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云南兰坪金顶矿床是世界上形成时代最新且唯一陆相沉积岩容矿的超大型铅锌矿床,也是中国目前最大的铅锌矿床,有机物质在金属成矿中可能发挥重要作用,受人关注。矿石及矿化岩石中产有包括干酪根、轻油、烃类气、重油、沥青及方解石中石油、甲烷包裹体等多种形式、产状和成熟度的有机物质,油气显示突出,古油气藏遗迹明显,是金顶古油气藏在铅锌成矿过程中热成熟、裂解和被改造、破坏不同阶段的产物。有机物质的氯仿沥青“A”变化大(72×10~(-6)～395415.42×10~(-6))。“A”的族组分中,总烃(58.47%)大于“非烃+沥青烯”(41.53%),饱和烃/芳香烃比值大于1,具Ⅰ型有机母质特征。有机转化率(A/C=0.5%～7.2%)较矿床外围岩石低,有机热成熟度高。矿石及矿化岩石中有机质的饱和烃包括正构烷烃、Pr、Ph和iC_(18)等化合物,碳数分布介于C_(10)～C_(34)之间,C_(21+22)/C_(28+29)=0.78～3.582,Pr/C_(17)=0.25～0.646,Ph/C_(18)=0.39～1.57,有机母质为海相菌藻类。有机质中检测出萘、菲、三芳甾烷、联苯、荧蒽等芳香烃类化合物,菲系列化合物最为明显,MPI_1 =0.215～0.434,MPI_2=0.252～0.588,菌藻等有机母质发育在高盐度还原沉积环境,烃源岩主要是三叠系残留海相碳质泥岩和泥灰岩。伴随金顶局部穹隆过程,很可能在金顶穹隆中形成油气藏,它是矿区铅锌快速大规模集中成矿的重要还原剂之一。
The Lanping Jinding deposit in Yunnan is the largest ultra-large lead-zinc deposit in the world with the latest generation and continental facies sedimentation. It is also the largest lead-zinc deposit in China. Organic matter may play an important role in metallogenesis, . Ore and mineralized rocks include organic matter in kerogen, light oil, hydrocarbon gas, heavy oil, bitumen and calcite in petroleum, methane inclusions and other forms, occurrences and maturities, oil and gas shows prominent, paleo-oil reservoir remains Obviously, it is the product of the Jinding oil and gas reservoirs that are matured, cracked and transformed during the lead-zinc mineralization process and destroyed the different stages. The organic material of the chloroform asphalt “A” changes (72 × 10 -6 ~ 395415.42 × 10 -6)). The total hydrocarbon (58.47%) is larger than “non-hydrocarbon + asphaltene” (41.53%) and the ratio of saturated hydrocarbon / aromatic hydrocarbon is greater than 1, which is characterized by the type I organic parent material. The organic conversion rate (A / C = 0.5% -7.2%) is lower than that of the peripheral rocks and the organic thermal maturity is high. Saturated hydrocarbons of organic matter in ores and mineralized rocks include n-alkanes, Pr, Ph and iC_ (18) and other compounds with a C number distribution of C_ (10) ~ C_ (34) C 28 + 29 = 0.78 ~ 3.582, Pr / C 17 = 0.25 ~ 0.646, Ph / C 18 = 0.39 ~ 1.57. Phenanthrene compounds such as naphthalene, phenanthrene, triarylstannane, biphenyl and fluoranthene were detected in organic matter. The compounds of phenanthrene series were the most obvious, with MPI_1 = 0.215-0.434 and MPI_2 = 0.252-0.588. The degree of sedimentary environment restoration, source rocks are mainly Triassic marine mudstone and marl mudstone. With the dome-top dome process, it is likely to form reservoirs in the Jinding dome. It is one of the important reductants for rapid and large-scale concentrated mineralization of lead and zinc in the mining area.