| 福建将乐新路口花岗岩体地球化学特征、锆石U-Pb年龄及成矿意义 |
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| 作者姓名： | 李学燮 |
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| 作者单位： | 福建省地质调查研究院,福州,350013 |
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| 基金项目： | 福建省地质矿产勘查开发局“闽西南地区锡多金属矿特征及找矿前景分析 |
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| 摘 要： | 通过研究福建省将乐新路口花岗岩体岩石学、地球化学和同位素年代学特征,探讨了该岩体的形成时代、岩浆成因及与钨锡矿的成矿关系。新路口花岗岩体高硅,属于准铝质-过铝质花岗岩;富碱质,贫铁镁,Ba、Sr、P、Ti和Nb强烈亏损,球粒陨石标准化稀土元素配分模型为Eu强烈亏损的“海鸥型”,属于高分异S型花岗岩。Nd同位素研究表明,该花岗岩体主要源自地壳。LA-ICP-MS锆石U-Pb年龄结果表明,该岩体形成时代为147~145Ma,属晚侏罗世,钨锡矿的成矿时代也为晚侏罗世,是伸展构造环境下构造-岩浆活动的产物。经历新元古代和志留纪岩浆作用后形成富含钨锡的残留体,晚侏罗世岩浆热液活动对残留体再次熔融,形成富含硅、碱质及F的岩浆-热液,钨锡从残余矿物中迁移,聚集于岩浆房中,经过结晶分异,形成富含矿质的高分异岩浆,沿构造有利部位向浅部运移、结晶,形成钨锡矿体。
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| 关 键 词： | 花岗岩体 LA-ICP-MS锆石U-PB定年 钨锡矿 福建将乐 |
| 收稿时间： | 2018-03-13 |
| 修稿时间： | 2018-09-20 |
Geochemistry and zircon U-Pb age of the Xinlukou granite in JiangleCounty,Fujian Province and their mineralization significances |
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| Authors: | LI Xue-xie |
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| Institution: | (Fujian Institute of Geological Survey, Fuzhou 350013, China) |
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| Abstract: | This study discussed the forming age and magmatic origin of the Xinlukou granite in Jiangle,Fujian Provine,and its relation to tungsten-tin mineralization using analysis of lithology,geochemisty and isotopic chronology.The results show that the Xinlukou granite is high in silicate,metaluminous-peraluminous,rich in alkaline,poor in iron and magnesium,strongly depleted in Ba,Sr,P,Ti and Nb.The chondrite normalized REE distribution diagram presents a seagull pattern with strong Eu depletion,suggesting highly fractionated S-type granite.Nd isotopic analysis shows the granite sourced mainly from crust.LA-ICP-MS zircon U-Pb dating indicates the granite formed at 147~145 Ma,Late Jurassic.The tungsten-tin deposit also formed in the Late Jurassic and was the product of the tectonic and magmatic activity in the extensional tectonic environment of Late Jurassic.Experiencing the Neoproterozoic and Silurian magmatism,the newly-formed W-Sn enriched residues was re-melted into Si-rich,alkali-rich and F-rich magma and hydrothermal fluid,from which W and Sn were extracted to accumulate in magmatic chambers.Fractional crystallization resulted in the formation of highly fractionated magma rich in ore-bearing materials,which migrated into along preferential structures and crystallize to form W-and Sn-beairng orebodies at shallow part. |
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| Keywords: | granites LA-ICP-MS zircon U-Pb dating tungsten-tin ore Jiangle Fujian |
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