranite is 198.4±4.2 Ma.Combined with the regional geological background,the intracontinental extension in the late collisional orogeny and large-scale lithospheric thinning associated with mantle uplift may lead to large-scale mineralisation in the region.

关 键 词：stable isotope METALLOGENY quartz-pyrite veins collisional orogeny South Qinling Orogen 

分 类 号：P618.51[天文地球—矿床学]