河南嵩县马石沟萤石矿床地质特征及元素地球化学特征研究

马石沟萤石矿床位于嵩县桑树沟萤石矿床东侧，为近年新发现的中型萤石矿床。为了探讨马石沟萤石矿床成因类型、成矿环境及后期找矿方向，本文对其地质特征、岩（矿）石元素地球化学特征进行分析研究。结果表明，马石沟萤石矿体主要赋存在合峪岩体内北西西向断裂构造带，矿体形态及分布严格受构造控制；主矿体深部均未封闭，找矿潜力大，建议加强主矿体（F2-I、F3-I、F4-I）深部勘查工作；矿石中CaF₂和SiO₂呈明显负相关特征，符合热液矿床特征；萤石具有轻稀土略显富集、轻重稀土发生一定分馏的特点，围岩具有轻稀土富集型、轻重稀土分馏程度较高的特点；萤石具有显著的Eu负异常和Ce正异常，均指示区内成矿作用发生在还原环境；萤石矿床Tb/Ca-Tb/La和Y/Ho-La/Ho图解显示，马石沟萤石矿床为岩浆热液成因矿床，成矿流体可能具有同源性。

Study on geological and element geochemical characteristics of the Mashigou fluorite deposit in Songxian County， Henan Province

The Mashigou fluorite deposit is located to the east of the Sangshugou fluorite deposit in Songxian County. It is a newly discovered medium-sized fluorite deposit. In order to discuss the genetic type， metallogenic environment and prospecting direction of the Mashigou fluorite deposit， the geological characteristics， geochemical characteristics of rock （ore） and stone elements are analyzed and studied. The results show that the Mashigou fluorite ore body mainly occurs in the NW-trending fault tectonic zone in Heyu rock mass， and the morphology and distribution of the ore body are strictly controlled by the structure. The deep exploration work of the main ore bodies （F2-I，F3-I，F4-I） should be strengthened. The negative correlation between CaF₂ and SiO₂ is obvious， which accords with the characteristics of hydrothermal deposit. Fluorite has the characteristics of light rare earth enrichment and light rare earth fractionation， and the surrounding rock has the characteristics of light rare earth enrichment and high degree of light rare earth fractionation. The fluorite has significant negative Eu anomaly and positive Ce anomaly， indicating that the mineralization occurred in the reducing environment. The Tb/Ca-Tb/La and Y/ HO-La /Ho diagrams of the fluorite deposit show that the Mashigou fluorite deposit is of magmatic hydrothermal origin， and the ore-forming fluid may have homology.