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采用显微光度计测定黔北下寒武统牛蹄塘组黑色岩系固体沥青反射率平均为5.89%,按相关经验公式折算出来的镜质体反射率平均为4.123%,在迈维尔图解、Karwell图解、Hood图解上投点,结合干酪根和孢粉颜色指数法,推断黑色岩系的古地温为60～250℃。结合黄铁矿热电系数法和包裹体均一法测温值,认为黑色岩系属中、低温沉积成岩成矿作用,以低温沉积成岩成矿作用为主。“热”的来源为海底火山喷溢,含矿热卤水提供了丰富的有用元素。黑色岩系有机碳含量高,属好烃源岩,有机质成熟度高,热演化程度高,属过成熟。黑色岩系古地温的研究,对阐明黑色岩系的沉积、成岩和成矿条件具有重要意义。
The average reflectance of solid bitumen in the Niutizang Formation of the northern Cambrian Niutitang Formation in northern Guizhou Province was 5.89%. The average vitrinite reflectance calculated by the relevant empirical formula was 4.123% Karwell diagram, Hood plot point, combined with kerogen and sporopollen color index method, infer that the ancient black ground rock temperature is 60 ~ 250 ℃. Combining the pyroelectric coefficient method of pyrite and the uniform temperature method of inclusions, it is considered that the black rock belongs to the medium and low temperature sedimentary diagenesis and mineralization, which is dominated by low temperature sedimentary diagenesis and mineralization. The source of “hot” is the abundance of useful elements for submarine volcanic spills and ore-bearing hot brine. Black rock series organic carbon content is high, is a good source rock, organic matter of high maturity, high degree of thermal evolution, is a mature. The study of paleo-geothermal temperature in black rock series is of great significance to elucidate the sedimentary, diagenetic and metallogenic conditions of black rock series.