众所周知,金剛石產於金伯利巖和鉀鎂煌斑巖及其有關的砂礦中,近年來也曾在超基性巖體和苦橄巖中有所發現。1990年蘇聯學者在蘇聯的北哈薩克斯坦地殼巖石中,首先發現了原地產出的細粒金剛石,此種巖石均經受過高級變質作用。今年四月安徽省地質科學研究所大別山專題組的同志們,在徐樹桐高级工 It is well known that diamonds are found in kimberlite and potasparite and their associated plagioclase and have also been found in ultrabasic rocks and picrites in recent years. In 1990, Soviet scholars first discovered the locally produced fine-grained diamonds in the northern Kazakhstan crustal rocks of the Soviet Union, all of which have undergone advanced metamorphism. April this year, Anhui Institute of Geological Sciences Dabie Mountains special group of comrades, Xu Shudong senior workers