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引用本文:范飞鹏,肖凡,项红亮,陈世忠,李超,周延,陈凯,曹明轩. 闽中德化邱埕钼矿床辉钼矿Re-Os同位素定年及其对成矿时间的限定[J]. 中国地质, 2021, 48(6): 1838-1849.
FAN Feipeng,XIAO Fan,XIANG Hongliang,CHEN Shizhong,LI Chao,ZHOU Yan,CHEN Kai,CAO Mingxuan. Molybdenite Re-Os dating of the Qiucheng Mo deposit in Dehua of central Fujian Province and constraints on the mineralization time[J]. Geology in China, 2021, 48(6): 1838-1849(in Chinese with English abstract).
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闽中德化邱埕钼矿床辉钼矿Re-Os同位素定年及其对成矿时间的限定
范飞鹏1, 肖凡1, 项红亮2, 陈世忠1, 李超3, 周延1, 陈凯4, 曹明轩5
1.中国地质调查局南京地质调查中心, 江苏 南京 210016;2.福建省双旗山矿业有限责任公司, 福建 德化 362500;3.国家地质实验测试中心, 北京 100037;4.中国矿业大学资源与地球科学学院, 江苏 徐州 221000;5.中国地质科学院研究生院, 北京 100049
摘要:
福建德化邱埕钼矿床是德化-尤溪-永泰矿集区唯一一处规模较大的钼矿床。辉钼矿体分布在花岗斑岩外接触带,辉钼矿多沿中新元古代变质岩和晚侏罗世花岗岩裂隙分布,多呈浸染状、脉状和团块状。本次测得该矿床6件辉钼矿样品Re-Os模式年龄为150.1~152.8 Ma,187Re-187Os等时线年龄为(150.8±1.6)Ma,加权平均年龄为(151.8±0.9)Ma,表明成矿时代为晚侏罗世晚期,与该地区大规模的火山-侵入体活动相关;Re/Os比值远大于4,Re同位素含量14.31×10-6~45.8×10-6(最高达174.7×10-6),指示成矿物质主要来源于壳源,可能还有少量幔源物质的加入。邱埕钼矿床的形成可能为古太平洋板块朝东亚陆缘碰撞挤压作用结束向伸展作用转化过程的产物。
关键词:  Re-Os同位素年龄  辉钼矿  斑岩型钼矿  矿产勘查工程  邱埕  福建德化
DOI:10.12029/gc20210614
分类号:P578.2+92
基金项目:国家重点研发计划“武夷德化—尤溪—永泰矿集区三维综合探测与深部成矿预测”课题(2016YFC0600210)和中国地质调查局项目(DD20160037,DD20190153)联合资助。
Molybdenite Re-Os dating of the Qiucheng Mo deposit in Dehua of central Fujian Province and constraints on the mineralization time
FAN Feipeng1, XIAO Fan1, XIANG Hongliang2, CHEN Shizhong1, LI Chao3, ZHOU Yan1, CHEN Kai4, CAO Mingxuan5
1.Nanjing Center, China Geological Survey, Nanjing 210016, Jiangsu, China;2.Shuangqishan Mining Co., Ltd. of Fujian, Dehua 362500, Fujian, China;3.National Research Center for Geoanalysis, Beijing 100037, China;4.School of Resources and Earth Sciences, China University of Mining and Technology, Xuzhou 221000, Jiangsu, China;5.Graduate School of Chinese Academy of Geological Sciences, Beijing 100049, China
Abstract:
The Qiucheng Mo deposit is located in the Dehua-Yongxi-Yongtai ore-concentrated area of Fujian Province. It is the only one large-scale molybdenum deposit there. Ore bodies are mainly distributed in the outer contact of granite porphyry, fissure filling of the middle-late Proterozoic metamorphic rocks and the late Jurassic granites. The molybdenite is disseminated, veins and lump. Re-Os dating of six molybdenite samples collected from the main ore body in the deposit yields the model age from 150.1 Ma to 152.8 Ma, the isochron age of(150.8±1.6)Ma, and the weighted average age of(151.8±0.9)Ma. It can thus be considered that the deposit was formed in the late stage of Late Jurassic and related to the large-scale volcanic and intrusive rock activities. According to the rhenium content(14.31×10-6-45.8×10-6(one is 174.7×10-6))and the ratio of Re and Os(much greater than 4)of molybdenum samples, it is inferred that the ore-forming materials of the deposit were mainly derived from the crust and possible addition of small amount of mantle materials. The Qiucheng Mo deposit may be the product of conversion process from the end of collision to the beginning of extension of the Paleo-Pacific plate towards the continental margin of East Asia.
Key words:  Re-Os isochron age  molybdenite  porphyry molybdenum deposit  Qiucheng  Dehua of Fujian Province  mineral exploration