湖南临湘荆竹大山金矿地质特征及成因分析

The Geological Characteristics and Genetic Analysis of Jingzhudashan Gold Deposit in Linxiang County, Hunan Province

荆竹大山金矿位于湖南省临湘市北部,属于湘东北金矿矿集区。矿区处于扬子地台褶皱区的南部,新华夏系北东向沙湖-湘阴深切断裂的东侧,临湘山字型弧形构造的中心部位,区内构造复杂,有利于成矿。出露元古界冷家溪群地层,岩性较单一,岩浆岩不发育。通过对金矿床的地质特征、矿石矿物组成、成矿条件等进行系统的研究表明,该矿床受断裂构造的控制,沿断裂带局部充填石英脉,并出现硅化、绢云母化、黄铁矿化等矿化蚀变。该金矿成因类型应属于中低温热液裂隙充填型,工业类型为蚀变破碎岩型金矿和石英脉型金矿,其中蚀变破碎岩型金矿是区内的主要金矿类型。

Jingzhudashan gold deposit is located in the north of Linxiang City, Hunan Province, belongs to the Northeast Hunan gold ore district. Mining area is in the southern region of the Yangtze platform folds, in the East of NE New Neocathaysian system to the Shahu-Xiangyin deep fault, and in the central part of Linxiang mountain-shaped curved structure. Besides, complex structure in the region is conducive to mineralization.Exposed Proterozoic LENGJIAXI group stratum, lithology is single, magmatic rocks are not developed. The geological characteristics of gold deposit, ore minerals, ore-forming conditions system research shows, the deposit is controlled by faults, the local quartz vein filling along the fracture zone, accompanied by silicification,sericitization, pyritization and other mineralization and alteration. Genetic types of gold deposit belongs to the medium low temperature hydrothermal fissure filling type, industry type is altered fracture rock type gold deposit and quartz vein type gold deposit, which altered fracture rock type gold deposit is the main types of gold deposit zone.