Organic mineralization in Jinding lead-zinc deposit, Yunnan, China: the evidence from biomarker of organic matter of wall rock and ores

The Jinding ore deposit is the youngest and the only giant deposit hosted in continental sedimentary rocks in the world. There are two type of organic matters: primary and migratory ones. Analyzing on the extracted soluble organic ,biomarkers of rocks and ores of jinding lead-zinc deposit shows that n-alkanes with a relatively wide range contain two highest peak. According to the relatively abundance, pentacyclic triterpane >tricyclic terpane >quartcyclic terpane. The carbon number distribution of the steranes show a slight predominance of C28. Indicates that the organic matter of ore is origin in marine alga, and there are a certain amount of plants at the same time. The organic matter was deposited in a weak oxidation-weak reduction environment, and it approaches mature stage. Some of organic matter underwent biodegradation, and all organic samples underwent a certain degree’s thermal decomposition because of the hydrothermal alteration. Contrasting the parameters of biomarkers, which indicates that they have close relationship and reveals that the organic matter in deposit came from Triassic carbonate rocks. Primary organic matters fore-enriches ore-forming elements and migratory ones can dissolve and move ore-forming elements.