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上宫金矿床为一典型的构造蚀变岩型金矿床,围岩蚀变强烈。文章从矿床地质特征、蚀变分带及蚀变岩石的元素含量特征研究入手,并对蚀变过程中常量元素的迁移规律进行了探讨。研究表明,熊耳群及太华群的围岩蚀变横向分带较明显,由矿体中心向外侧依次为含金硫化物—(铁白云石)—绢云母—硅化带(Ⅰ带)→弱绿泥石—绢云母—(钾化)—铁白云石化带(Ⅱ带)→弱铁白云石(弱钾化)—绿泥石化带(Ⅲ带);蚀变岩中常量元素Ca O、K_2O、SiO_2、MgO、MnO等的带入及Na_2O明显带出规律,表明矿化蚀变与铁白云石化、钾长石化、绢云母化、绿泥石化等密切相关。蚀变特征研究为揭示矿化蚀变过程中元素的迁移机制提供了重要线索。
The Shanggong gold deposit is a typical tectonic altered rock type gold deposit, with strong alteration of the surrounding rock. In this paper, the geological characteristics of the deposit, the alteration zoning and alteration of rock element content characteristics of the start of the study, and the alteration of the process of the constant element migration were discussed. The results show that the lateral zonation of wall rock alteration in Xiong’er Group and Taihua Group is obvious, and the order from the ore body center to the outer side is gold sulfide - (iron dolomite) - sericite - silicification zone (Ⅰ) → weak Chlorite - (kalium) - iron dolomitization zone (Ⅱ zone) → weak iron dolomite (weak kaliumization) - chloritization zone (Ⅲ zone); and the constitutive elements CaO, K_2O , SiO 2, MgO and MnO, and Na 2 O evidently brought out the law, indicating that mineralization alteration is closely related to iron dolomitization, potassium feldspathization, sericitization and chloritization. The study of alteration features provides important clues for revealing the mechanism of element migration during mineralization alteration.