第二个滥木厂式铊矿床何在?——杨家湾铊矿点的发现及其找矿远景初析

WHERE IS THE SECOND THALLIUM ORE DEPOSIT OF LANMUCHANG TYPE?——THE DISCOVERY OF YANGJIAWAN THALLIUM PROSPECT AND ITS PROSPECTING POTENTIALITY

杨家湾原为一汞矿点，在前人工作基础上通过对杨家湾北东向含矿断裂带中部在夜郎组第一段（Ｔｌｙ１）和第二段（Ｔｌｙ２）中系统进行地球化学剖面取样，分析结果表明，仅１件样品Ｔ１含量低于１００×１０－６（ＹＪ１５ＴＩ含量为５６×１０－６）外，其余１４件（ＹＪ１～ＹＪ１４）Ｔｌ含量均大于１００×１０－６，变化于３８６～９６０×１０－６之间，平均为６５３×１０－６（０．０６５３％），达到铊矿石工业品位要求，与滥木厂铊（汞）矿床对比，在赋矿地层、控矿构造、围岩蚀变和矿化特征等方面均极相似，成矿条件有利，找矿远景良好，如进一步工作，有可能找到第二个滥木厂式铊矿床。

Yangjiawan was a mercury prospect before,located to the southwest of Lanmuchang Thallium ore deposit in Xingren,Guizhou.Based on the ore bearing strata(upper Permian Longtan Changxing formation to lower Triassic Yelang formation),the structural ore-control(northeast field and faults),alternation(pyritization and kalinisation)and mineralization characteristics etc.of Yangjiawan thallium prospect being similar to Lanmuchang thallium ore deposit and the analysis results of oreforming element(Tl,Au,Hg,As,Sb)of samples in the real geochemistry section,the authors proved that the content of thallium conformed to industrial index(the average value of 14 samples is 635 × 10 -6 ranging from 386 to 960 × 10 -6 ).The authors decide that the prospecting potentiality is very favourable,especially in the deep of Yangjiawan thallium prospect.If the investigation and study of this prospect Continued,probably it will become the second thallium ore deposit of Lanmuchang type.