摘要
对江西赣县洋西坑钼矿床区域地质、矿床地质、矿体特征等进行了研究,并采集石英脉中的辉钼矿进行了单矿物Re-Os同位素测年。结果表明:矿区无地层出露,主要岩性为细粒黑云母花岗岩(3bγ2-25),其外围为中粗粒似斑状黑云母花岗岩(1-2ρbγ2-15),两者呈侵入接触关系;矿床矿化类型为内带石英脉型;矿区内3条矿化带受近南北向构造控制,平行成组出现,南北向构造为矿体提供了赋存空间。通过对洋西坑钼矿8个辉钼矿样品的Re-Os同位素分析测试,获得等时线年龄和模式年龄加权平均值分别为(156.09±0.77)Ma和(155.78±0.81)Ma,该高精度年龄代表该钼矿床的成矿年龄,并与南岭钨锡成矿年龄一致。
Yangxikeng molybdenum deposit is located in the central south of Yushan polymetallic metall-ogenic belt. The regional geology, deposit geology and orebody characteristics of Yangxikeng molybdenum deposit in Ganxian of Jiangxi were studied, and molybdenite collected from quartz vein was measured by monomineral Re-Os isotopic dating. The results show that there is no stratum outcrop but only fine grained biotite granite （3bγ5^2-2） in the mining area, and the periphery is middle coarse grained porphyraceous biotite granite （1-2ρbγ5^2-1）, and the contact relationship of them is intrusive; mineralization type of orebody is endomorphie zone quartz veinl three mineralization belts in the mining area, which is controlled by near NS-trending tectonic, appear parallelly in group, and NS-trending tectonic provides occurrence space for orebody. Re-Os isotopic dating results of 8 molybdenite samples from Yangxikeng molybdenum deposit indicate that the isochron age and weighted average model age are （156.09±0.77） Ma and （155.78 ± 0. 81）Ma, and the high precious age is the mineralization age of molybdenum deposit and matches the mineralization age of Wu-Sn deposit in Nanling area.
出处
《地球科学与环境学报》
CAS
2013年第4期77-82,共6页
Journal of Earth Sciences and Environment
基金
中国地质调查局资源潜力评价类项目(1212010881614)
关键词
钼矿床
Re—Os同位素
辉钼矿
地质特征
石英脉
花岗岩
南岭地区
江西
molybdenum deposit
Re-Os isotope
molybdenite
geological characteristic
quartz vein
granite
Nanling area
Jiangxi
