吉林省永吉县头道沟硫铁矿床地质特征及其成因

Geological features and genesis of the Toudaogou pyrite deposit in Yongji County,Jilin Province

本文对永吉县头道沟硫铁矿床地质特征进行总结以讨论其成因。研究表明,矿床可分为两种矿石类型的矿体,一种为硫铁矿体,受古生界呼兰岩群头道沟岩组斜长角闪岩控制;另一种为磁铁矿+辉钼矿体,受中侏罗世超基性岩与头道沟岩组斜长角闪岩之间的矽卡岩接触带控制。结合区域构造演化史认为,头道沟硫铁矿床为复合成因矿床,早古生代弧盆系演化阶段形成海相火山岩型硫铁矿,中侏罗世超基性岩浆侵入形成矽卡岩型磁铁矿+辉钼矿体。

The geological features of Toudaogou pyrite deposit in Yongji County are summarized to discuss its genesis.The study shows that the deposit can be divided into two types of ore bodies,one is pyrite body,which is controlled by the plagioclase amphibolite of the Tougaogou Formation of the Hulan Rock Group of Paleozoic;The other is magnetite+molybdenite,which is controlled by the skarn contact zone between the ultrabasic rocks of the Middle Jurassic and the plagioclase amphibolite of the Toudaogou Formation.Combined with the regional tectonic evolution history,it is believed that the Toudaogou sulfur iron deposit is a composite genesis deposit.During the early Paleozoic arc basin evolution stage,marine volcanic rock type sulfur iron deposits were formed.In the Middle Jurassic,ultrabasic magma intrusion formed skarn type magnetite+molybdenite ore bodies.