Temporal evolution,tectonic exhumation and preservation potential of the giant Zaozigou Au deposit in West Qinling Orogen,China  

作　　者：Fan YANG Gilby JEPSON Leon BAGAS Jiarun TU Cun ZHANG Rui ZHU Junfeng SHEN 

机构地区：[1]Key Laboratory of Mineral Resources in Western China(Gansu Province),School of Earth Sciences,Lanzhou University,Lanzhou,730000,China [2]School of Geosciences,University of Oklahoma,Oklahoma,73019,USA [3]Xi’an Center of Geological and Mineral Resources,China Geological Survey,Xi’an,710054,China [4]Tianjin Center,China Geological Survey,Tianjin,300170,China [5]School of Materials Science and Engineering,Qilu University of Technology(Shandong Academy of Sciences),Jinan,250353,China [6]Zaozigou Gold Company,Zhaojin Mining Industry Co.,Ltd.,Hezuo,747000,China [7]School of Earth Sciences and Resources,China University of Geosciences,Beijing,100083,China

出　　处：《Science China Earth Sciences》2025年第4期1158-1179,共22页中国科学(地球科学英文版)

基　　金：jointly supported by the National Natural Science Foundation of China(Grant Nos.42202077,42473029);the Natural Science Foundation of Gansu Province(Grant Nos.22JR5RA440,20JR10RA630);the Fundamental Research Funds for the Central Universities(Grant No.LZUJBKY-2022-42);the Guiding Special Funds of“Double First-Class(First-Class University&First-Class Disciplines)”of Lanzhou University,China(Grant No.561119201)。

摘　　要：The study of metallogeny includes origin,development,modification,and preservation of mineralisation.The understanding of temporal evolution,and post-mineralisation modification and preservation of mineralisation are vital for building metallogenic theory and mineral prospecting,but they remain poorly understood and controversial.The Zaozigou deposit is the largest Au deposit in the West Qinling Orogen of central China with a resource of 142 t Au,and offers an excellent opportunity for deciphering the post-mineralisation exhumation and preservation of Au deposit in orogens.Here,we present integrated results from zircon U-Pb(ZUPb),apatite U-Pb(AUPb),apatite fission-track(AFT)and apatite(U-Th-Sm)/He(AHe)dating,thermal history modelling,biotite thermobarometer,and pyrite thermoelectricity of the deposit.The aims of the study are to decipher the temporal history,and post-mineralisation tectonic evolution and exhumation,and to evaluate the degree of exhumation and preservation potential of the deposit.Integrating the newly determined ZUPb(ca.242–238 and 218–201 Ma),AUPb(ca.247–235 Ma),AFT(ca.237–186 Ma),and AHe(ca.131–52 Ma)ages with multiple geo-thermochronological dates published from the Zaozigou deposit,major magmatic and hydrothermal events are recognised during ca.250–233 and230–203 Ma,with two Au mineralisation being deposited at ca.230 and 211 Ma.The Zaozigou area underwent rapid postmagma cooling during ca.250–228 Ma,rapid hydrothermal cooling at ca.219–211 Ma,and episodic post-Triassic cooling pulses.Thermal history modelling indicates rapid cooling at ca.210–170 Ma,slow reheating at ca.170–60 Ma,and enhanced cooling during ca.60–35 and 20–9 Ma at the Zaozigou deposit.In conjunction with the Triassic to Cenozoic tectonic evolution of the West Qinling Orogen,the ca.250–233 Ma magmatism,ca.230 Ma Au mineralisation,and ca.250–228 Ma rapid postmagma cooling are related to the northward subduction of the Mianlue Ocean(Paleo-Tethys Ocean).The ca.211 Ma Au mineralisation and rapid hydr

关 键 词：Geo-thermochronology Thermal history modelling Pyrite thermoelectricity Exhumation and preservation Zaozigou Au deposit West Qinling Orogen 

分 类 号：P618.51[天文地球—矿床学]