阿克塔斯金矿地质特征及找矿前景

新疆富蕴阿克塔斯金矿(化)体,产于石英二长岩体与北塔山组中酸性火山-沉积建造的接触带。受NE-SW向压扭性断裂所控制,矿化体呈脉状,分枝复脉状,金矿化极不均匀,主要为自然金,裂隙金和晶隙金。矿石具浸染状,角砾状构造,半自形粒状结构,与黄铁矿化和钠化蚀变关系密切,分两个成矿期,四个成矿阶段,早期均-温度334℃,中期260-270℃,成矿压力约为170×10~5Pa,Lgfo_2在-47.1～36.7范围,属热液型脉状矿床,有潜在的找矿前景。

GEOLOGICAL FEATURES AND PROSPECT OF AKETASI GOLD DEPOSIT, XINJIANG

Aketasi deposit, Fuyun county, Xinjiang, is located in Kalatongke are of south margin of Variscan Siberia continent plate. The deposit is occured in contact zone of quartz monzonite and felsic volcanic strata of Beitashan formation of middle Devonian, The ore body is directly occured multiple quartz veins of exocontact zone and intrusion margin of inner contact zone controlled by tectonic fracture alteration zone trending NE-SW and EW. The mineralization is not well-distributed, the ore body are as vein with small size. The alteration near the ore body is middle-high temperature hydrothermal alteration association belonging to mesothermal deposit. The ore forming fluid is weak acid solution with lower salinity and lower dense dominated by magmatic water and a littlr meteoric water. Theerafore, the genetic type belongs to mesothermal lode deposits. After its discovering the deposit has been studied synthetically to extend the area of mineralization. It is considered that the tectonic fracture zones in west, southwest, east and south of the district are the prospect areas being worth the futher geological prospecting.