藏南措美-隆子多金属矿床成因探讨

矿床成因分析是找矿的基础工作。本文基于藏南措美-隆子一带金锑铅锌银多金属矿床的实地调查和室内分析结果,在揭示该成矿带上金锑铅锌银矿床的基本特征的基础上,初步认为该成矿带上的金、锑、铅、锌、银多金属矿床系燕山晚期-喜马拉雅早期构造-热事件,驱动地热系统流体循环形成的中低温热液脉状矿床,大气降水下渗与岩浆水混合构成地热水循环系统。流体包裹体具中低温和低盐度特征,马扎拉锑金矿床的氢、氧同位素和硫同位素测试分析显示有岩浆水参与,并且岩浆水在成矿过程中起了主导作用。受区域近南北向挤压和近东西向区域性大断裂的影响,成矿流体易于充填在其次级的走向近南北向、北西向、北东向的张性断裂中。

The genetic analysis of deposits is the basic work of prospecting.Based on the field survey and indoor analysis results of gold,antimony,lead,zinc and silver polymetallic deposit in the South Tibet Cuomei-Longzi zone,on the basis of revealing the basic characteristics of the gold,antimony,lead,zinc and silver deposits in this metal logenic belt,it is preliminarily believed that the gold,antimony,lead,zinc and silver polymetal licdeposits on this metallogenic belt are late Yanshan-early Himalaya structure-thermal event,and medium and low temperature hydrothermal vein deposits are formed by driving fluid circulation in geothermal system,and geothermal water circulation system is constructed by atmospheric precipitation infiltration mixing with magmatic water.Fluid inclusions has medium and low temperature and low salinity characteristics,the analysis of hydrogen,oxygen and sulfurisotopes in the Mazhala antimony gold deposit shows the presence of magmatic water and the magmatic water played a dominant role in the mineralization.Influenced by the near north-south extrusion and near east-west regional large fracture,the ore-forming fluids are easy to fill in the subprime direction of tensional fracture near north-south,north-west and north-east.