摘要
运用野外地质调查与地球化学分析相结合的方法，对陕南汉中马元地区震旦系灯影组碳沥青矿的成矿条件、有机质与地球化学特征进行了研究。结果表明，碳沥青矿主要产于灯影组角砾白云岩中，受地层与构造的控制，与上覆郭家坝组碳质板岩具有同源性；碳沥青有机碳含量（TOC）为2．85％，氯仿沥青“A”为0．011％，生烃潜量为0．24μg／g：镜质组反射率为3．76％和3．81％；成矿温度变化在176．6-240．6℃之间，认为碳沥青经历了高成熟-过高成熟的演化阶段。
Mineralization conditions, organic matter and geochemical characteristics of the Sinian Dengying Formation anthraxolite ore in Mayuan area of Hanzhong, Southern Shaanxi, are studied by using a combination method of field geological surveys and geochemical analysis. The results show that anthraxolite ore is mainly occurred in the brecciated dolomite of Dengying Formation, controlled by the stratigraphy and structures, from the same source with the overlying Guojiaba Formation carbonaceous slate. The organic carbon content in the anthraxolites （TOC） is 2.85%. The chloroform bitumen ＂A＂ is 0.011%. Hydrocarbon-producing potential is 0.24 μ g/g. The vitrinite reflectance rates are 3.76% and 3.81%. Mineralization temperature changes between 176.6- 240.6 ℃. It is thought that the anthraxolite has experienced high mature-over high mature stages of evolution.
关键词
马元地区
碳沥青
有机质
地球化学
Mayuan area
Anthraxolite
Organic matter
Geochemistry
