江西梅树坪钨钼矿床地质、成岩成矿时代与找矿方向

发布时间：2018-01-27 01:26

本文关键词： 南岭地区石英脉型钨钼矿燕山期锆石U-Pb定年辉钼矿Re-Os定年　出处：《地学前缘》2017年05期 　论文类型：期刊论文

【摘要】：梅树坪钨钼矿床位于南岭成矿带崇余犹矿集区内,矿体发育于九龙脑岩体南缘接触带,构造上受北北东向断裂控制,矿化类型主要为石英脉型钨钼矿化,并发现了细粒花岗岩中浸染状白钨矿化,与成矿有关的岩浆岩以中粗粒斑状黑云母花岗岩为主。本文在矿床地质工作基础上,利用LA-ICP-MS锆石U-Pb法获得中粗粒斑状黑云母花岗岩的年龄为(157.2±1.70)Ma;并利用辉钼矿Re-Os同位素测年,获得黑钨矿化石英脉中的辉钼矿的年龄为(156.2±0.93)Ma。研究表明梅树坪花岗质岩浆活动与成矿作用基本同时,均为燕山晚期,成矿紧随岩浆就位发生。结合前人的研究成果,梅树坪钨钼矿与华南地区钨多金属大规模成矿作用时间150~160 Ma一致。梅树坪钨矿与西华山钨矿等具有相同的成矿时代、成矿背景和相似的成矿条件,预测矿区隐伏岩体南延之内接触带和震旦系变质砂岩外接触带具有很好的找矿潜力。
[Abstract]:Meishuping tungsten and molybdenum deposit is located in the Chongyu ore concentration area of the Nanling metallogenic belt. The orebody is developed in the contact zone of the southern margin of the Jiulongnao rock body. The structure is controlled by the NNE fault, and the mineralization type is mainly quartz vein type tungsten and molybdenum mineralization. The disseminated scheelite mineralization in fine-grained granites is found and the magmatic rocks related to mineralization are mainly medium-coarse porphyry biotite granite. This paper is based on the geological work of the deposit. The age of medium coarse porphyritic biotite granite obtained by LA-ICP-MS zircon U-Pb method is 157.2 卤1.70 Ma. And the Re-Os isotopic dating of molybdenum is used. The age of molybdenum in the quartz vein of wolframite fossil is 156.2 卤0.93Ma.The study shows that the magmatic activity and mineralization of Meishuping granitic magmatism are basically at the same time, both of them are late Yanshanian. Mineralization follows the occurrence of magma in situ. Combined with previous research results. Meishuping tungsten-molybdenum deposit is the same as the large-scale tungsten polymetallic mineralization time of 150 ~ 160Ma in South China. Meishuping tungsten deposit has the same metallogenic age as Xihuashan tungsten deposit. The metallogenic setting and similar metallogenic conditions indicate that the contact zone within the southern extension of the concealed rock mass and the external contact zone of the Sinian metamorphic sandstone have good prospecting potential.
【作者单位】：中国地质大学(北京)地球科学与资源学院;中国地质科学院矿产资源研究所;江西省地质矿产勘查开发局赣南地质调查大队;江西崇义县梅树坪钨业;国家地质实验测试中心;
【基金】：国土资源部公益性行业科研专项(201411050) 国家重点研发计划课题(2016YFC0600208) 国家自然科学基金项目(41372092)
【分类号】：P618.6
【正文快照】： 3.江西省地质矿产勘查开发局赣南地质调查大队,江西赣州3410004.江西崇义县梅树坪钨业,江西赣州3410005.国家地质实验测试中心,北京100037WANG Haoyang1,2,ZHAO Zheng2,*,CHEN Wei 3,ZHOU Hui 4,CHEN Zhengyu2,HOU Kejun2,LI Chao31.School of Earth Sciences and Resources,C

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