南天山独山锡矿床的成矿特征及成矿模式

MINERALIZATION CHARACTERISTICS AND METALLOGENETIC MODEL OF DUSHAN SN DEPOSIT IN THE EASTERN PART OF THE SOUTH TIANSHAN MOUNTAIN

通过对渗沙水锡矿点宏、微观研究，否定了原矽卡岩型锡矿的成因观点，提出锡矿化与早二叠世末碱长花岗岩侵入和热液充填交代有关，矿化受断裂破碎构造控制。以此新观点为指导，我们在南天山东段首次发现了与早二叠世末钾长花岗斑岩有关的成型锡矿床——独山锡矿床。从蚀变、矿期活动及矿石中锡的存在形式等方面对该矿床进行了详细研究，确定了该矿床的形成包括锡石-泥晶碳酸盐充填交代、锡石-石英-铁矿物充填及锡石-石英-硫化物充填3个成矿阶段。根据稳定同位素、稀土特征对矿床成因进行了探讨，并建立了矿床成矿模式。

Based on micro and macro-scopic researches, the pre-existing hypothesis that the genesis of Shenshashui Sn deposit belongs to skarn-type is denied. It is proposed that the Sn mineralizations are linked to the intrusion of the early Permian alkali granite and filling of thermal solutions, and are also controlled by faults and fracture zones. Directed by this new viewpoint, we discovered the Dushan Sn deposit which is related to early Permian K-feldspar granite porphyry in the eastern part of the south Tianshan Mountain for the first time. Though detailed researches have been done on alterations, activities of metallogenic period and existing forms of Sn in ores,three metallogenic stages of the deposit have been determined, namely cassiterite-and carbonate metasomatism-filling stage, cassiterite-quartz-iron minerals filling stage, and cassiterite-quartz - sulfides filling stage. According to the features of stable isotopes and rare earth elements, the genesis of the deposit is discussed and the metallogenic model for the deposit is established.