Organuic geochemistry of lead-zinc polymetallic deposits, northern guangdong

摘要

The characters of organic matter in rocks and ores in the Fankou and Dabaoshan de- posits are systematically studied with regard to their implications for mineralization. The results show that kerogens in this area fall mainly into the plutonism field in Van Krevelen's diagram. Reflectivity of the organic substance was measured to be 3.0.6/100 (Fankou) and 1.67/100 (Dabaoshan), corresponding to the paleo-geotemperatures of 232 deg.C and 184 deg.C respectively. The same types of porphyrins and hydrocarbons were recognized in the rocks and ores and hy- Drocarbon-bearing inclusions are widespread in quartz and calcite, particularly in Dabaoshan.