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摘要: 幕阜山地区复式花岗岩内部和外缘接触带中发育大量伟晶岩脉，绿柱石矿物局部富集。断峰山、下麦窝和大坳等地的斜长石-石英伟晶岩脉中，可以见到聚集状产出的绿柱石。电子探针测试后换算结果显示，这些绿柱石的平均化学式为(Be2.952, Li0.048)Al2.000[Si5.983O18]·0.035H2O，富碱金属元素，贫镁铁锰。绿柱石中发育大量包裹体，通常沿着主晶体C轴方向定向排列分布。气相、液相和固相三种包裹体同时存在，常见气液两相共存，偶见三相包裹体。激光拉曼探针测量数据显示，这些包裹体主要为气液相流体，富含CO2、N2、H2O等。幕阜山地区伟晶岩中的铍矿化可能与复式花岗岩体演化晚期的热液活动密切相关，大量流体活动有利于促进化学分异和稀有金属元素运移、富集和沉淀，从而局部富集巨晶绿柱石。Abstract: Granitic pegmatite veins are widely distributed in the inner and adjacent region of the Mufushan granitic complex, where beryl is locally concentrated. In this study, centimeter-sized gem beryl crystals were collected from plagioclase-quartz pegmatites from the Duanfengshan, Xiamaiwo and Da’ao areas. The calculated chemical formula based on EPMA data is (Be2.952, Li0.048)Al2.000[Si5.983O18]·0.035H2O, which indicates enriched alkali metals of Be and Li with very low content of Mg, Fe and Mn elements. Abundant oriented fluid inclusions are founded in the studied beryl samples, including gas, liquid and solid phases. Most of these inclusions occur as single phases, while a handful of double-phase or triple-phase inclusions have also been found. Laser Raman investigations indicate that most of these inclusions are liquid and gas fluids, including CO2, N2 and H2O. The results suggest that the beryllium mineralization in pegmatites of the Mufushan area is probably related to the late-stage hydrothermal activity of the granitic complex. Abundant fluid inclusions found in the beryl crystals indicate that fluid activity could promote the chemical differentiation, migration, enrichment and precipitation of rare metal elements, therefore resulting in the local enrichment of mega-crystal beryl.
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Key words:
- beryl /
- inclusion /
- granitic pegmatite /
- Mufushan
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