湖南上堡矿区钨锡矿成矿条件及找矿前景分析

W-Sn Mineralization Characteristics and Exploration Potential of the Shangbao Mineral District,Hunan Province

上堡矿区出露地层有石炭系和二叠系,壶天群及栖霞组的灰岩、白云质灰岩化学性质活泼,W、Sn含量较高;区内的燕山早期黑云母花岗岩呈岩株或岩枝状产出,岩石具钠长石化和云英岩化,微量元素丰度值高;花岗岩体顶面的洼部构造很发育,规模大,是有利的成矿空间;围岩蚀变强烈,以矽卡岩化为主;W、Sn等元素的土壤异常围绕岩体分布,并且强度大,范围广;经钻探揭露,在接触带上有具工业意义的矽卡岩型钨锡矿体。通过分析,认为上堡矿区成矿地质条件优越,具有大型规模钨锡矿找矿潜力。

In the Shangbao mining area the outcropping rocks are mainly Carboniferous and Permian limestone and dolomitic limestone of Hutian Group and Qiqia Formation with high W, Sn background ; the igneous rocks in the area are dominated by Jurassic biotite granite stocks or apophyses with albitization and greisenization, enriched in trace elements. Large scale top depression structures of the granite bodies are well developed , which provide the favorable spaces for the mineralization ; The skarn are widely developed along the contact and the high intensity soil geochemical anomalies of W and Sn are also distributed surrounding the intrusive bodies. The drilling has intersected the economic grade tungsten - tin mineralization in the contact zone. It is believed that the Shangbao mining area has favorable setting for hosting large scale W and Sn mineralization, and has good exploration potential.