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摘要: 通过对塔里木盆地西克尔地区萤石矿及赋矿围岩进行地球化学分析,探讨该区萤石矿成因。研究表明,萤石矿物稀土元素配分模式图表现出轻稀土元素相对富集,正铕异常特点;微量元素分析显示Eu、Sr、Ba具有相关性;Sr同位素比值与围岩相近。最终认为萤石矿成矿流体主要来自于加热的盆地卤水,微量(包括稀土)元素来自下伏地层及围岩,Ba、Eu、F等元素可能来自下寒武统硅质岩及磷块岩。
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关键词:
- 塔里木萤石稀土元素正铕异常热水沉积
Abstract: Geochemistry of fluorite deposits and its ore rocks in Sickl area, Tarim Basin is applied to investigate the ingenesis. The study shows that: relative LREE concentration and positive Eu anomaly are resulted from REE distribution pattern diagrams of fluorite; Eu, Sr and Ba are related closely in trace element analysis; the isotope ratio of Sr in fluorite is close to that in surrounding rocks. Conclusions are: oreforming fluids of the fluorite mainly are from the infiltration of heated basin brine ; trace elements(including REE) are from underlying strata and surrounding rocks; and elementsF, Ba, Eu are from Lower Cambrian siliceous rocks and phosphorite.-
Key words:
- Tarim
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