河南渑池地区重晶石矿床地质特征及矿床成因

Geological characteristics and genesis of barite deposits in Mianchi area,Henan Province

渑池地区重晶石矿成矿地质条件较好,该地区重晶石矿床多分布于中元古界熊耳群马家河组安山岩,汝阳群云梦山组砂岩、页岩中,明显受断裂控制,围岩具显著的热液蚀变特征,属热液充填型重晶石矿床。本文通过研究渑池地区数个重晶石矿床详实的第一手地质勘查成果资料,总结提出了渑池地区重晶石矿床的地质特征、找矿标志,并对矿床成因进行了探讨。笔者认为渑池地区地层、构造和岩浆岩构成了“三位一体”的控矿机制,该地区的重晶石矿床(点)分布较多且密集,矿体埋藏较浅,矿石品位较高,具有寻找重晶石矿的较好找矿前景。本文研究成果对渑池地区及外围寻找重晶石矿床具有一定的指导意义。

The Barite deposits in the Mianchi County area are mainly distributed in the andesite of the majiahe formation of the Middle Proterozoic Xiong’er group and in the sandstone and shale of the Yunmengshan formation of the Ruyang group,the wall rock has obvious hydrothermal alteration and belongs to hydrothermal filling barite deposit.On the basis of the first-hand detailed geological exploration data of several barite deposits in the Mianchi County area,this paper puts forward the geological characteristics and prospecting criteria of barite deposits in the Mianchi County area,and discusses the genesis of the deposits.The author thinks that strata,structures and magmatic rocks of the Mianchi County area constitute a‘Trinity’ore-controlling mechanism.Barite deposits(occurrences)in the area are more numerous and dense,with shallow ore bodies and high ore grades,there is a good prospecting prospect for barite in the Mianchi County area.This study has some guiding significance for the exploration of Barite deposits in the Mianchi County area and its periphery.