贵州茶山坡硫铁矿地质特征及成矿机理

Geologic Characteristics and Metallogenic Mechanism of Chashanpo Pyrite Deposit in Guizhou Province

贵州茶山坡硫铁矿位于扬子准地台—黔南台陷—贵定SN向构造变形区北部之龙里复背斜西翼,含矿层位为中二叠统梁山组中下部黏土岩。基于茶山坡硫铁矿地质工作成果,分析了区域成矿地质背景、矿床地质特征,并进一步讨论了成矿机理。研究表明:(1)茶山坡硫铁矿的形成与地层、岩相、含煤岩系关系密切,矿床成因类型属煤系沉积型硫铁矿,矿床受控于地层、古风化壳和沉积环境;(2)矿层露头、岩性组合、铁帽及地层为有利找矿标志,此外,勘查区东南浅水露头附近,可见附于草木、岩石表面的黄褐色凝胶状物质,该类物质颜色较醒目且出露于矿体附近,也可作为硫铁矿的找矿标志;(3)矿区4~#、5~#、9~#线以南以及矿区周边的贵定复向斜西部、龙里箱状背斜东南部均有梁山组含矿地层分布,成矿条件、控矿因素与茶山坡硫铁矿区相似,找矿潜力较大。上述分析对于在该矿区及其邻区进一步开展硫铁矿找矿勘探工作有一定的参考价值。

Chashanpo pyrite deposit is located in the west wing of Longli anticlinorium of the north of Yangtze paraplatform platform collapse of Southern Guizhou platform subside and SN-trending Guiding tectonic deformation zone,which ore-bearing layer is the clay rock of supper Langshan formation of Middle Permian period. Based on the geological working results of Chashanpo pyrite mining area,the regional metallogenic geological background and geological characteristics of the deposit are analyzed,besides that,metallogenic mechanism of the deposit is also discussed in detail. The study results show that：（1）the formation of Chashanpo pyrite deposit is closely related to the factors of strata,lithofacies and coalbearing rock series,the deposit genesis is belongs to the coal series depositional pyrite deposit,and the deposit is controlled by the factors of strata,ancient weathering crust and sedimentary environment;（2）seam outcrop,lithologic combination,iron cap and strata are the favorable prospecting indicators of the deposit,besides that,the tawny gelatinous substance distributed near the shallow water outcrop in the southeast of prospecting area in the mining area and attached to the vegetation and rock surface,their color is marked and they are formed near the ore-bodies,so,they can also be regarded as the favorable prospecting indicator of the deposit;（3）Liangshan formation ore-bearing stratum are distributed in the south area of 4#、5#、9#line,and the south of Guiding synclinorium,southeast of Longli box-shaped antiline,which metallogenic condition and ore-controlling factors are similar to the ones of Chashanpo mining area,the prospecting potential of the above areas is huge. Thea above discussion results of the geological characteristics and metallogenic mechanism of Chashanpo pyrite deposit in Guizhou Province can provide some reference for conducting further geological prospecting and exploration in the mining area and its adjacent areas.