海南省保亭县新村钼矿地质特征及成因探讨

Geological Characteristics and Genesis of Xincun Molybdenum Deposit in Baoting County,Hainan Province

新村钼矿位于海南省保亭县境内，是在海南省发现的又一个达中型规模的钼矿床。矿体主要赋存在次火山岩带中，矿石类型主要有细脉浸染型和石英脉型两种。辉钼矿Re—Os测年研究获得95．6±0．89～97．8±0．5Ma和112．3±4．2Ma的模式年龄，表明矿区可能经历两期矿化，它们可能分别与保城岩体侵位和火山活动有关。硫同位素研究显示，主要的硫源为岩浆源。通过地质资料综合分析，表明新村钼矿为次火山岩容矿，为岩浆后期热液作用形成的热液脉型钼矿床。

The Xincun molybdenum deposit, located at the Baoting county, is another mid-sized deposit discovered in Hainan island. Molybdenum ores can be divided into quartz vein-type and veinlet- disseminated-type, which are hosted by subvoleanie rocks. Molybdenite separated from ores yield Re-Os model age of 95.6±0.89 - 97.8±0.5 Ma and 112.3±4.2 Ma, suggested that there had ever experienced two stages of molybdenum mineralization. The mineralization of former ages is considered to be related to the intrusion of Baocheng plutons, and the mineralization of older age is probably related to the Late-Yanshanian terrestrial faces volcanism during 122- 107 Ma. The measured δ34S values suggest that the formation of Mo ore-body is closely related to contemporary magmatism. Based on synthetic studies of geological and geochemical information, we consider that the Xineun Mo deposit is a volcanic-hosted deposit which is formed by the post-stage magmatic hydrothermal activity.