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海南岛罗葵洞钼矿床成岩成矿时代及矿床成因探讨
Age of host-rocks and mineralization from the Luokuidong molybdenum ore deposit in Hainan Island: Implication for deposit genesis

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文摘	罗葵洞钼矿床是海南岛目前发现的大型低品位、受火山机构控制的斑岩型钼矿床,其赋矿围岩主要为斑状花岗岩,其次为火山碎屑岩、石英二长斑岩等。本文分别对赋矿火山碎屑岩(流纹质晶屑凝灰熔岩)、斑状花岗岩及其边缘相石英二长斑岩进行了LA-ICP-MS锆石U-Pb定年,获得加权平均年龄分别为(104.1±0.7) Ma、 (102.4±0.5) Ma和(102.3±0.7) Ma;对7件辉钼矿进行Re-Os同位素定年,获得等时线年龄为(100.1±1.8) Ma,均为早白垩世晚期-晚白垩世早期的产物,成岩时代略早于成矿时代,表明钼矿化是继火山作用——岩体侵位后在较短时间内含矿岩浆热液活动的产物。由斑状花岗岩锆石Ti温度计获得的平均温度为690 ℃,近似代表花岗岩近液相线的温度,也近似代表岩浆起源时温度的最小值,表明其岩浆可能来源于在水近饱和条件下发生的部分熔融。罗葵洞矿床7件辉钼矿的Re含量为26.04~50.39 μg/g,表明成矿物质来源可能属于壳幔混合产物且以壳源为主。斑状花岗岩及其边缘相石英二长斑岩中的锆石Hf同位素组成较相似, ε_(Hf)(t)值分别为-5.38 ~ -2.2和-4.55 ~ 2.37,两者二阶段地壳模式年龄t_(DM2)范围为1016~1508 Ma,表明岩浆可能来源于中元古代古老下地壳的重熔,伴有部分幔源物质的加入。综合海南岛和国内其他钼矿床的成矿年龄和成矿岩体的年龄数据,发现华南钼成矿省中最年轻钼成矿事件发生在海南岛、且集中在白垩纪(约72~112 Ma),该时期对应于中国东部岩石圈大规模拉伸减薄的构造环境。
其他语种文摘	The Luokuidong porphyry Mo deposit in Hainan Island is a large-scale low-grade deposit, controlled by volcanic apparatus. LA-ICP-MS zircon U-Pb dating of host-rocks, which are volcaniclastic rock (rhyolitic crystal pyroclast tufflava), porphyritic granite, and its border facies masanophyre, yield weighted mean ages of (104.1±0.7) Ma, (102.4±0.5) Ma and (102.3±0.7) Ma, respectively. Furthermore, Re-Os dating of seven molybdenite samples separated from the Luokuidong Mo ore deposit yield an isochron age of (100.1±1.8) Ma, correlating with the late Early Cretaceous to early Late Cretaceous, whereas the host-rocks are a little earlier than the molybdenite. This indicates that mineralization is the product of ore-bearing hydrothermal activity occurring during a relatively short period after volcanism and pluton emplacement. Ti-in-zircons thermometry of porphyritic granite gives an average temperature of 690 ℃, approximately representing the near liquidus temperature of granite and the minimum temperature of magmatic origin, which implies that it is derived from rocks that experienced partial melting under near-water-saturated conditions. The Re content of molybdenite (26.04~50.39 μg/g) indicates the source of metallogenic material is possibly the mixture of mantle and crust, with crust as the dominant material. The zircons Hf isotope of porphyritic granite and its border facies masanophyre display similar signatures, with ε_(Hf)(t) values ranging from -5.38 to -2.2 and -4.55 to 2.37, respectively. The two-stage crust model ages (t_(DM2)) of the terrace vary from 1016 to 1508 Ma, indicating that the porphyritic granite and masanophyre were formed by remelting of the Mesoproterozoic lower crust with the addition of a certain amout of mantle-derived materials. The analysis of the ages of host-rocks and Mo mineralization in Hainan Island and inland China shows that the youngest ore-forming age of Mo metallogenic provinces in South China occurs in Hainan Island, and focus in Cretaceous (ca. 72~112 Ma) period, and possibly corresponds to the large-scale stretching and thinning tectonic setting occuring in Eastern China.
来源	地球化学 ,2018,47(3):268-287 【核心库】
DOI	10.19700/j.0379-1726.2018.03.004
关键词	锆石U-Pb年龄 ; Hf同位素 ; 锆石Ti温度计 ; 辉钼矿Re-Os年龄 ; 罗葵洞钼矿床 ; 海南岛
地址	1. 中国科学院广州地球化学研究所, 中国科学院矿物学与成矿学重点实验室, 广东, 广州, 510640 2. 中国科学院大学, 北京, 100049
语种	中文
文献类型	研究性论文
ISSN	0379-1726
学科	地质学
基金	国家重点研发计划深地资源勘查开采重点专项 ; 国土资源部全国矿产资源潜力评价项目
文献收藏号	CSCD:6243618

参考文献共 80 共4页

引证文献 3 篇

1 朱昱桦海南岛罗葵洞斑岩钼矿床地球化学特征及成矿物质来源地球科学,2020,45(4):1187-1212
被引 2 次

2 陈涛亮斑岩铜-钼成矿体系中铼含量分布特征及其制约因素探讨岩石学报,2021,37(9):2677-2690
被引 2 次

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论文科学数据集

1. 海南岛罗葵洞钼矿床成岩成矿年代学数据

2. 海南岛罗葵洞钼矿床赋矿围岩锆石Hf同位素数据

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海南岛罗葵洞钼矿床成岩成矿时代及矿床成因探讨 Age of host-rocks and mineralization from the Luokuidong molybdenum ore deposit in Hainan Island: Implication for deposit genesis

海南岛罗葵洞钼矿床成岩成矿时代及矿床成因探讨
Age of host-rocks and mineralization from the Luokuidong molybdenum ore deposit in Hainan Island: Implication for deposit genesis