贵州罗甸地区玉石矿含矿变质岩带地质特征及其找矿意义

Geological Characteristics and Prospecting Significance of Ore-bearing Metamorphic Rock Belt of Jade Ore in Luodian Area,Guizhou Province

在总结以往贵州罗甸地区玉石矿成矿理论研究成果的基础上,对含矿变质岩带的地质特征与玉石成矿的相关性进行研究和总结,促进该区地质找矿。通过对含矿变质岩带厚度、裂隙发育情况、变质矿物组合特征、岩体和变质岩带MgO的含量以及玉石矿产出的情况进行分析,认为含矿变质岩带厚度在30~50 m,发育少量裂隙;辉绿岩体MgO含量相对偏低,而变质岩带MgO含量相对偏高;变质矿物硅灰石含量少,仍夹有硅质岩或大理岩化灰岩的变质岩带产出玉石矿概率较高。

On the basis of summarizing the previous research results of jade mineralization theory in Luodian area of Guizhou,the correlation between geological characteristics of ore-bearing metamorphic rock belt and jade mineralization is studied and summarized to promote geological prospecting in this area.Through the analysis of the thickness of the ore-bearing metamorphic rock zone,the development of fractures,the characteristics of metamorphic mineral assemblages,the content of MgO in the rock mass and metamorphic rock zone,and the situation of jade mineral production,it is considered that the thickness of the ore-bearing metamorphic rock zone is 30~50 m,and a small number of fractures are developed.The MgO content of diabase is relatively low,while the MgO content of metamorphic rock belt is relatively high.The metamorphic mineral wollastonite content is low,and the metamorphic rock belt with siliceous rock or marbleized limestone still has a high probability of producing jade ore.