南京大学学报(自然科学版) ›› 2018, Vol. 54 ›› Issue (2): 278.
朱仁智1,倪 培1*,马玉广2,盛中烈3,丁俊英1,王国光1,管申进4
Zhu Renzhi1,Ni Pei1*,Ma Yuguang2,Sheng Zhonglie3,Ding Junying1,Wang Guoguang1,Guan Shenjin4
摘要: 安徽栏杆地区位于华北克拉通东部陆块东南缘,该区新元古代地层中发育含原生金刚石的辉绿岩. 不同于山东蒙阴和辽宁瓦房店金刚石容矿岩石为金伯利岩,栏杆地区金刚石容矿岩石为基性岩,这在我国尚属首例. 对栏杆地区金刚石展开了形态学、拉曼光谱和红外光谱的研究,并对金刚石容矿岩石进行了岩相学和年代学研究. 结果表明栏杆地区金刚石呈黄绿色-黄褐色,透明,金刚石光泽,高硬度,晶形良好,为八面体和菱形十二面体,粒径0.1~0.5 mm,集中在0.2~0.35 mm,在1332 cm-1出现典型金刚石拉曼谱峰. 金刚石红外光谱中出现1130 cm-1谱峰,未出现1282 cm-1和1175 cm-1谱峰,为Ib型金刚石. 岩相学结果表明金刚石容矿岩石为辉绿岩. 斜锆石SIMS Pb-Pb定年结果表明辉绿岩形成年龄为912~914 Ma,代表了区域上一期新元古代基性岩浆作用事件,该期事件形成了栏杆地区原生金刚石. 栏杆地区橄榄玄武岩和玄武质角砾熔岩中捕获了含金刚石的辉绿岩角砾,导致岩石中含有极少量的金刚石.
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