鲁苏皖一带基性—超基性岩中金刚石特征及其成因分析

Study on Characteristics and Origin of Diamond in Basic—Ultrabasic Rock in Shandong Jiangsu and Anhui Province

摘要:

鲁苏皖一带发现的呈串珠状含金刚石基性超基性岩体，其金刚石成因是否相同？该文通过对比分析基性岩中与典型金伯利岩中产出的金刚石在晶体形态、粒径、晶面蚀像、金刚石类型等差异性，金刚石含矿母岩对比研究，金刚石在容矿岩石中分布，分析总结鲁苏皖一带基性超基性岩中金刚石的成因。超基性金伯利岩中金刚石成因为地幔捕掳晶成因，基性岩中金刚石多为岩浆结晶成因。

Abstract:

Beadlike diamond-bearing basic—ultrabasic rock have been found in Shandong, Jiangsu and Anhui Province. Is the origin of diamond the same? The differences of diamond in crystalfiguration, particle diameter，crystal surface corrosion image and diamond type occurred in basic rock and typical kimberlite rocks have been compared and analyzed. Based on comparative study of diamond ore-bearing parent rocks and the distribution of diamond in host rocks, the genesis of diamond in basic—ultrabasic rocks in Shandong, Jiangsu and Anhui provinces have been analyzed and summarized. The diamond origin in ultrabasic kimberlites is mantle trapping crystallization, and diamond in basic rocks is mostly magmatic crystallization.