| 松树岗钽铌钨锡矿床石英脉的矿物学研究——云母和黑钨矿成分对热液成矿过程的制约 |
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| 引用本文： | 薛荣,王汝成,陈光弘,车旭东,谢磊,诸泽颖.松树岗钽铌钨锡矿床石英脉的矿物学研究——云母和黑钨矿成分对热液成矿过程的制约[J].岩石矿物学杂志,2019,38(4):507-520. |
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| 作者姓名： | 薛荣 王汝成 陈光弘 车旭东 谢磊 诸泽颖 |
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| 作者单位： | 内生金属矿床成矿机制研究国家重点实验室南京大学地球科学与工程学院 |
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| 基金项目： | 国家自然科学基金资助项目（41230315，41572045） |
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| 摘 要： | 矿石矿物和脉石矿物的成分演化蕴含了热液成矿过程的详细信息。本文基于岩相学观察,从云母和黑钨矿着手,利用电子探针和LA-ICP-MS分析技术,对赣东北松树岗Ta-Nb-W-Sn矿床的浅部热液成矿过程开展了研究。结果表明,松树岗矿床浅部的钨锡矿体的石英脉,从早到晚,由深至浅,可以划分为黑钨矿石英脉、锡石石英脉、硫化物石英脉和贫矿石英脉。4类石英脉中都含有早期的铁锂云母和晚期的白云母与铁的氧化物集合体,深部早期脉中的云母以铁锂云母为主,而浅部晚期脉中的云母以白云母为主。与早期铁锂云母相比,晚期白云母具有明显较低的Ti、Na、Rb、Cs、W、Nb、Zn、Li_2O含量和明显较高的Pb、Cu、B含量。从深部早期脉到浅部晚期脉,云母成分存在如下演化趋势:Ti、Na、W、Nb含量降低,Pb、Zn、Cu、Li_2O、B含量增高。不同深度的黑钨矿石英脉中含有两种不同成分的黑钨矿,属同一期演化早晚形成。相对于热液流体早期沉淀的黑钨矿,晚期黑钨矿具有明显较低的Nb、Ta、Zr、Hf、Ti、Sn、U、In、Sc含量和明显较高的Mo含量和Fe O/MnO值。云母和黑钨矿主微量元素成分的演化揭示了在松树岗矿床浅部的热液成矿早期以岩浆热液为主,晚期由于水岩反应的加强有较多围岩物质贡献。
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| 关 键 词： | 云母 黑钨矿 热液充填 水岩反应 松树岗 |
| 收稿时间： | 2019/3/7 0:00:00 |
Compositional constraints of mica and wolframite on hydrothermal ore-forming process of the Songshugang Ta-Nb-W-Sn deposit, northeastern Jiangxi |
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| XUE Rong,WANG Ru-cheng,CHEN Guang-hong,CHE Xu-dong,XIE Lei and ZHU Ze-ying.Compositional constraints of mica and wolframite on hydrothermal ore-forming process of the Songshugang Ta-Nb-W-Sn deposit, northeastern Jiangxi[J].Acta Petrologica Et Mineralogica,2019,38(4):507-520. |
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| Authors: | XUE Rong WANG Ru-cheng CHEN Guang-hong CHE Xu-dong XIE Lei and ZHU Ze-ying |
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| Institution: | State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China,State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China,State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China,State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China,State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China and State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China |
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| Abstract: | The compositional evolution of ore and gangue minerals has recorded detailed information concerning the hydrothermal mineralization process. Based on petrographic observation, the authors used the combined EMP and LA-ICP-MS analytical techniques for mica and wolframite to constrain the shallow hydrothermal mineralization process of the Songshugang Ta-Nb-W-Sn deposit in northeastern Jiangxi Province. The W-Sn orebody in the shallow part of the Songshugang deposit contains four different types of quartz veins from early stage to late stage and from deep to shallow:wolframite-quartz vein, cassiterite-quartz vein, sulfide-quartz vein and barren vein, respectively. The four types of quartz veins all contain early crystallized zinnwaldite and late formed muscovite-iron oxides. The mica in the early veins is mainly zinnwaldite, while the mica in the late-stage veins is dominated by muscovite. Compared with the chemical compositions of zinnwaldite, the muscovite contains less Ti, Na, Rb, Cs, W, Nb, Zn, Li2O but significantly higher Pb, Cu and B. From the early veins to the late veins, the mica compositions have following variable trends:Ti, Na, W, Nb concentrations decrease, and Pb, Zn, Cu, Li2O, B concentrations increase. Wolframite-quartz veins of different depths contain two different compositions of wolframite, but they belong to the same period of evolution. Compared with wolframite deposited early in the hydrothermal fluid, the late wolframite has a significantly lower Nb, Ta, Zr, Hf, Ti, Sn, U, In, and Sc but higher Mo and FeO/MnO ratio. The evolution of trace elements in mica and wolframite implies two different fluids involved in the hydrothermal mineralization process. One was granite-related hydrothermal fluid and the other originated from water-rock reactions. In the early stage of mineralization, magmatic hydrothermal crystallization was dominant, and in the late stage, due to the intensification of water-rock reaction, surrounding rock materials made more contribution. |
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| Keywords: | mica wolframite hydrothermal fluid infilling water-rock interaction Songshugang |
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