Pyrite Concretions in the Lower Cambrian Niutitang Formation,South China:Response to Hydrothermal Activity

作     者：Zixuan Liu Detian Yan Xing Niu Zixuan Liu;Detian Yan;Xing Niu

作者机构：Key Laboratory of Tectonics and Petroleum ResourcesMinistry of EducationChina University of GeosciencesWuhan 430074China School of GeosciencesYangtze UniversityWuhan 434023China 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：2023年第34卷第4期

页      面：1053-1067页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：supported by the National Natural Science Foundation of China (No.42002148) the Program of Introducing Talents of Discipline to Universities (No.B14031) the Open Fund of the Key Laboratory of Tectonics and Petroleum Resources,Ministry of Education,China University of Geosciences (Nos.TPR-2021-10,TPR-2022-21) 

主　　题：shale pyrites black shale pyrite concretion depositional environment. 

摘      要：The Early Cambrian Niutitang Formation is characterized by wide distribution of black shales on Yangtze Block,South *** we have reported the pyrite concretions in the bottom of the Niutitang Formation deposited in the slope-basin environment of Yangtze *** pyrite concretion was mainly composed of pyrite associated with hydrothermal minerals(barite,hyalophane,tetrahedrite),followed by quartz and organic *** elements Mo and U displayed significant enrichment(enrichment factors 10),indicating the euxinic bottom water ***,Ni,and excess Ba concentrations were relatively high,denoting high primary ***-situ sulfur isotope compositions of pyrite concretions δ34Spy) showed little variations(13.2‰–19.4‰) and small fractionations compared to coeval seawater δ*** and geochemical analyses indicated the pyrite concretions were formed in the sediment-water interface during the early diagenesis,with H2S diffusing from the euxinic water,and influenced by hydrothermal activity leading to the coexistence of barite,hyalophane,and *** results imply euxinic bottom water featured by high primary productivity and increasing riverine flux of sulfate from chemical weathering during the Early Cambrian.