Geological characteristics and prospecting direction of tin polymetallic deposit in Tangjiawan, Chahe, Huili County, Sichuan Province
四川会理县岔河唐家湾锡多金属矿床地质特征与找矿方向

摘要

四川会理县岔河唐家湾锡多金属矿床位于扬子地台西缘康滇地轴中段，是攀西地区重要的锡多金属矿产地之一。本文通过野外地质调查、室内岩矿鉴定等方法对该矿床的地质特征及找矿方向做出全面探索。结果表明，矿床赋存于中元古界会理群天宝山组浅变质碎屑岩-碳酸盐岩建造中，受北东向断裂构造控制明显，矿化类型主要为锡石-硫化物型，矿石矿物以锡石、黄铁矿、闪锌矿、方铅矿为主，脉石矿物主要为石英、方解石。结合区域成矿规律及矿床地质特征，认为矿床成因类型为中低温热液充填交代型。找矿方向应重点关注北东向断裂带及其旁侧次级断裂、地层有利岩性组合部位以及地球化学异常浓集中心，为该区后续找矿工作提供了科学依据。

Abstract

The Tangjiawan Tin Polymetallic Deposit in Chahexian, Huili County, Sichuan Province, is located in the middle section of the Kangdian geosyncline along the western margin of the Yangtze Platform, representing one of the key tin polymetallic ore deposits in the Panxi region. This study comprehensively investigates the geological characteristics and exploration directions of the deposit through field geological surveys and laboratory analyses of rock and mineral samples.
Results indicate that the deposit is hosted in the shallow metamorphic clastic-carbonate strata of the Tianbaoshan Formation within the Huili Group of the Middle Proterozoic, with significant control from northeast-trending fault structures. The mineralization type is predominantly stibnite-sulfide, with ore minerals including stibnite, pyrite, sphalerite, and galena, while gangue minerals mainly consist of quartz and calcite. Based on regional metallogenic patterns and geological features, the deposit is classified as a medium-low temperature hydrothermal filling alteration-type. Exploration priorities should focus on northeast-trending fault zones, adjacent secondary faults, favorable lithologic assemblages in strata, and geochemical anomaly concentration centers, providing scientific guidance for future mineral exploration efforts in the area.