论文部分内容阅读
报道了季德屯、石马洞大型钼矿床地质特征,并对季德屯及石马洞钼矿辉钼矿样品分别进行了Re--Os同位素分析。所获季德屯大型钼矿床辉钼矿的模式年龄值为(168.79±0.42~169.91±0.47)Ma,加权平均年龄为169.31 Ma,等时线年龄为(169.1±1.8)Ma(MSWD=7);石马洞大型钼矿床辉钼矿的模式年龄值为(164.85±1.46~166.21±0.90)Ma,加权平均年龄为165.66 Ma,等时线年龄为(169.3±1.9)Ma(MSWD=1.3)。这些年龄说明两个矿床成矿年龄均为中侏罗世,与大黑山等钼矿成矿年龄基本一致。结合区域上已有的研究成果,认为吉林省中东部钼矿成岩成矿作用主要集中在早—中侏罗世。通过区域构造演化和区域钼矿矿床特征及成岩成矿年龄的分析,认为吉林省中东部大规模钼矿的成矿与太平洋板块的俯冲作用的联系更为密切。
The geological characteristics of the large molybdenum deposit in Jiadutun and Shimandong were reported. Re - Os isotope analysis of molybdenite samples in Jiadutun and Shimandongdong molybdenum were carried out respectively. The model age values of the molybdenite from the Jiadutun large molybdenum deposit are (168.79 ± 0.42 ~ 169.91 ± 0.47) Ma, the weighted average age is 169.31 Ma, and the isochron age is (169.1 ± 1.8) Ma (MSWD = 7) (164.85 ± 1.46-166.21 ± 0.90) Ma, the weighted mean age was 165.66 Ma, and the isochron age was (169.3 ± 1.9) Ma (MSWD = 1.3). These ages indicate that the mineralization ages of the two deposits are both Middle Jurassic and are basically the same as the mineralization age of molybdenite such as Daheishan. Based on the existing research results in the region, it is concluded that the mineralization of molybdenum in the central and eastern Jilin Province mainly concentrates in the Early-Middle Jurassic. Through the analysis of regional tectonic evolution and regional molybdenum deposit characteristics and diagenetic metallogenic age, it is concluded that the mineralization of large-scale molybdenum deposits in the central and eastern part of Jilin Province is more closely related to the subduction of the Pacific plate.