AGATE-LIKE STRUCTURE AND HETEROGENEITIES OF NITROGEN AND HYDROGEN IMPURITIES OF DIAMOND IN MENGYIN, CHINA

Abstract

The growth structure, period and process of diamond can be revealed by the cathodluminescence (CL) technique. The rare agate-like structure of diamond is first discovered in Mengyin area, Shandong Province, China and its characteristics and genetic mechanism are discussed. The FTIR in-situ analysis of the oriented plate of the diamond shows that there exist heterogeneities of N and H impurities. The total contents of N and percentage of B defects decrease gradually, and the H contents fluctuate irregularly from central to periphery of the diamond. The growth structure and heterogeneities of the impurities indicate participation of melts/fluids and the complexities in growth processes and environments in upper mantle.