广西平南县马安肚稀土矿床地质特征及成矿规律

Geological characteristics and mentallogenetic regularity of Ma'andu REE deposit in Pingnan Country of Guangxi

广西平南县马安肚稀土矿是位于南岭成矿带六万大山凸起的北东部的风化壳离子吸附型矿床。为在该地区更好的找寻勘探同类型矿床,对马安肚稀土矿床开展研究。在总结矿床地质特征的基础上,重点从矿化富集规律以及控矿因素对该矿床的成矿规律进行研究。结果表明,矿体赋存在六陈岩体黑云母钾长花岗岩的风化壳中,矿体所赋存的风化壳大片连续,矿体随着地貌形态起伏,从山顶到山脚,矿体一般由厚变薄,品位也随之变低,风化壳越厚越完整,解离程度越好的地段矿体质量越好等,并认为矿床的形成受母岩稀土丰度、气候、稳定构造环境等因素影响,矿体的形态与品位受地貌和风化壳厚度、pH值、矿物解离程度等控制。并以此建立了找矿标志。研究成果可为该区及同类型矿床的找矿工作提供参考。

Ma'andu REE deposit in Pingnan County,Guangxi is a weathering crust ion adsorption deposit located in the northeast part of the Liuwandashan uplift in the Nanling metallogenic belt.In order to better explore for the same type deposit in this area,Ma'andu REE deposit is studied.On the basis of summary of the geological characteristics of the deposit,the metallogenic regularity of the deposit is studied from the mineralization enrichment regularity and the ore-controlling factors.The result shows that the ore body occurs in the weathering crust of biotite K-feldspar granite in Liuchen rock mass.The weathering crust of the ore body is large and continuous.The ore body fluctuates with the topography.From the top to the foot of the mountain,the ore body generally changes from thick to thin,and the grade also decreases.The thicker and more complete the weathering crust is,the better the quality of the ore body in the area with better dissociation degree is.It is considered that the formation of the deposit is affected by the rare earth abundance of the parent rock,climate,stable tectonic environment and other factors.The shape and grade of the ore body are controlled by landform and weathering crust thickness,pH value,mineral dissociation degree and so on.And the prospecting criteria are established.The research result can provide a reference for the prospecting work of this area and the same type deposit.