京、津、唐地区中元古代沉积型海泡石粘土矿床

MIDDLE PROTEROZOIC SEDIMENTARY SEPIOLITE DEPOSITS IN THE REGION OF BEIJING,TIANJING AND TANGSHAN

京、津、唐地区沉积型海泡石粘土矿分布广泛。含矿岩系为蓟县系雾迷山组富镁碳酸盐岩，区域构造简单，岩浆活动微弱。研究成果表明：本区海泡石粘土矿矿点多，储量丰富，矿层厚度大，埋藏浅，易开采。矿石矿物组合简单，化学成分富镁钙低硅，物理－化学性能优良。经选矿试验海泡石粘土矿可选性良好，回收率高，成本低廉，开发前景可观。

here is a wide distribution in the region of Beijing,Tianjing and Tangshan sedimentary sepiolite deposits which occur in the magnesium rich Carbonates of the Wumishan group of the middle Proterozic Jixian series.The geological structures of the region is simple with only weak magmatism.Investigations show abundant sepiolite deposits of occurrences in the region,and the sepiolite lager is thick and shallow.The mineral composition of the deposit is rather simple.In chemical composition,it is rich in magnesium and calcium and low in silicon.The ore was tested to be easily and economically dressed,and with a high recovery and low cost,indicating a good prospect for exploitation.