青海尕林格矽卡岩型铁矿金云母~(40)Ar/~(39)Ar年代学及成矿地质意义
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摘要
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 Qiman Tagh metallogenic belt is one of the most important porphyry-skarn mineralization areas in China,which lies in the west of the East Kunlun orogenic belt.The Galinge deposit is one of the largest skarn iron polymetallic deposits in this belt.In this study,the ore-forming age is performed on the phlogopite using 40 Ar-39 Ar dating method,which yielded an isochron age of 234.1±3.7Ma,an inverse isochron age of 234.2±3.5Ma,and a plateau age of 235.8±1.7Ma.These three age data are highly consistent within error.Therefore,the plateau age can represent the mineralization time.The result from this study,as well as the previously reported data,indicates a large-scale Middle-Triassic mineralization in the Qiman Tagh metallogenic belt, which is closely related to the Middle-Triassic granodioritic magmatism,and can be explained as a response to the regional post-collisional extension.
The Qiman Tagh metallogenic belt is one of the most important porphyry-skarn mineralization areas in China,which lies in the west of the East Kunlun orogenic belt.The Galinge deposit is one of the largest skarn iron polymetallic deposits in this belt.In this study,the ore-forming age is performed on the phlogopite using 40 Ar-39 Ar dating method,which yielded an isochron age of 234.1±3.7Ma,an inverse isochron age of 234.2±3.5Ma,and a plateau age of 235.8±1.7Ma.These three age data are highly consistent within error.Therefore,the plateau age can represent the mineralization time.The result from this study,as well as the previously reported data,indicates a large-scale Middle-Triassic mineralization in the Qiman Tagh metallogenic belt, which is closely related to the Middle-Triassic granodioritic magmatism,and can be explained as a response to the regional post-collisional extension.
引文
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