河北下营坊金矿床特征及成矿规律

Geological characteristics and metallogenic regulity of the Xiayingfang gold deposit,Hebei

下营坊金矿床是下营坊多金属矿田内最主要的矿床之一,矿床就位受下金宝沟太古宙穹隆构造影响。金矿体产于下金宝沟花岗斑岩体内部以及岩体围岩中,受构造断裂带控制明显。金矿体成群成带侧列式分布,矿石以浸染状及细脉状为主,围岩蚀变主要为硅化和绢云母化。矿床成因为与中生代早期燕山陆内造山运动构造岩浆作用有关的岩浆热液型金矿。

The Xiayingfang gold depost is one of most important gold deposits in the Xiayingfang polymetallic ore field. The deposit formation was controlled by the Arehean Xiajinbaogou dome structure. The ore bodies are distributed in both Xiajinbaogou porphylitic intrusive and its wallrocks, obviously controlled by fractures and faults. Gold bodies occur in clusters or along strips. The gold ore is generally disseminated or veinlet-like. Wallrock alterations are predominantly sericitization and silicification. The deposit genesis is magmatic hydrothermal type which is associated to the Yansbanian intracontinental orogenesis and magmatism of Mesozoic age.