Characteristics of Some Selenides and the Physical-Chemical Condition of Selenides and Tellurides in the Jílové Gold Metallogenic Concentration Area, Czech Republic
详细信息
- 责任者：Liu Jiajun (State Key Laboratory of Geological Processes and Mineral Resources ; School of Earth Sciences and Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Yang Longbo
- 刊名：Earth Science Frontiers
- 出版年：2013
- 卷期：20(1)
- 关键词：金矿 ; gold ores ; 硒化物矿物 ; selenides ; 捷克 ; Czech Republic
- 页码：p.166-181
- 图表：illus., 3 tables, 20 refs.
- 分类号：1001
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
The Jílové gold metallogenic concentration area situated about 25 km south of Prague,Czech Republic belongs to the most important historical gold-bearing district in the Bohemia Massif with tradition of gold mining over 2000 years,intensively mined in the past,mainly during the Middle Ages.The important gold deposits include the Peprˇ,Bohuliby,Radlík and Rotlev.They exist mainly in the Upper Proterozoic volcano-sediment of the těchovice Group and the granodiorite of the Central Bohemian Pluton.There are three types of gold mineralization in the Jílovégold metallogenic concentration area: veins,stockworks,impregnation.Up to now,more than 70 minerals have been identified.They include not only sulfides and sulfosalts of Cu,Pb,Zn,Fe,As,Mo,Bi,Hg,Au,and Ag-bearing minerals,a variety of oxide,hydroxide,sulfate,carbonate,tungstate and silicate minerals but also telluride,halide,and native metals.Examination of ores by optical microscope,electron probe,X-ray surface scanning,has revealed that there are some selenides in the deposits.The diversity of mineral species in the ores and the occurrence of visible native gold minerals are the outstanding features of the gold deposit.Generally speaking,the more robust correlation is with the chalcogenidic environment and,in most cases,the lesser correlation with specific minerals.Therefore,the highly enrichment of selenide and telluride in the deposits is very characteristic,reflecting a specific condition of their formation.In the early stage of mineralization,f(Se2),f(Te2) and f(O2) are relatively low while f(S2) is relatively high,with f(S2)/f(Se2)>1 and f(S2)/f(Te2)>1.In this circumstance,sulfur would be precipitated as sulfides while selenium and tellurium would tend to be trapped in the sulfides as isomorphous admixture.Therefore,the minerals are characterized by the association of pyrite,marcasite,pyrrhotite,arsenopyrite,chalcopyrite,galenite,sphalerite and so on.In the late stage of mineralization,f(Se2),f(Te2),and f(O2) are relatively high while f(S2) is relatively low,with f(S2)/f(Se2)<1 and f(S2)/f(Te2)<1.In the main stage of mineralization,f(Se2)/f(S2),f(Te2)/f(S2) and f(O2) would increase with the precipitation of sulfides,which would favor the formation of selenides and tellurides.According to the mineral associations of selenide and telluride,we obtain that 10-14.97