应慎对黎平敖市地区金刚石砂矿异常

Diamond Placer Anomaly in Aoshi Area of Liping Should be Considered Carefully

贵州黎平敖市地区累计报道了100多粒金刚石的出土信息[1-7],除亮江干流中黄、亮司和大同段的8粒金刚石为专业地勘队伍找矿选获(任怀翔,1994)[1]外,其余均来自当地金农报矿。而且通过多次的重砂测量、地质调查以及地球物理地球化学勘探等工作,一直未取得金刚石找矿(岩体)勘查任何实质意义的进展,为了加强金刚石晶形和晶貌及其可能来源的分析研究,曾向当地金农金购买少量金刚石,针对金农表示"要多少有多少"的言语信息等,本文认为应质疑敖市地区出土金刚石砂矿的事实,谨慎对其金刚石找矿问题,建议以基岩地层地球化学为背景,以Cr、Co、Ni、Ti等幔源特征元素为分析目标,采用水系沉积物地球化学测量方法查证区内金刚石砂矿异常的真实性,以避免多次重复工作及盲目投入高成本地球物理探测等,或者可以快速圈定找矿(岩体)靶区,结合其它方法加快金刚石的找矿勘查。

The news ＇ more than 100 diamond were found in Aoshi area of Liping＇ is reported, only 8 dia- mond in Huangsi, Liangsi and Datong of Liangjiang are found by professional geological team, the others are found by the local farmers. There is no any improvement for diamond prospection by times＇ heavy - mineral measurement, geological investment and geochemical prospection, in order to strengthen the study of crystal shape, morphology of diamond and its possible origin, few diamond were bought from the local farmers. According to the information of ＇ no limitation＇ from the local farmers, it＇ s thought the news of diamond are found in Aoshi should be doubted. It＇ s suggested to testify the factuality of diamond placer anomaly by stream sediment geochemical method with the studying targets geochemistry, so muti- times work and high expense of Cr, Co, Ni and Ti under the background of bed rock geophysical investment can be avoided. It also can determine the target area quickly, speed up the diamond prospection by other ways.