【摘要】 西藏冈底斯成矿带是位于雅鲁藏布江结合带与班公湖—怒江结合带之间的世界级巨型铜多金属成矿带。冈底斯成矿带中铅锌矿床主要有夕卡岩型(接触交代夕卡岩型和层控夕卡岩型)和充填热液脉型2类,矿床的形成与岩浆活动关系密切,成矿时代分为中生代燕山晚期((157.41±1.20)Ma)、新生代喜山早期(65～40Ma)和喜山晚期(25～10Ma)等3期。其中,喜山早期为夕卡岩型铅锌矿床最重要的成矿期,喜山晚期为充填热液脉型铅锌矿床的主成矿期。赋矿地层主要为晚古生代石炭-二叠系,其次为中生代侏罗系—白垩系。矿床具有呈EW向带状、SN向串状分布的特征,在局部构造单元内矿床呈丛聚性分布规律。重要的地质事件控制着矿床的形成,是2期或多期地质事件联合作用的结果。层控夕卡岩型铅锌矿是冈底斯成矿带的重要矿化类型之一,往往由热水沉积作用、多期构造改造及岩浆热液活动相互叠加富集而成。更多还原

【Abstract】 The Pb-Zn deposits located in Gangdise metallogenic belt can be classified into the skarn type(contact metasomatism skarn type and strata bound skarn type) and the hydrothermal vein type.Late Yanshan period of Mesozoic(157.41±1.20) Ma),Early Himalayan period(65-40 Ma)and Late Himalayan period(25-10 Ma) of Cenozoic are the main metallogenic epochs.The skarn type of Pb-Zn deposits are mainly formed in the Early Himalayan period,the hydrothermal vein type in Late Himalayan period.Late Palaeozoic Carboniferous-Permian system is the main ore-bearing strata then the strata of Mesozoic Jurassic-Cretaceous system.The deposits occur in EW belt and SN string and cluster in local geological structural unit.Formation of the Pb-Zn deposits is controlled by important geological events and is the product of combination of two or more of these geological events.The strata bound skarn lead-zinc deposit is one of the main mineralization in Gangdise metallogenic belt and is formed by inter-superimposition of tectonic reworkings and magmatic-hydrothermal activities on the hot-water sedimentary mineralization.更多还原