Geology and mineralization of the Dongping supergiant alkalic-hosted Au-Te deposit(>100 t Au)in Northern Hebei Province,China:A review  

作　　者：Shi-min Zhen Da-zhao Wang Zhong-jian Zha Hai-jun Bai Jiang Wang 

机构地区：[1]Development and Research Center of China Geological Survey,Ministry of Natural Resources,Beijing 100037,China [2]Technical Guidance Center for Mineral Resources Exploration,Ministry of Natural Resources,Beijing 100037,China [3]State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China [4]Institute of Geological Surveying and Mapping Technology of Anhui Province,Hefei 230022,China [5]Third Geological Brigade of Hebei Bureau of Geology and Mineral Resources,Zhangjiakou 075000,China [6]Ulanqab Real Estate Registration Center,Ulanqab 012099,China

出　　处：《China Geology》2024年第3期533-550,共18页中国地质（英文）

基　　金：financially supported by the project of the China Geological Survey(DD20230292,DD20242591)。

摘　　要：The Dongping deposit is the largest alkalic-hosted gold deposit in China containing>100 t of Au.This paper presents a new understanding for Dongping ore system,based on the previous studies.The mineralization originally occurred at 400-380 Ma,simultaneous with emplacement of the Shuiquangou alkaline complex,and was overprinted by the hydrothermal activity in the Yanshanian.Isotope compositions of ores indicate metals of the deposit are mainly provided by the Shuiquangou complex.Ore-forming fluids are characterized by increasing oxygen fugacity and decreasing sulfur fugacity,while tellurium fugacity increased in the Stage II-2 and decreased in Stage II-3.These systematic changes are closely related to the processes of mineral precipitation and fluid evolution.Sulfide precipitation from Stage Ⅰ to Stage Ⅱ was triggered by fluid boiling,which leads to the precipitation of Pb-Bi-Te,due to decrement of sulfur fugacity.Condensation of gas phase containing high concentration of H_2Te leads to precipitation of Te-Au-Ag minerals and native tellurium.Based on these hypotheses,this paper present a polyphase metallogenic model as follow.During the Devonian,fluids were released from alkaline magmas,which carried ore-forming materials form the surrounding rocks and precipitate the early ores.During the Jurassic-Cretaceous,fluorine-rich fluids exsolved from highly factionated Shangshuiquan granite,which extracted and concentrated Au from the Shuiquangou complex and the Sanggan Group metamorphic rocks,and finally formed the Dongping gold deposit.

关 键 词：Mineralization and alteration Alkaline intrusion Au deposit Physicochemical conditions Metallogenic model Oxygen fugacity Sulfur fugacity Mechanisms of mineral precipitation Fluid boiling Fluorine-enriched fluid Dongping gold deposit North China Craton Mineral exploration engineering 

分 类 号：P618.51[天文地球—矿床学]