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

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外文摘要：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 H2Te 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.

外文关键词：

Mineralization and alterationAlkaline intrusion Au depositPhysicochemical conditionsMetallogenic modelOxygen fugacitySulfur fugacityMechanisms of mineral precipitationFluid boilingFluorine-enriched fluidDongping gold depositNorth China CratonMin

作者：

Shi-min Zhen、Da-zhao Wang、Zhong-jian Zha、Hai-jun Bai、Jiang Wang

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作者单位：

Development and Research Center of China Geological Survey,Ministry of Natural Resources,Beijing 100037,China

Technical Guidance Center for Mineral Resources Exploration,Ministry of Natural Resources,Beijing 100037,China

State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China

Institute of Geological Surveying and Mapping Technology of Anhui Province,Hefei 230022,China

Third Geological Brigade of Hebei Bureau of Geology and Mineral Resources,Zhangjiakou 075000,China

Ulanqab Real Estate Registration Center,Ulanqab 012099,China

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基金：

project of the China Geological Surveyproject of the China Geological Survey

项目编号：

DD20230292DD20242591

出版年：

2024

DOI：

10.31035/cg2023097

中国地质(英文)

中国地质调查局,中国地质科学院

中国地质(英文)

CSTPCD

ISSN：2096-5192

年,卷(期)：2024.7(3)