康滇地轴北段层控铅锌矿沉积地球化学场剖析

A GEOCHEMISTRY FIELD ANALYSIS OF STRATABOUND LEAD-ZINC ORES IN THE NORTHERN PART OF THE KANGDIAN GEOAXIS

用区域化探方法(水系沉积物)对康滇地轴北段4000km^2范围内的铅锌矿作了预测和远景评价。铅锌和微量元素的区域地球化学资料显示,在宁会地区Pb、Ag、Ba从南到北增加,Zn、Cd、Hg、As从北到南增加,而甘洛地区相反。铅辞和微量元素的分布能作为铅矿或锌矿产出环境的显示。甘洛北部和宁会南部是二个最有利找锌矿的远景区。马拉哈和银厂沟断裂带是最有利找铅矿的远景区。这无疑对找矿有一定的指导意义。

Regional geochemical exploration (stream sediment survey) has been made in an area of 4000 km^2 in the north part of the Kangdian Geoaxis with the purpose of Pb-Zn prospectiveness assessment. In Ninghui district Pb, Ag, Ba are increasing form south to north, Zn,Cd, Hg, As are increasing from north to south.In Ganluo area these trends are proved to be contrary.The distribution pattern of Pb, Zn and trace elements can be used as indicator showing the ore-forming environment of Pb and/or Zn. North part of Ganluo and south aprt of Ninghui are the two most favourable areas for Zn.Malaha and Yinchanggou (Silver Valley) fracture zones are the two most prospective areas for Pb exploration.