河北省丰宁银矿萤石特征及找矿意义

FLUORITE CHARACTERISTICS AND ITS ORE PROSPECTING SIGNIFICANCE IN THE FENGNING SILVER DEPOSIT,HEBEI PROVINCE

萤石是丰宁银矿最重要的标志性脉石矿物之一,对其产出的地质地球化学特征研究认为,银成矿与萤石具有极其相似的地球化学行为,空间上可密切伴生产出。紫色萤石于热液活动早期酸性介质中沉淀而成,距矿体最近;绿色、白色萤石在热液活动中—晚期于中性介质中沉淀而成,距矿体较远;无色萤石在热液活动晚期于碱性介质中析出,距离矿液活动中心最远。

Fluorite is one of the most important indicative gangue minerals in the Fengning silver deposit. Geologic and geochemical occurrences indicate that metallogenetie geochemical behaviours of silver and fluorite axe very similar, and these two minerals occurred intimately in space. Purple fluorites were deposited in acid environment of the early stage hydrothermal activity, and occurred nearest to ore bodies. Green and white fluorites were formed in neutral environment of middle to late stage hydrothermal activity, and lie a little far from ore bodies. Colourless fluorites were formed in alkaline environment of the late stage hydrothermal activity, and located farthest to the central part of hydrothermal activity.