黔西北地区方解石矿矿床地质特征及找矿前景探讨

Discussion on the geological features and prospecting prospect of calcite deposit in northwest Guizhou

对黔西北地区方解石矿床地质、岩石学和元素地球化学特征进行研究以分析其找矿前景,区内3处矿床分布18条规模不等的矿体,矿石以方解石矿物为主,含少量的白云石和萤石,呈自形-半自形结构,块状、脉状、网脉状构造,与围岩呈突变接触关系;矿石以Ca元素含量为主,其次为Mg、Si、Fe、Al,白度值较低。矿区内矿体严格受构造控制,以北东、北北东向构造为主要控矿构造;矿体主要赋存于二叠系栖霞组和茅口组内,具层控特征。类比认为赫章双坪乡、水塘、妈姑和威宁盐仓一带具有较好的方解石矿找矿前景。

In this paper,the geological,petrological and element geochemical characteristics of calcite deposit are studied to analyze its prospecting prospect in northwest Guizhou.There are 18 ore bodies of different sizes distributed in 3 deposits.The ore is mainly composed of calcite minerals and contains a small amount of dolomite and fluorite.It has an idiomorphic and semi-idiomorphic structure,massive,vein-like and reticular structure,and has a sudden contact relationship with the surrounding rock.The content of calcium is the main element,followed by Mg,Si,Fe,and Al,with a low whiteness value.The ore bodies is strictly controlled by NE and NNE trending structure and is the main ore-controlling structure,and mainly occur in the Permian Qixia and Maokou Formations and have stratified characteristics.By analogy,it is concluded that the area of Hezhang Shuangping Township,Shuitang,Magu and Weining Yancang have better prospecting prospects for calcite deposit.