新疆阿尔泰三叠纪锂矿化伟晶岩中热液成矿作用:来自单个流体包裹体组成LA-ICP-MS原位分析证据
Hydrothermal mineralization in Triassic Li-mineralized pegmatites in the Altay area of Xinjiang: Evidences from the in situ LA-ICP-MS analyses of individual fluid inclusions
查看参考文献48篇
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文摘
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选取可可托海3号脉石英-锂辉石带、卡鲁安806号脉、库卡拉盖650脉,开展石英、锂辉石中流体包裹体显微测温以及石英中捕获的单个流体包裹体组成的LA-ICP-MS原位分析。结果表明,锂矿化伟晶岩晚期出溶流体相为H_2O-NaCl-CO_2体系,石英中流体包裹体均一温度为233~407 ℃,盐度为5.77%~20.15%;w(Li)为1527×10~(-6)~17767×10~(-6)、w(Cs)为32×10~(-6)~4563×10~(-6)、w(Rb)为10×10~(-6)~100×10~(-6)。Li与Cs、Rb与Cs之间存在正相关系,并且Li/Rb与Li、Cs/Rb与Cs显示正相关关系,表明Li、Rb、Cs强烈分配进入流体相。流体包裹体中K/Na<0.4,指示锂矿化伟晶岩晚期分异出的流体显示富钠性质。26个流体包裹体LA-ICP-MS分析结果显示锂矿化伟晶岩晚期流体相中含有0.33%~3.82% Li_2O(w(Li_2O)平均值为1.10%),考虑到Li、Cs、Rb在流体/熔体间的分配系数>1,由此提出伟晶岩型锂床具有岩浆热液成因的可能性。 |
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其他语种文摘
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In this paper, the quartz-spodumene zone of the Koktokay No. 3 dyke, Kaluan No.806 dyke, and Kukalagai No.650 dyke were selected as research objects to have conducted the microthermometric measurements of fluid inclusions in their quartz and spodumene crystals and the LA-ICP-MS in-situ analyses of compositions of individual fluid inclusions in their quartz crystals. Results show that the exsolved fluid phase from the melt of Li-mineralized pegmatite in the late stage belongs to the H_2O-NaCl-CO_2 system. Fluid inclusions in quartz crystals have homogenization temperatures varying from 233 ℃ to 407 ℃, salinities varying from 5.77% to 20.15% NaCleqv., contents of Li, Cs, and Rb ranging from 1527×10~(-6) to 17767×10~(-6), from 32×10~(-6) to 4563×10~(-6), and from 10×10~(-6) to 100×10~(-6), respectively. There are positive relationships between Li and Cs contents, Rb and Cs contents, and Li/Rb ratios and Li contents, and Cs/Rb ratios and Cs contents, indicating that Li, Rb, and Cs were largely partitioned into the fluid phase. The K/Na ratios of the fluid inclusions are commonly less than 0.4, indicating that the exsolved fluid phase from the melt of Li-mineralized pegmatite in the late stage was rich in sodium. The LA-ICP-MS analytical results of 26 fluid inclusions show that the exsolved fluid phase from the melt of Li-mineralized pegmatite in the late stage contained Li_2O contents of 0.33%-3.82% (with the average of 1.10%). Considering that the partition coefficients of Li, Cs, and Rb between fluid and melt phases are greater than 1, it is proposed that the pegmatite-type lithium deposit could be originated from the magmatic hydrothermal metallogenesis. |
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来源
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矿物学报
,2023,43(1):25-37 【核心库】
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DOI
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10.16461/j.cnki.1000-4734.2022.42.077
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关键词
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流体组成
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流体包裹体
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LA-ICP-MS
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锂矿化伟晶岩
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新疆阿尔泰
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地址
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中国科学院地球化学研究所, 中国科学院地球内部物质与高温高压重点实验室, 贵州, 贵阳, 550081
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中国科学院大学, 北京, 100049
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-4734 |
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学科
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地质学 |
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基金
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国家自然科学基金项目
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中国科学院战略性先导科技专项
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文献收藏号
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CSCD:7509816
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