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 magmatic-hydrothermal type of deposit.All samples have high SiO2,K2O+Na2O contents and differentiation index values,low CaO,MgO,P2O5,and TiO2 contents,are enriched in high field-strength elements,and depleted in large ion lithophile element.The stable isotope δ34S values of pyrite vary from 6.8％-7.8％,and the H-O isotopic compositions of quartz from quartz-pyrite 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.

GAO Zuoyu;LIU Yunhua;SUN Naiquan;LI Yuntao;LI Bo

School of Earth Science and Resources,Chang'an University,Xi'an 710054,China;School of Geological and Surveying&Mapping Engineering,Chang'an University,Xi'an 710054,China;No.9 Geological Brigade of Xinjiang Bureau of Geo-exploration and Mineral Development,Urumqi 810000,China;College of Earth Sciences,Guilin University of Technology,Guilin,Guangxi 541004,China

地质学报（英文版）

[1]GAO Zuoyu;LIU Yunhua;SUN Naiquan;LI Yuntao;LI Bo-.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)[J].地质学报（英文版）,2022(03):993-1009

Taishanmiao,Ningshan,Zhenan,Isotopical

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