东昆仑东段杏树沟金矿(化)点的成矿特征及其围岩时代的确定  

A preliminary study of the Xingshugou gold mineralization spots in the eastern segment of Kunlun orogenic belt and the dating of its surrounding rocks

作　　者：时超[1] 李荣社[1] 何世平[1] 于浦生[1] 王超[1] 潘术娟[2] 张海迪[1] 

机构地区：[1]中国地质调查局西安地质矿产研究所,陕西西安710054 [2]中煤航测遥感局,陕西西安710054

出　　处：《地质通报》2012年第12期1983-1990,共8页Geological Bulletin of China

基　　金：中国地质调查局地质调查项目<秦-祁-昆重要结合带组成;成因及演化研究>(编号:1212011121258)

摘　　要：东昆仑成矿带是中国西部重大成(找)矿潜力的贵金属-有色金属成矿带。对东昆仑东段都兰县诺木洪南部产于下石炭统哈拉郭勒组(C1h)中的杏树沟金矿(化)点进行了初步研究,认为该金矿(化)点受近东西向韧脆性剪切构造的控制,矿化带内中酸性脉岩发育,与构造蚀变岩型金矿有相似的特征,可以与东昆仑其它金矿对比,具有一定的成矿潜力。含矿围岩为一套火山碎屑岩-碎屑岩建造,矿化蚀变主要为褐铁矿化、孔雀石化和黄铁矿化。在围岩的灰岩夹层中发现大量珊瑚、腕足和腹足类化石,其中Siphonodendron asiatica Yabe et Hayasaka和Siphonodendron asiatica minor Minato这2种珊瑚化石是首次在哈拉郭勒组发现,这不仅丰富了哈拉郭勒组的化石组合类型,而且将杏树沟金矿(化)点的围岩时代进一步限定为早石炭世维宪期。The Eastem Kunlun metallogenic belt is a preeious metal-nonferrous metal ore-fomaing belt with great prospecting potential in western China. Some gold mineralization spots in Early Carboniferous Halaguole Formation were preliminarily studied during the investigation of Nomhon Township in Dulan County, which hes in the eastern segment of KUnlun orogenic belt. And it is thus believed that gold mineralization was affected by the EW-trending ductile shearing, with the development of acid dykes in these min- eralization spots. These mineralization spots are similar to altered rock type gold deposits. The gold mineralization spots have some ore-forming potential because they are comparable with other ore deposits（spots） in eastern Kunhin metallogenic belt. The mineralization consists mainly of limonitization, pyritization and malachitization, with the surrounding rocks being pyroclastic rocks and clastic rocks. Fossils of corals, brachiopods and gastropod were found in the limestone interbed of the surrounding rocks in Halaguole Formation, and two coral fossils, i.e., Siphonodendron asiatica Yabe et Hayasaka and Siphonodendron asiatica minor Minato, were found for the first time in this formation. The discoveries not only enrich the fossil types of Halaguole Formation but also further restrict the age of the surrounding rocks of gold mineralization spots to Early Carboniferous.

关 键 词：东昆仑东段 构造蚀变岩型金矿 围岩时代 找矿前景 

分 类 号：P618.51[天文地球—矿床学] P597.3[天文地球—地质学]