南京栖霞山铅锌银多金属矿床成矿流体中的分子化石

MOLECULAR FOSSILS FROM THE FLUID OF Pb Zn Ag POLYMETALLIC DEPOSIT AT QIXIASHAN, NANJING

热液型金属矿床中生物成矿作用研究的关健在于检测成矿流体中的有机质，尤其是其中的分子化石（生物标志化合物）。以南京栖霞山多金属矿床为例，重点研究了成矿流体遗留下来的最直接的样品———有机包裹体中的分子化石。利用非打开性的显微傅利叶变换红外光谱仪和紫外荧光分光光度计研究了有机包裹体的光谱学特征。利用打开性的色谱质谱计算机联用仪（ＧＣＭＳ）检测了成矿流体中的系列生物标志化合物，证实成矿流体中的有机质源自菌藻生物，与矿区发现的矿化生物一致，为生物成矿作用提供直接的证据。

Identification of organic matter in ore forming fluid is the keypoint in the studdying of biometallogenesis on hydrothermal ore deposits. This paper focuses on the molecular fossils in hydrocarbon inclusions from the Qixiashan polymetallic deposit in Nanjing. The optical and spectral characteristics of the individual hydrocarbon inclusions are systematically examined through such non destructive methods as Fourier transform infrared micro spectroscopy and ultra violet fluorescent microscope photometer. Series of biomarkers in metallogenic fluid are identified through gas chromatography mass spectrometry(GC MS). These biomarkers indicate that organic matter in ore froming fluid is derived from algae and bacteria. The investigation on the molecular fossils from fluid further strengthens biometallogenesis in the deposit which is previously discussed according to the mineralized organisms.