投稿时间：2016-06-28
修订日期：2017-08-10
网络发布日期：2017-12-28
中文摘要:通过对平和包围山钼矿床成矿岩体、赋矿火山岩及辉钼矿开展同位素年代学研究，结果表明：包围山深部花岗斑岩LA-ICP-MS锆石U-Pb年龄为（98.1±1.1）Ma，容矿围岩-石帽山群底部凝灰熔岩成岩年龄为（104.6±1.1）Ma；矿体中辉钼矿的Re-Os同位素模式年龄为（95.2±1.5）Ma。辉钼矿中Re的含量指示成矿来源与壳幔物质混合或幔源物质进一步演化有关。结合矿床地质特征及已有的研究成果，笔者认为包围山钼矿床的形成可能与125~92 Ma古太平洋板块的俯冲作用机制有关。受该期区域伸展构造背景的影响，上杭-云霄成矿带下地壳或上地幔部分熔融诱发了平和包围山一带岩浆-热液-成矿事件。
中文关键词:地球化学 锆石U-Pb年龄 Re-Os同位素年龄 包围山钼矿床 福建
Abstract:Based on isotopic chronological study of the ore-forming rock body, ore-bearing volcanic rocks and molybdenite from the Baoweishan molybdenum deposit in Pinghe County, the authors conducted LA-ICP-MS zircon U-Pb dating and revealed that the age of the Baoweishan porphyry-like granite is (98.1±1.1) Ma, and the age of the tuff-lava in the bottom of the "Shimaoshan Group" formation, which is the host rock of this deposit, is (104.6±1.1) Ma. Re-Os dating of molybdenite from the orebodies yielded a model age of (95.2±1.5) Ma. These age data indicate that the Baoweishan molybdenum deposit was formed at the early stage of late Cretaceous. Furthermore, the rhenium values of molybdenum samples from the deposit indicate that the mineralization is genetically closely related to the crust-mantle or the further evolution of the mantle. Based on geological features of the Baoweishan molybdenum deposit and the research results in this study, the authors consider that this deposit was probably generated in an extensional setting related to the subduction process of the Paleo-Pacific plate beneath the Eurasian continent during 125~92 Ma, which triggered the partial melting of the lower crust or the upper lithospheric mantle to form the magmatic-hydrothermal ore-forming event in Baoweishan area along the Shanghang-Yunxiao ore-forming belt.
文章编号：
中图分类号：P618.65
文献标志码：
基金项目:中国地质调查局地质调查（编号：12120113089600，12120114028701）项目资助
引用文本：
潘天望,张达,沈荣泉,陈泉流,袁远,高孝巧,狄永军.2017.福建平和包围山钼矿床锆石U-Pb和辉钼矿Re-Os年龄及其地质意义[J].矿床地质,36(6):1316~1332PAN TianWang,ZHANG Da,SHEN RongQuan,CHEN QuanLiu,YUAN Yuan,GAO XiaoQiao,DI YongJun.2017.Zircon U-Pb and molybdenite Re-Os dating of Baoweishan molybdenum deposit in Pinghe County, Fujian Province, and its geological significance[J].Mineral Deposits36(6):1316~1332
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