安徽省宿州栏杆地区震旦系金山寨组底砾岩与辉绿岩中金刚石对比
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摘要
安徽省宿州栏杆地区金刚石勘查历时近40多年,安徽省地勘局第二水文工程地质勘查院于1982年12月在震旦系金山寨组底砾岩中发现次生金刚石,2017年9月在栏杆地区辉绿岩中发现原生金刚石矿体,提交工业级资源储量约25万克拉。本文对震旦系金山寨组底砾岩中次金刚石和辉绿岩中原生金刚石,从金刚石晶体形貌特征、晶面蚀象、拉曼光谱和红外光谱等方面进行对比,确定金刚石的品级(Ιb或Ιa型),进而判别其来源深度的不同,为宿州栏杆地区金刚石找矿方向提供依据。
Diamond exploration lasted almost 40 years in the Lan'gan area, Suzhou, Anhui Province. Secondary diamond was firstly found in the basal conglomerate of the Jinshanzhai Formation of the Sinian in December of1982 and primary diamond deposit discovered in the diabase in the Lan'gan area in September of 2017, both by No.2 Institute of Hydrogeology and Engineering Geology, Bureau of Geology and Mineral Exploration of Anhui Province, which has submitted a report of industrial-grade reserve of about 250000 carats. This paper makes a comparison of the two sources of diamonds in terms of morphological characteristics, etched figure of crystal face, Raman spectrum and infrared spectrum to rate the diamonds(Ib or Ia type), identify the source depth, and provide basis for diamond prospecting in the Lan'gan area, Suzhou.
Diamond exploration lasted almost 40 years in the Lan'gan area, Suzhou, Anhui Province. Secondary diamond was firstly found in the basal conglomerate of the Jinshanzhai Formation of the Sinian in December of1982 and primary diamond deposit discovered in the diabase in the Lan'gan area in September of 2017, both by No.2 Institute of Hydrogeology and Engineering Geology, Bureau of Geology and Mineral Exploration of Anhui Province, which has submitted a report of industrial-grade reserve of about 250000 carats. This paper makes a comparison of the two sources of diamonds in terms of morphological characteristics, etched figure of crystal face, Raman spectrum and infrared spectrum to rate the diamonds(Ib or Ia type), identify the source depth, and provide basis for diamond prospecting in the Lan'gan area, Suzhou.
引文
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[2]路凤香,郑建国,陈华美.有关金刚石形成条件的讨论[J].地质前缘,1998(3):125~132.
[3]倪培,马玉广,朱仁智,居易.皖东北地区金刚石成矿质背景研究[R].安徽省地勘局第二水文工程地质勘查院,2015.
[4]马玉广,周世文,万才宇,等.安徽省宿州市栏杆—褚栏地区金刚石普查报告[R].安徽省地勘局第二水文工程地质勘查院,2017.
[5]Wilson,L.,Head,J.W.An integrated model of kimberlite ascent and eruption[J].Nature,2007,447(7140):53~57.