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江西省上饶县金竹坪钼多金属矿区位于北武夷梨子坑(铜钹山)火山岩盆地,该火山岩盆地是北武夷地区火山岩分布区,本区新发现了较大规模的钼多金属矿化。金竹坪矿区位于该火山岩盆地的近中心位置,钼(钨)多金属矿体又主要赋存于隐伏(半隐伏)花岗岩与其上覆火山岩的接触带,矿化与接触带产状一致。文章通过在该接触带的蚀变花岗岩型矿体中采集的5件辉钼矿样品进行铼-锇同位素定年测试,获得了辉钼矿等时线年龄为(135.5±5.7)Ma,其加权平均方差(MSWD)为16,表明成矿作用发生在中生代白垩纪。由于矿体赋存于岩体顶突部位的蚀变花岗岩中,预示成矿为花岗岩侵入的同期或稍后,即钼钨铅锌银成矿与燕山期花岗岩侵入活动密切相关,这对于火山岩内寻找与侵入岩有关的矿产提供了新的思路。
The Jinzhuping molybdenum polymetallic deposit in Shangrao County, Jiangxi Province is located in the Peizikeng (Tongbai Mountain) volcanic basin in the north Wuyi. The volcanic basin is the volcanic rock distribution area in the northern Wuyi area. A large-scale molybdenum polymetallic mineralization has been newly discovered in this area. The Jinzhuping area is near the center of this volcanic basin. The molybdenum (tungsten) polymetallic ore body mainly occurs in the contact zone between the buried (semi-buried) granite and the overlying volcanic rocks. The mineralization is consistent with the occurrence of the contact zone. In this paper, five molybdenite samples collected from the altered granite-type ore bodies in the contact zone were used for rhenium-osmium isotope dating. The isochron age of molybdenite was (135.5 ± 5.7) Ma, and its weighted average The variance (MSWD) is 16, indicating that the mineralization occurred during the Mesozoic Cretaceous. Because the ore body is in the altered granite at the top of the rock mass, it indicates that the mineralization was in the same period of granite intrusive or later, that is, the molybdenite, lead, zinc and silver mineralization are closely related to the intrusive activity of Yanshanian granite, Finding minerals associated with intrusive rocks offers new insights.