Organic petrography and geochemistry of the giant Jinding deposit,Lanping basin,northwestern Yunnan,China.

摘要: The Jinding giant ore deposit,Lanping,Yunnan,is the youngest and only continental sediment-hosted super-large Zn-Pb deposit in world,and also largest China followed with interests.Various kinds of organic matte, such as kerogen,light oil,hydrocarbon gases,heavy oil,bitumen different occurrences maturation,and oil-and methane-inclusions calcites,and their petrography have been revealed this paper.The showing oil-gas old oil-pool traces are evident district.The matter may be every stage's products heat-maturation,splitting disruption pool play an important role on mineralization.The chloroform bitumen"A"in is variation(72×10~(-6)～395415.42×10~(-6)).The total hydrocarbon(58.47%)is more than"non-hydrocarbon+asphaltic olefin"(41.53%),the ratio saturated-/aromatic-hydrocarbon over 1,and primary I-type.The transformation ratio(A/C =0.5%～7.2%)is rock's field,and had maturated,The saturated hydrocarbon ores ore-beating rocks include normal paraffin hydrocarbon,Pr,Ph,iC_(18),and so on, carbon number C_(10)～C_(34),C_(21+22)/C_(28+29)=0.78～3.582,Pr/C_(17)=0.25～0.646,Ph/C_(18)=0.39～1.57,and primery marine algae.The aromatic naphalin,phenanthrene,triaromatic steroid, biphenyl fluoranthene,and phenanthrene compounds most evident,MPI_1=0.215～0.434,MPI_2=0.252～0.588. algae developed reduced environment high salinity,and source rock carbon-rich mudstone marl.A oil might form dome during doming one reduction large-scale metal mineralization.