湖北省恩施州东部硒矿成矿条件与成矿预测

THE METALLOGENIC CONDITION AND ITS PROGNOSIS OF SELENIUM DEPOSIT IN EAST ENSHI STATE OF HUBEI PROVINCE

湖北省恩施自治州东部为我国著名的高硒地区。在其5个含硒层位中,下二叠统茅口组碳质硅质岩段硒浓集系数最高。该岩段可划分为三个岩性段,又以中部Ⅱ岩段最好,下部1岩段次之。含硅质碳质页岩与含碳质硅质岩构成的互层韵律矿化最好,而其前者,硒含量又高于后者。硒矿床具典型的层控矿床,其富集程度与氧化淋滤作用密切相关。经研究,恩施东部可圈划出沙地、新塘、双河、红土、石窑5个找矿远景区。

It is the famous area of the east Enshi state of Hubei Province which is abound of high content of Selenium minerals, among 5 Seleuim bearing horizon, the carbonate siliceous rocks of Makou formation of the later Permian Series with the highest concentration coefficient, it is divided into three lithology member and the middle part with the highest Selium concentration coefficient, the bottom part takes the second place, the carbonaceous siliceous .rocks and siliceous carbonaceous shale altemating beds ,the rhythmic layering with the good mineralization. The selenium deposit is typical Strata-bound mineral deposit, the concentration degree is related with the oxidation and eluviation, according to the study, it is circled 5 districts for prospecting in the east of the Enshi area,which are Shadi,Xintang,Shuanghe,Hongtu,Shiyao.