RELATIONSHIP BETWEEN THE FINENESS OF CRYSTALLIZING GOLD AND THE PROPORTION OF ALKALI METALS IN FLUIDS DURING THEIR INTERACTION WITH WALL ROCKS: EVIDENCE FROM DEPOSITS OF THE AMUR REGION

Abstract

The fineness of gold from endogenic gold deposits varies from 500 to 999. The causes of this wide variation have been discussed by many researchers and were comprehensively considered by Petrovskaya. Differences in depth and temperature regime of deposit formation, composition of gold-bearing mineral assemblages, age of mineralization, and other factors were regarded as crucial in this respect. However, the fineness of gold from hypabyssal and abyssal deposits is rather similar, although the statistical peaks of their frequency of occurrence are significantly different.