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Garnet and Zircon U-Pb Geochronology and Geochemistry Reveal Genesis of the dafang Au-Pb-Zn-Ag Deposit,Southern Hunan

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Acta Geologica Sinica(English Edition) 2024年第3期98卷 717-735页

作者： JIANG Hua KONG Hua LIU Biao TAN Fucheng QIN Yixue HUANG Jingang ZHU Yu Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of EducationSchool of Geosciences and Info-PhysicsCentral South UniversityChangsha 410083China School of Geosciences and Info-Physics Central South UniversityChangsha 410083China Hunan Baoshan Nonferrous Metals and Minerals Co. Ltd.ChenzhouHunan 424402China

Garnet is a primary mineral in skarn deposits and plays a significant role in recording copious mineralization and metallogenic *** study systematically investigates the geochemistry and geochronology of garnet and zircon in the dafang Au-Pb-Zn-Ag deposit,which represents prominent gold mineralization in southern Hunan,*** samples with distinct zoning patterns and compositional variations were identified using various analytical techniques,including Backscattered Electron(BSE)imaging,Cathodoluminescence(CL)response,textural characterization,and analysis of rare-earth elements(REE),major contents,and trace element *** garnet was dated U-Pb dating,which yielded a lower intercept age of 161.06±1.93 *** age is older than the underlying granodiorite porphyry,which has a concordia age of 155.13±0.95 Ma determined by zircon U-Pb *** results suggest that the gold mineralization may be related to the concealed *** groups of garnet changed from depleted Al garnet to enriched Al garnet,and the rare earth element(REE)patterns of these groups were converted from light REE(LREE)-enriched and heavy REE(HREE)-depleted with positive europium(Eu)anomalies to medium REE(MREE)-enriched from core to rim *** different REE patterns of garnet in various zones may be attributed to changes in the fluid environment and late superposition *** development of distal skarn in the southern Hunan could be a significant indicator for identifying gold mineralization.

关键词： garnet and zircon U-Pb dating LA-ICP-MS mapping dafang Southern Hunan

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Status and Development Strategies of Grassland Agriculture: A Case Study of dafang County

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Asian Agricultural Research 2019年第6期11卷 15-19,24页

作者： Jiahai WU Wenzhong CHEN Feng XUE Xiaodong LI Jun XIONG Fen LOU Guangji CHEN Qiong MOU Defang People s Government Dafang 551600 China Guizhou Institute of Pratacultural Guizhou Academy of Agricultural Sciences Guiyang 550006 China Bijie Animal Husbandry and Fishery Bureau Bijie 551700 China Policy Research Office Dafang Party Committee Dafang 551600 China dafang Agriculture and Animal Husbandry Bureau Dafang 551600 China

In order to better promote the development of grassland husbandry in the Bijie experimental area and promote industrial poverty alleviation and rural revitalization strategies,the development status of grassland agriculture in developed countries( USA,Netherlands and France) and China is summarized. By learning from the successful experience of grassland agricultural development at home and abroad,combined with the survey results of grassland agriculture in dafang County of Bijie experimental area,the development of grassland agriculture in dafang County of Bijie experimental area is analyzed,and corresponding development strategies are put forward.

关键词： Development Grassland agriculture Rural revitalization Survey dafang Guizhou

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