| 赣南鹅婆岩体的年代学和岩石地球化学特征及其地质意义 |
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| 引用本文： | 郭娜欣,赵正,陈振宇,陈毓川,侯可军,王少轶.赣南鹅婆岩体的年代学和岩石地球化学特征及其地质意义[J].岩矿测试,2014,33(4):589-597. |
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| 作者姓名： | 郭娜欣 赵正 陈振宇 陈毓川 侯可军 王少轶 |
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| 作者单位： | 中国地质科学院, 北京 100037;国土资源部成矿作用与资源评价重点实验室, 中国地质科学院矿产资源研究所, 北京 100037;国土资源部成矿作用与资源评价重点实验室, 中国地质科学院矿产资源研究所, 北京 100037;国土资源部成矿作用与资源评价重点实验室, 中国地质科学院矿产资源研究所, 北京 100037;中国地质科学院, 北京 100037;国土资源部成矿作用与资源评价重点实验室, 中国地质科学院矿产资源研究所, 北京 100037;中国地质大学(北京)地球科学与资源学院, 北京 100083 |
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| 基金项目： | 中国地质调查局“南岭地区岩浆岩成矿专属性研究”（资[2010]矿评01-26-07），深部探测实验研究“南岭于都—赣县矿集区立体探测技术与深部成矿预测示范”（SinoProbe-03-03），“南岭于都—赣县矿集区科学钻探选址预研究”（201011064-3/4/5）；国家自然科学基金（41372092）；中央公益性科研院所基金（K1303） |
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| 摘 要： | 赣南鹅婆岩体位于南岭东西向构造岩浆带与武夷山北北东向构造带结合部位,地处于都—青塘古生代盆地西缘,出露面积达200 km2。岩体主体为黑云母二长花岗岩,其构造位置特殊,周边成矿条件有利,西侧银坑矿田内部和外围分别发育金银铅锌贵多金属矿和钨多金属矿。本文在岩体地质工作的基础上,应用激光剥蚀多接收器电感耦合等离子体质谱(LA-MC-ICP-MS)技术对鹅婆黑云母二长花岗岩进行了锆石U-Pb定年;结合元素地球化学数据讨论了其岩浆系列和岩石成因;并与区内成矿岩浆岩进行对比,探讨其成矿潜力。鹅婆花岗岩体的侵入年龄为(412.5±1.7)Ma,花岗岩中含富铝矿物,主量和微量元素地球化学显示其属于高钾钙碱性-钾玄岩系列,为强过铝质的S型花岗岩,是新元古代壳层沉积变质泥岩在加里东晚期重熔侵入的产物。与加里东期和燕山期成钨锡花岗岩的对比研究表明,鹅婆岩体在形成过程中发生了W、Sn等成矿元素的富集。本文研究结果一方面证明前人获得的全岩Rb-Sr等时线年龄(307 Ma)代表的是成岩期后所经历的一次地质事件;同时表明加里东期花岗岩也有钨锡矿成矿的潜力。
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| 关 键 词： | 赣南 鹅婆岩体 LA-MC-ICP-MS 加里东晚期 成矿作用 |
| 收稿时间： | 2013/9/11 0:00:00 |
| 修稿时间： | 2014/4/16 0:00:00 |
Chronology, Geochemistry and Geological Significance of Epo Granite Intrusion, Southern Jiangxi |
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| GUO Na-xin,ZHAO Zheng,CHEN Zhen-yu,CHEN Yu-chuan,HOU Ke-jun and WANG Shao-yi.Chronology, Geochemistry and Geological Significance of Epo Granite Intrusion, Southern Jiangxi[J].Rock and Mineral Analysis,2014,33(4):589-597. |
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| Authors: | GUO Na-xin ZHAO Zheng CHEN Zhen-yu CHEN Yu-chuan HOU Ke-jun and WANG Shao-yi |
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| Institution: | Chinese Academy of Geological Sciences, Beijing 100037, China;Key Laboratory of Metallogeny and Mineral Assessment, Ministry of Land and Resources, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;Key Laboratory of Metallogeny and Mineral Assessment, Ministry of Land and Resources, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;Key Laboratory of Metallogeny and Mineral Assessment, Ministry of Land and Resources, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;Chinese Academy of Geological Sciences, Beijing 100037, China;Key Laboratory of Metallogeny and Mineral Assessment, Ministry of Land and Resources, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China |
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| Abstract: | The Epo intrusion with an exposed area of 200 km2, is mainly composed of biotite monzonitic granite, and is located on the western margin of the Yudu-Qingtang basin, the conjunction of E-W trending Nanling tectonic-magmatic belt and the NNE trending Wuyishan tectonic belt. Situated in such a special tectonic position, this region is advantageous to mineralization. The Yinkeng ore field, which lies to the west of the Epo intrusion, consists of Au-Ag-Pb-Zn and W polymetallic deposits. On the basis of field survey, zircon U-Pb dating for Epo biotite monzonitic granite has been carried out by Laser Ablation-Multicollector-Inductively Coupled Plasma-Mass Spectrometry (LA-MC-ICP-MS). Magma series and petrogenesis have been discussed according to geochemical data, and metallogenetic potentiality of the intrusion has been studied by comparing with other metallogenetic granitic bodies in the district. Analysis results show that the diagenetic age of Epo granite is (412.5±1.7) Ma. The granite contains abundant aluminium minerals, such as muscovite and sillimanite. Major and trace elements indicate that Epo granite is strongly peraluminous S-type granite, and belongs to the High potassium calc alkaline-shoshonite series. The pluton stemmed from Neoproterozoic metamorphic shale by remelting and intruding during the Late Caledonian period. Comparative research with Caledonian and Yanshanian W-Sn metallogenetic granites shows that W and Sn had been concentrated during the formation of Epo granite. Proof that the previous Rb-Sr whole rock isochron age (307 Ma) represents a late geological event after the diagenesis period is given in this paper, and Caledonian granites have potential for W-Sn mineralization. |
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| Keywords: | southern Jiangxi Epo intrusion LA-MC-ICP-MS Late Caledonian metallogenesis |
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