福建寿宁大安银金矿地质特征及找矿标志

Geologic Characteristics and Ore-hunting Indicators of the Daan Silver-gold Depoist in Shouning County,Fujian Provinc

寿宁大安银金矿主要产于晚侏罗世陆相沉积-火山喷发碎屑岩系中。矿体呈脉状、囊状等,受次级断裂构造控制,成矿在时空上与中生代中酸性火山、岩浆活动密切相关。根据矿石结构、构造、贮存状态以及围岩蚀变等特征,初步认为该矿床属于低温浅成火山热液脉状型。

The Daan silver-gold ores mainly exist in the Late Jurassic terrestrial deposit-volcanic clastic sequence. The orebodies act like the veiny and cryptomere, which is controlled by secondary faulted structures. The ore-forming process has a close relation with Mesozoic intermediate and acid volcanic-magmatic activity in space time. Based on the characteristics of the ore textures and structures, the storage conditions and the wall-rock alteration, it is considered that the mineral deposit belongs to the deposit of the low temperature hydrothermal volcanic hydrothermal vein type.