青海大柴旦镇尕日力根砾岩型金矿成矿特征研究

位于青海大柴旦镇境内的尕日力根金矿床是青海境内发现的砾岩型金矿床。其矿体主要赋存在下-中二叠统勒门沟组砾岩夹薄层砂岩中,矿体主要呈似层状、透镜状,且受地层控制明显;金主要富集在含矿砾岩的胶结物中,重砂实验中发现了原始砂金。矿区还发育辉锑矿脉、含金黄铁矿脉,石英中流体包裹体低盐度(4.01%~10.74%)、中低温(169.8~256.3℃)的特征均暗示研究区可能存在后期热液的扰动。该矿床成矿可划分为沉积成矿阶段和热液成矿阶段,其属于沉积成矿和热液叠加成矿复合成因。

Metallogenic characteristics of the Gariligen conglomerate type gold deposit in Dachaidan Town, Qinghai Province

The Gariligen gold deposit located in Dachaidan Town,Qinghai Province,is the first conglomerate gold deposit discovered in Qinghai Province. The orebodies of the Gariligen deposit are mainly hosted in conglomerate alternating with thin sandstone of the Early-Middle Permian Lemengou Formation,and controlled by strata. The ore bodies assume stratoid and lenticular forms. Gold mineralization is mostly concentrated in the cement of the ore-forming conglomerate. The original placer gold was found in the heavymineral analysis of this deposit. The stibnite veins and auriferous pyrite veins developed in the mining area,and the fluid inclusions in quartz veins with low salinity( 4.01% ~ 10.74%),middle-low temperature( 169.8 ~ 256.3℃) suggested this deposit was affected by late hydrothermal disturbance. The mineralization of the deposit can be divided into sedimentary stage and hydrothermal stage. It belongs to the composite metallogenesis of sedimentary mineralization and hydrothermal superimposition.