The Hot-Spring Genesis of the Shimen Realgar Deposit, Northwest Hunan

作     者：张景荣 王蔚 扬帆 蔡彤 

作者机构：Department of Earth Science Nanjing University Nanjing 210008 

出 版 物：《Chinese Journal Of Geochemistry》 (中国地球化学学报)

年 卷 期：1993年第12卷第2期

页      面：137-147页

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] 

主　　题：砷矿床 热泉 硅石 烧结 湖南 形成模式 

摘      要：The Shimen realgar deposit is characterized by the pipi-shaped orebody and the development of silica sinter and hydrothermal explosive breccia which are typical of hot spring *** similar trace-element associations are noticed between the silica cap and the breccia and modern hot spring waters in the *** chemistr of ore-forming solutions is also well comparable with that of modern hot spring.,The spring system that gave rise to the mineralization was charged by ground waters heated through thermal conducting systems in the deep crust and,to a lesser extent,by geothermal gradient.ΔD,δ^18O,δ^13CCH4andδ^13CH4andδ^13CCO2values and ^40Ar/^36Ar and 3^He/^4He ratios indicate that the spring system is of crustal *** ore-forming metals were supplied by surrounding strata,particularly those underlying the ore *** mechanim of ore deposition is thought to be hydrothermal explosion and accompanying boiling and abrupt changes in pH and *** in northwest Hunan,the Shimen realgar deposit is the leading arsenic producer in the country,However,regardless of its long mining history,the genesis of this deposit has long been a *** was considered to be postmagmatic epithermal in the leading arsenic producer in the *** Was considered to be postmagmatic epithermal in origin,but this is trongly challenged by filling(metasomatism)in karst environment proposed later by Zhou Zhiquan(1986)also encounters a number of *** example,why can the pipi-shaped orebody vertically extend up to several hundreds meters without any compatible development in the lateral dimension? A hot spring genesis is suggested in the present paper based on geological observations and laboratory studies conducted by the authors in recent years.