湖南七里坪－半边街镁质矽卡岩硼矿床微量元素地球化学

湖南七里坪－半边街接触交代型硼矿，矿体产于中石炭统壶天群白云岩与燕山期花岗岩接触带的矽卡岩中，产状受岩体顶板形态的控制，多为似层状、透镜状、囊状等。一般离岩体较远的部位硼矿石的品位较富，但靠近岩体的部位矿体较厚大。据微量元素相关系数聚类谱系图分析，Ｂ元素在岩体中呈分散状态，在高温热液中易于聚集，在矽卡岩中富集成矿，在蚀变的白云岩中有轻微的富集。

A BORATE DEPOSIT ASSOCIATED WITH MAGNESIAN SKARN IN QILIPING BANBIANJIE REGION:GEOCHEMISTRY OF TRACE ELEMENTS

Qiliping Banbianjie borate deposit in Hunan of a contact metasomatic type occurs in the contact, nemely skarn zone, of the Hutian dolomite of the Middle Carboniferous series with the Yanshan granite, controlled by the layout of the granitic roof and foot walls as stratoid,lenticular, chambered, and the like. The ore bodies as usual maitain high graded close to the granite and great thickened far away from it. Studies of correlationships between trace elements indicate that dispersed boron was easy to concentrate in high temperture solutions, enrich into ores in the skarn zone and slightly increase in grade in the altered dolomite.