滇东-黔西地区峨眉山玄武岩Nb-Ga-REE富集机制及赋存状态初步研究
A Preliminary Study on the Possible Mechanism of Enrichment and Occurrence State of Nb-Ga-REE in the Emeishan Basalts from the Diandong-Qianxi Region
查看参考文献40篇
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文摘
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滇东-黔西地区的宣威组底部广泛发育一套Nb-Ga-REE多金属矿化富集层,其底板为峨眉山玄武岩。为探讨峨眉山玄武岩与该矿化层的成因联系,对玄武岩进行了主、微量元素分析测试,对Nb、Ga、REE的富集机制及赋存状态进行了研究。结果表明,与其他地区相比,滇东-黔西地区峨眉山玄武岩的P、Ti含量高且富集REE、Nb、Ga等成矿元素,这与橄榄石、辉石、斜长石等矿物的大量分离结晶有关。另外,玄武岩喷发后的冷凝过程中单斜辉石、斜长石、Fe-Ti氧化物快速结晶,从而导致仅占基质10%~ 30%的磷灰石、榍石及隐晶质/玻璃质高度富集REE、Nb、Zr、Ga等成矿元素。这些矿物在后期风化淋滤过程中形成黏土矿物,成为宣威组底部Nb-Ga-REE多金属矿化富集层的主要成矿物质来源。 |
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其他语种文摘
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An Nb-Ga-REE mineralized layer widely occurred in the bottom part of the Xuanwei formation within the Diandong- Qianxi area. Its floor is the Emeishan basalt. In order to discuss the possible role of the basal Emeishan basalts to the generation of this Nb-Ga-REE mineralized layer,a preliminary study on the possible mechanism of enrichment and occurrence state of Nb-Ga-REE in the Emeishan basalts from the Diandong-Qianxi region has been carried out in this paper. The results show that the Emeishan basalts from the Diandong-Qianxi region are relatively enriched in P,Ti,and oreforming elements of REE,Nb,and Ga,compared with those from other areas. The enrichment of P,Ti,REE,Nb and Ga could be attributed to the fractional crystallization of a large amount of olivine,pyroxene and plagioclase. In addition,the fast crystallization of plagioclase,clinopyroxene,and Fe-Ti oxides during the magma cooling after eruption results in the high enrichment of ore-forming elements including REE,Nb,Zr,and Ga in apatite,sphene and glass,which are only 10 to 30% out of the total matrix of basalt. These minerals may be weathered to clay minerals during later weathering and leaching process to become the main source of ore-forming materials of the Nb-Ga-REE mineralized layer in the bottom part of Xuanwei formation. |
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来源
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矿物岩石地球化学通报
,2020,39(6):1256-1277 【核心库】
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DOI
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10.19658/j.issn.1007-2802.2020.39.069
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关键词
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Nb-Ga-REE
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峨眉山玄武岩
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滇东-黔西
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岩浆演化
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地幔柱
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地址
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中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 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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1007-2802 |
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学科
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地质学 |
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基金
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国家重点研发计划重点专项
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南方海洋科学与工程广东省实验室重大专项团队项目
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国家自然科学基金项目
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中国科学院西部青年学者A类项目
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贵州省项目
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文献收藏号
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CSCD:6885171
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