大营子蚀变岩型金矿床地质特征及控矿因素的研究

大营子蚀变岩型金矿主档是冀北地区新发现的一种金矿类型。矿体赋存于太古代角闪角变质岩系，特别是变质闪长岩体周边及内侧，受ＮＥ、ＮＮＥ向剪切破碎带控制，常在其傍侧断裂形成羽状矿脉。

GEOLOGICAL CHARACTERISTICS AND ORE CONTROL FACTORS OF THE DAYINGZI ALTERED ROCK TYPE GOLD DEPOSIT

The Dayingzi altered rock type gold deposit is a newly found gold deposit in the northern Hebei province.Ore bodies occur in Archaeozoic hornblende metamorphic rock series,especially in the surrounding area and inner side of the metamorphic diorite,controlled by NE and NNE shear zone,and occur as feather veins in the side faults.Gold minerals were formed at the late stage of forming major sulfides such as pyrite,chalcopyrite,galena and sphalerite,which can be indicated by potassium feldspar alteration,silication,pyritization and sericitization chloritization developed in the shear zone and country rocks,and regular distribution of the altered minerals. Discovery of the gold deposit is an important penetration in exploration for this type of gold deposit in the northern Hebei province,which play a positive promoting role for further geological prospecting and development of mining industry.