Pb-zn Deposit Of Yunnan Golden Dome Biomarkers Characteristics And Metallogenic Significance

Biomineralization is one of the most important and hot topic in the forefront area of mineral deposits. The paper studies the organic matter, rocks and ores of Jinding lead zinc deposit, which is based on the theories such as geochemistry and organic geochemistry. The main conclusions are as following:(1) Based on the characristics of the ore lead isotope composition, and the inert gas isotopic composition of inclusions and the REE characteristics of ores, organic matter and Triassic carbonate rocks, we can draw the conclusions that the ore-forming elements such as lead and zinc were derived from upper mantle, and the organic matter with ore derived from carbonate rocks in Triassic Sanhedong Formation. The Ce_anom showes Triassic carbonate deposited in a weak oxidation environment.(2) Analyzing on the extracted soluble organic and biomarkers of rocks and ores 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. The maturity of absorbed organic matter of sandstone type ore is slightly higher than the breccia type ores.(3) Contrasting the nine parameters of biomarkers, the organic matters of ore, Yunlong Formation and Huakaizuo Formation are closed to the one of Sanhedong Formation, which indicates that they have close relationship and reveals that the organic matter in deposit came from Triassic carbonate rocks.(4) Organic matter possibly played a role among the forming process of Jinding lead zinc deposit. The organism and organic matter preconcentrated metal in sedimentary stage. The organism reduces sulphate to offer the sulphur sources for mineralizeation. Ore -forming metals were transferred in the form of organic -metal complex during fluid transportation. Organic matter changed the physical-chemical environment to deposit ore mineral.