矿床地质2017，Vol.36Issue(1)：185-199,15.DOI:10.16111/j.0258-7106.2017.01.012
海南岛高通岭钼矿床赋矿岩体LA-ICP-MS锆石U-Pb年龄、Hf同位素和Ce4+/Ce3+特征
LA-ICP-MS zircon U-Pb dating, Hf isotopic composition and Ce4+/Ce3+ characteristics of Gaotongling molybdenum ore deposit in Hainan Province and their implications for metallogeny
摘要
Abstract
The Gaotongling molybdenum ore deposit classified as the quartz vein type ore deposit is located in the central area of the Hainan Island.It is hosted in the Cretaceous granite named Gaotongling terrace.In order to investigate mineral composition,metallogenic age and metallogenic source of the Gaotongling molybdenum deposit,the authors conducted petrographic observations,LA-ICP-MS zircon U-Pb dating,zircon in situ Lu-Hf isotope analysis and trace elements analysis of the ore-hosting rocks.The ore-hosting rocks are medium-coarse grained biotite moyite,and the ore types can be divided into quartz vein type molybdenite ore,altered moyite type molybdenite ore and cataclastic rock type molybdenite ore.LA-ICP-MS zircon dating of biotite moyite rock yielded 206U/238Pb ages varying from 105.10 Ma to 99.89 Ma with weighted average age of (102.5 ± 1.8) Ma.LA-ICP-MS zircon Hf isotopic analyses show εHf(t) values of biotite moyite rocks from-12.8 to-1.7.The two-stage crust model ages (TCDM) of Gaotongling terrace vary from 1976 Ma to 1271 Ma,with the peaks from 1450 Ma to 1400 Ma.Combined with REE characteristics of zircons,the authors hold that the Gaotongling rocks belong to continental crust.Early Gaotongling granite rocks have low Ce4+/Ce3+ ratios (around 160),reflecting a low oxygen fugacity,whereas Gaotongling granite samples collected from the drill hole have high Ce4+/Ce3+ ratios (377 on average),showing a higher oxygen fugacity.Gaotongling granites possess confined metallogenic capacity.关键词
地球化学/锆石U-Pb定年/Hf同位素/Ce4+/Ce3+比值/高通岭钼矿床Key words
geochemistry/zircon U-Pb dating/Hf isotope/Ce4+/Ce3+ ratio/Gaotongling molybdenum deposit分类
天文与地球科学引用本文复制引用
朱昱桦,于亮亮,于得水,许德如,付王伟..海南岛高通岭钼矿床赋矿岩体LA-ICP-MS锆石U-Pb年龄、Hf同位素和Ce4+/Ce3+特征[J].矿床地质,2017,36(1):185-199,15.基金项目
本文受到国家重点研发计划“深地资源勘查开采”(编号:2016YFC0600401)重点专项和国土资源部全国矿产资源潜力评价项目(编号:1212010881625)资助 （编号:2016YFC0600401）
