宜昌磷矿田早震旦世陡山沱期磷块岩富集规律浅析

Study on the Enrichment of Phosphate Rocks in Doushantuo Period of Late Sinian in Yichang Phosphorus Ore Field

通过收集和分析宜昌磷矿田72处矿产地257个探矿工程的工业矿层厚度资料,浅析早震旦世陡山沱期磷块岩的富集规律。研究表明,宜昌磷矿田陡山沱组主要工业矿层在区域上呈NW向带状展布,矿层自南向北厚度变薄;富矿带分布趋势与工业矿层基本一致,聚磷层位向北部及东部逐步抬高变新;下磷层—中磷层由南向北迁移富集,构成海进沉积序列。

By collecting and analyzing the thickness data of industrial ore layers of 257 prospecting projects in 72 mineral deposits in Yichang phosphorus ore field,the enrichment law of phosphate rock in Doushantuo Period of Early Sinian is studied.The study shows that the main industrial ore layer of Doushantuo Formation in Yichang phosphorus ore field is NW-trending zonal distribution,and the thickness of ore bed becomes thinner from south to north.The distribution trend of the rich ore belt is basically consistent with the industrial ore layer,and the phosphorus accumulation layer is gradually uplifted and upgraded to the north and east.The lower phosphorus layer and middle phosphorus layer migrated and enriched from south to north,forming a marine sedimentary sequence.