赣东北某大理石矿矿床地质特征及成因分析

Geological Characteristics and Genesis Analysis of a Marble Deposit in Northeast Jiangxi

以赣东北某大理石矿床矿体为研究对象,在分析矿区地质资料的基础上,结合矿区构造、地层、蚀变等野外地质调查及样品测试分析结果,系统讨论了矿区地质特征。矿体赋存于震旦纪兰田组中段原岩为盆湖相沉积的地层中,分析得出找矿标志有震旦纪兰田组中段的大理岩;岩浆岩与灰岩的外接触带;结构较均匀、结晶程度较高,矿物颗粒较粗大的均匀块状、条带状构造的灰白色大理岩。通过找矿标志可向外围突破,扩大矿山储量。经综合分析,本大理石矿经后期的构造运动和沉积变质作用形成,属沉积变质作用大理石矿床,为后续大理石矿床勘探提供依据。

This paper takes a marble deposit ore body in northeastern Jiangxi as the research object.Based on the analysis of the geological data of the mining area,combined with the field geological survey and sample test analysis results of the structure,strata and alteration of the mining area,the geological characteristics of the mining area are systematically discussed.The ore body occurs in the stratum where the original rock in the middle section of the Sinian Lantian Formation is basin-lacustrine deposits.The analysis shows that the prospecting mark is the marble of the middle section of the Sinian Lantian Formation;the outer contact zone of magmatic rock and limestone;the structure is relatively uniform,the gray-white marble with a high degree of crystallinity,coarser mineral particles and uniform massive,striped structure can break through to the periphery through the prospecting mark,and expand the mine reserves.After comprehensive analysis,this marble mine was formed by tectonic movement and sedimentary metamorphism in the later period,and belongs to the sedimentary metamorphic marble deposit,which provides a basis for subsequent exploration of the marble deposit.