黔中王家院磷矿床沉积特征及控矿作用  

Sedimentary Characteristics and Ore Control of Wangjiayuan Phosphate Deposit in Central Guizhou Province

作　　者：张明军 游家贵 ZHANG Mingjun;YOU Jiagui(Southwest Energy&Mineral Inc.)

机构地区：[1]西南能矿集团股份有限公司

出　　处：《现代矿业》2024年第7期37-43,共7页Modern Mining

基　　金：2021年贵州省重点矿产资源大精查项目(编号:黔自然资函[2021]412号)。

摘　　要：黔中陡山沱期沉积型磷矿床是全球大规模成磷事件的典型代表,但其沉积古地理与成矿作用的耦合关系尚不清楚。以王家院磷矿床为研究对象,在矿层地质特征研究的基础上,深入解剖陡山沱期的岩相古地理及控矿特征、成矿模式、找矿规律。研究表明,陡山沱组第一段对应海侵开始,形成一套以白云岩为主的岩石组合;陡山沱组第二段对应沉积的早期阶段,海侵扩大,大规模富磷海水汇集,致使浅滩上的沉积物转变为磷块岩,a矿层开始沉积;陡山沱组第三段代表了短暂且规模较小的海退事件,水动力条件减弱,海水中的磷元素逐渐减少;陡山沱组中晚期经历了短暂的海退及沉积间断后,发生水位更高的溶磷海侵,形成更大规模的陡山沱组第四段b矿层。The sedimentary phosphate deposit in the Doushantuo Period in central Guizhou Province is a typical example of large-scale phosphogenesis events globally.However,the connection between sedi⁃mentary paleogeography and mineralization remains unclear.Taking Wangjiayuan phosphate deposit as the research object,the lithofacies paleogeography,ore-controlling characteristics,metallogenic model and prospecting rule of Doushantuo Stage are dissected deeply on the basis of the study of geological characteris⁃tics of ore beds.The study shows that the first member of Doushantuo Formation corresponds to the beginning of transgression,forming a set of rock association dominated by dolomite.In the early stage of sedimenta⁃tion,the second member of Doushantuo Formation is enlarged by sea encroachment and a large scale accu⁃mulation of phosphorus-rich seawater,which caused the sediments on the shoals to change into phosphorite and the deposition of a deposit is began.The third member of Doushantuo Formation represents a short and small scale regressive event,with the weakening of hydrodynamic conditions and the gradual reduction of phosphorus in seawater.After the short retrograde and depositional discontinuous in the middle and late peri⁃od of Doushantuo Formation,a higher level of dissolved phosphorus transgression occurred,and a larger scale b deposit is formed in the fourth member of Doushantuo Formation.

关 键 词：地质找矿 磷矿 沉积特征 控矿作用 

分 类 号：P619.2[天文地球—矿床学]