矿床地质2017，Vol.36Issue(2)：303-316,14.DOI:10.16111/j.0258-7106.2017.02.003
海南省新村钼矿床LA-ICP-MS锆石U-Pb和辉钼矿Re-Os年龄及其地质意义
LA-ICP-MS zircon U-Pb and molybdenite Re-Os dating of Xincun Mo ore deposit in Hainan Province and its geological significance
摘要
Abstract
The Xincun Mo ore deposit is a newly discovered medium-size deposit in Hainan Province.The LA-ICP-MS zircon U-Pb analysis of monzonite yielded a weighted 206 pb/238U mean age of (102.0 ± 1.5) Ma (MSWD =2.3).Re-Os dating of five molybdenite samples separated from the Xincun Mo ore deposit yielded model ages from (97.29 ± 1.43) Ma to (98.52 ± 1.55) Ma,a weighted average age of (97.84 ± 0.64) Ma and an isochron age of (98.90 ± 3.40) Ma.These ages suggest that the mineralization in the Xincun Mo ore deposit was genetically associated with the monzonite,and the rock-and ore-forming process was continuous.The Re content of molybdenite and Hf isotopic compositions of zircon imply that the rock-and ore-forming materials were derived from the mixture of the mantle and the crust.These data indicate that the ages of the intrusion and orebody from the Xincun Mo ore deposit are identical with those (95～105 Ma) of most Mo deposits in Hainan Province,being part of the molybdenum mineralization event in the period of the late stage of early Cretaceous and the early stage of late Cretaceous in eastern China.Accordingly,the metallogenic geodynamical setting of the Xincun Mo ore deposit might have been related to a pull-apart and stretching environment accompanied by asthenosphere upwelling and strong crust-mantle interaction.关键词
地球化学/LA-ICP-MS锆石U-Pb年龄/辉钼矿Re-Os年龄/Hf同位素/成矿背景/新村钼矿床/海南省Key words
geochemistry/LA-ICP-MS zircon U-Pb age/molybdenite Re-Os age/Hf isotopic compositions/metallogenic setting/Xincun Mo ore deposit/Hainan Province分类
天文与地球科学引用本文复制引用
胡军,徐德明,张鲲,王磊,陈沐龙,云平..海南省新村钼矿床LA-ICP-MS锆石U-Pb和辉钼矿Re-Os年龄及其地质意义[J].矿床地质,2017,36(2):303-316,14.基金项目
本文得到中国地质调查局地质矿产调查项目(编号:12120113067200、DD20160035)资助 （编号:12120113067200、DD20160035）
