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尕林格大型矽卡岩型铁多金属矿床位于东昆仑祁漫塔格盆山结合带中部,是祁漫塔格斑岩-矽卡岩成矿带内代表性矿床之一。因其地处盆地覆盖区、缺乏直接定年对象,一直未开展成矿年龄精细测定,制约了矿床成因和形成地球动力学过程的深入认识。本文采用40 Ar-39 Ar测年技术,获得尕林格矿区Ⅱ矿群磁铁矿矿石中金云母的40 Ar-39 Ar坪年龄为(235.8±1.7)Ma,等时线年龄为(234.1±3.7)Ma,反等时线年龄为(234.2±3.5)Ma。3组年龄数据在误差范围内完全一致,样品的坪年龄可以很好地代表尕林格矿床成矿年龄。结合区域成矿年龄数据表明,祁漫塔格成矿带在三叠纪存在大规模成矿作用,与花岗质岩浆活动有密切的成因联系。祁漫塔格带内强烈的岩浆活动和成矿作用是对三叠纪后碰撞伸展构造环境的响应,形成了构造-岩浆-成矿三位一体的时空体系。
The Gaolinge large-sized skarn-type iron polymetallic deposit is located in the middle of the Qiman Tagam Basin combined belt in East Kunlun and is one of the representative deposits within the Qimantag porphyry-skarn metallogenic belt. Because it is located in the basin coverage area, the lack of direct dating objects, has not been carried out fine determination of mineralization age, restricted the genesis of the deposit and the formation of a deep understanding of the geodynamic process. In this paper, 40 Ar-39 Ar dating of magnetite ore from ores Group II in the Kalinge Mine is obtained with age of (235.8 ± 1.7) Ma and isochron age of (234.1 ± 3.7) Ma, the anti-isokinetic age was (234.2 ± 3.5) Ma. The age data of the three groups are completely consistent within the error range. The plateau age of the samples can well represent the mineralization age of the Gaaringer Deposit. According to the data of regional metallogenic age, it shows that there is a large-scale mineralization in the Qimantag metallogenic belt in the Triassic, which is closely related to the granitic magmatism. The intense magmatism and mineralization in the Qimantag Zone are the response to the Triassic post-collision extensional tectonic environment, forming the tectonic-magmatic-ore-forming ternary space-time system.