| 湖南杏枫山钨矿床热液榍石的地球化学特征、U-Pb定年及其地质意义 |
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| 引用本文： | 吕沅峻,彭建堂,蔡亚飞.湖南杏枫山钨矿床热液榍石的地球化学特征、U-Pb定年及其地质意义[J].岩石学报,2021,37(3):830-846. |
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| 作者姓名： | 吕沅峻 彭建堂 蔡亚飞 |
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| 作者单位： | 中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵阳 550002;中国科学院大学地球与行星科学学院, 北京 100049;中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵阳 550002;中南大学地球科学与信息物理学院, 有色金属成矿预测教育部重点实验室, 长沙 410083 |
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| 基金项目： | 本文受国家自然科学基金项目（41972090）和国家重点研发计划项目（2018YFC0603500）联合资助. |
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| 摘 要： | 杏枫山钨矿床是湘中地区近年新发现的、产出于浅变质岩系中的矽卡岩型钨矿。本文通过电子探针与LA-ICP-MS等技术手段,对杏枫山矿区矽卡岩中的热液榍石进行了主、微量元素组成以及U-Pb年代学研究。研究表明,榍石具有以下特征:(1)较低的∑REE、Ti O2含量,极低的Th/U,以及较高的Al_2O_3和F含量,这些均为典型热液榍石的地球化学特征;(2)富W而亏损Mo,表明其形成的热液流体具有富W贫Mo的特征;(3)稀土配分模式为左倾的、轻稀土显著亏损的重稀土富集型,正Ce、Eu异常表明其形成环境较为还原。此外,榍石原位U-Pb定年结果显示该矿形成于215.2±2.7Ma,与邻近白马山钛铁矿花岗岩形成的时间一致,基于地质及年代学证据,我们认为该矿的形成与白马山印支期的岩浆热液活动有关。结合前人的研究结果,我们发现湘中地区钨成矿与印支期还原性花岗质岩浆岩密切相关,为湘中印支晚期区域性成矿作用的产物。
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| 关 键 词： | 榍石 湘中 矽卡岩钨矿 杏枫山 LA-ICP-MS U-Pb定年 |
| 收稿时间： | 2020/11/11 0:00:00 |
| 修稿时间： | 2021/2/9 0:00:00 |
Geochemical characteristics, U-Pb dating of hydrothermal titanite from the Xingfengshan tungsten deposit in Hunan Province and their geological significance |
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| LV YuanJun,PENG JianTang,CAI YaFei.Geochemical characteristics, U-Pb dating of hydrothermal titanite from the Xingfengshan tungsten deposit in Hunan Province and their geological significance[J].Acta Petrologica Sinica,2021,37(3):830-846. |
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| Authors: | LV YuanJun PENG JianTang CAI YaFei |
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| Institution: | State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002;College of Earth and Planetary Science, University of Chinese Academy of Sciences, Beijing 100049, China;State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002;MOE Key Laboratory of Non-ferrous Metals Metallogenic Prediction, School of Geosciences and Info-physics, Central South University, Changsha 410083, China |
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| Abstract: | The Xingfengshan skarn-type tungsten deposit,hosted in low grade metamorphic rocks,was discovered in Xiangzhong region recently.In this paper,major and trace element compositions,U-Pb dating of the hydrothermal titanite from the Xingfengshan skarn were analyzed by EPMA and LA-ICP-MS.The results show that the titanite possesses relatively low∑REE,Ti O2 contents and Th/U ratio,and high Al2O3 and F contents,i.e.,it belongs to typical hydrothermal titanite.The enrichment of W and depletion of Mo in the titanite suggest the hydrothermal fluid was rich in W and poor in Mo.The chondrite-normalized REE pattern of the titanite displays HREE enriched with obvious Ce and Eu positive anomalies,suggesting it formed under reduced environment.In-situ U-Pb dating of the titanite yields the intercept age of 215.2±2.7 Ma,indicating the skarn tungsten deposit formed synchronously with the adjacent Baimashan ilmenite-type granitoid.Based on geological and geochronological evidences,we conclude that the deposit was genetically related to Baimashan magmatic-hydrothermal event in Indosinian.Combined with previous research,it is revealed that tungsten mineralization in Xiangzhong region is closely associated with Indosinian reduced granitoid and is a part of Late Indosinian regional mineralization event that took placed in the study region. |
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| Keywords: | Titanite Xiangzhong Skarn tungsten deposit Xingfengshan U-Pb dating |
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