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西天山阿吾拉勒成矿带广泛发育的大哈拉军山组火山岩为以一套流纹岩、粗面岩、粗面安山岩、中酸性凝灰岩和少量玄武岩为主体的火山岩-沉积岩建造。本研究运用LA-ICP-MS锆石U-Pb法,厘定了松湖铁矿、式可布台铁矿、备战铁矿火山岩的成岩时代,并系统整理阿吾拉勒铁矿成矿带上已经获得的高精度年代学数据,确定阿吾拉勒成矿带大哈拉军山组火山岩的时间分布规律为自西向东渐变的特征,在年代上表现为自西向东呈由老变新的趋势,早石炭世火山岩从西向东表现为尖灭的特征,在岩性上具有安山岩-玄武安山岩-粗面质火山熔岩-火山碎屑岩变化的特点。在此基础上,结合遥感影像特征,确定大哈拉军山组火山岩的空间分布特征,进一步提取破火山口的特征,判断其与典型矿床之间的位置关系,探讨典型矿床与火山机构在成因上的联系,结合大地构造演化特征,探讨其地质意义。
The Dahalajunshan Formation volcanic rocks, widely developed in the Uwalale metallogenic belt of the western Tianshan, are constructed of volcanic-sedimentary rocks that are mainly composed of a series of rhyolite, trachyte, andesite, medium-acid tuff and a few basalts. In this study, LA-ICP-MS zircon U-Pb method was used to determine the diagenetic age of the Songhu iron ore deposit and the Type Kebutai iron ore iron ore volcanic rock. The ore-forming belt of the Awulalar iron ore deposit Obtained from the high-precision geochronology data to determine the time distribution of the volcanic rocks of the Dahalajunshan Formation in the Ulalale metallogenic belt is characterized by a gradual change from west to east and from old to new from the west to east in the age, The Early Carboniferous volcanic rocks show the characteristics of pinch out from west to east, and have the characteristics of andesite - basaltic andesite - rough volcanic lava - volcaniclastic rock in lithology. On the basis of this, combined with the characteristics of remote sensing images, the spatial distribution characteristics of volcanic rocks in the Dahalajunshan Formation are determined, and the features of the caldera are further extracted to determine their relationship with the typical deposits. On the connection, combined with the tectonic evolution characteristics of the geology to explore its geological significance.