| 布拖小洞子萤石矿床稀土元素地球化学特征及意义 |
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| 引用本文： | 罗丽萍,谭洪旗,胡军亮,谢海峰,张伟. 布拖小洞子萤石矿床稀土元素地球化学特征及意义[J]. 四川地质学报, 2020, 40(1): 45-50 |
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| 作者姓名： | 罗丽萍 谭洪旗 胡军亮 谢海峰 张伟 |
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| 作者单位： | 中国地质科学院矿产综合利用研究所,成都, 610041;中国地质科学院矿产综合利用研究所,成都, 610041;成都理工大学地球科学学院,成都, 610059;成都理工大学地球科学学院,成都, 610059;四川省地矿局化探队,四川德阳618000 |
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| 基金项目： | 中国地质调查局项目(项目编号:DD20190185)资助。 |
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| 摘 要： | 萤石经常以脉石矿物存在于各类金属矿床中,但以矿石矿物与金属矿物共存较为少见。布拖小洞子铅锌矿体和萤石矿体是赋存在震旦系灯影组不同部位的典型矿床,受四开-交际河断裂的次级断层带控制,是该区较为特殊,研究程度较低的一类矿床。其中萤石矿床产于与黑色燧石条带白云岩相关的断裂构造,矿石矿物以萤石为主。本文通过对震旦系灯影组下部萤石矿床开展稀土元素地球化学研究,结果表明轻稀土元素富集,重稀土元素略亏损,LREE/HREE介于0.96~1.61,(La/Yb)_N为1.19~3.23,稀土元素配分图表现出略微右倾的特征,具Eu正异常和Ce负异常特征。Tb/Ca-Tb/La、Y/Ho-La/Ho及La/Yb-∑REE等图解表明小洞子萤石矿床主要为同一体系不同阶段的热液产物,破碎带充填交代型矿床成因,其成矿物质来源与灯影组地层和峨眉山玄武岩热液有关。
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| 关 键 词： | 布拖小洞子萤石 稀土元素 地球化学特征 矿床成因 |
REE Geochemistry of the Xiaodongzi Fluorite Deposit in Butuo |
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| LUO Li-ping,TAN Hong-qi,HU Jun-liang,XIE Hai-feng,ZHANG Wei. REE Geochemistry of the Xiaodongzi Fluorite Deposit in Butuo[J]. Acta Geologica Sichuan, 2020, 40(1): 45-50 |
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| Authors: | LUO Li-ping TAN Hong-qi HU Jun-liang XIE Hai-feng ZHANG Wei |
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| Affiliation: | (Institute of Comprehensive Utilization of Mineral Resources,CAGS,Chengdu 610041;College of Earth Sciences,Chengdu University of Technology,Chengdu 610059;Geochemical Exploration Team,SBGEEMR,Deyang,Sichuan 618000) |
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| Abstract: | The Xiaodongzi Pb-Zn-fluorite deposit in Butuo is confined to the Dengying Formation and controlled by the secondary fracture of the Sikai-Jiaojihe fault. The fluorite orebodies occur in banded chert-bearing dolomitite. REE geochemistry for the fluorite is characterized by enrichment in LREE with ΣLREE/ΣHREE of 0.96~1.61,(La/Yb)_N of 1.19~2.23 and positive Eu anomaly and negative Ce anomaly. The diagrams of Tb/Ca-Tb/La, Y/Ho-La/Ho and La/Yb-ΣREE show that ore fluids of the Xiaodongzi fluorite deposit were derived from different stage of the same hydrothermal system. The ore material was derived from the Dengying Formation and hydrothermal solution related to the Emeishan basalt. |
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| Keywords: | fluorite deposit REE geochemistry Xiaodongzi,Butuo |
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