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安徽首次发现金刚石矿资源

2017-08-20 13:41:18   央广网

央广网宿州8月20日消息(记者刘军)据中国之声《央广新闻》报道,《安徽省宿州市栏杆~褚栏地区金刚石普查报告》日前获得安徽省国土资源厅组织的专家评审会通过,标志着在安徽范围内首次发现了金刚石矿资源,我国现存被发现的金刚石矿资源存量有了相应的增加。

安徽省自上世纪七十年代开展金刚石找矿工作,原安徽664地质队于1982年就曾在宿州市栏杆地区震旦系古底砾岩中找到次生金刚石。“十二五”期间,安徽省又启动了宿州市栏杆地区金刚石普查项目,由安徽省地勘局第二水文工程地勘院勘查实测。自2014年7月始,宿州市栏杆地区陆续发现原生金刚石,部分钻孔发现数粒、数十粒到数百粒原生金刚石,少数钻孔金刚石含量已达到工业品位。

通过进一步开展物化探、钻探、竖井、浅井、取样测试和选矿等方法,初步发现和圈定了辉绿岩强风化残积型金刚石砂矿体2个,大致查明了该区含原生金刚石的载体岩石主要有辉绿岩、橄榄玄武岩、玄武质角砾熔岩和火山角砾岩。此次在安徽宿州发现金刚石矿,填补了安徽金刚石矿产资源取量表的空白,我国现存被发现的金刚石矿资源存量有了相应的增加。

宿州市栏杆~褚栏地区金刚石呈浅黄绿色,粒径0.2-0.6mm,呈自形立方体与曲面菱形十二面体或立方体与八面体之聚型组成,晶体透明、洁净,金刚光泽。矿石工业类型为研磨与切割用金刚石,品级属细粒Ⅰb型金刚石。另外,这一次的普查也在金刚石矿的找矿理论上实现了较大突破,由之前的超基性岩到此次的基性岩。

据专家介绍,在国内外金刚石找矿勘查历程中,传统的原生金刚石矿成矿类型主要为金伯利岩型和钾镁煌斑岩型二大类,如国内山东蒙阴和辽宁瓦房店金伯利岩型金刚石矿床,国外澳大利亚的阿盖尔钾镁煌斑岩型金刚石矿床。而此次宿州市栏杆~褚栏地区金刚石普查,是首次在辉绿岩基岩及强风化带中发现了金刚石矿物。

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