云南华坪基度大理岩矿床地质特征及成因分析

Geological Characteristics and Genesis Analysis of Jidu Marble Deposit in Huaping County,Yunnan Province

基度大理岩矿床位于扬子陆块盐源—丽江被动陆源北部,构造不甚发育,岩浆活动强烈,变质作用微弱。通过对区域地质背景、矿区地质特征的分析,厘定了矿床地质特征及成因。矿区共圈定2个大理岩矿体,赋矿层位为二叠中统阳新组,矿体规模大、厚度稳定,发育瓷白大理石、米黄大理石及银灰大理石。结合矿床成矿地质条件、矿石矿物特征等,认为矿床属海相化学、生物沉积型大理岩矿床,含矿层北东延伸方向具有较大的找矿潜力。

The Jidu marble deposit is located in the northern part of the Yanyuan-Lijiang passive continental source of the Yangtze block.The structure is not well developed,the magmatic activity is strong,and the metamorphism is weak.Through the analysis of regional geological background and geological characteristics of the mining area,the geological characteristics and genesis of the deposit are determined.Two marble ore bodies are delineated in the mining area.The ore-bearing strata are the Yangxin Formation of the Middle Permian.The ore body is large in scale and stable in thickness.Porcelain white marble,beige marble and silver gray marble are developed.Combined with the metallogenic geological conditions and ore mineral characteristics of the deposit,it is considered that the deposit belongs to marine chemical and biological sedimentary marble deposit,and the ore-bearing layer has great prospecting potential in the northeast extension direction.