重庆武隆木梯子-申基坪铝土矿床地质特征及成因

摘要

The Mutizi-Shenjiping bauxite deposit is belongs to the Nanchuan-Wulong bauxite metal-logenic belt,it is occurred in the permian liangshan formation.The Mutizi-Shenjiping bauxite deposit gen-esis is analyzed is discussed by analyzing the deposit geological characteristics,ore-controlling geological conditions and ore-forming material source.The analysis results show that the Mutizi-Shenjiping bauxite deposit is controlled by the geological conditions such as strata,structure,lithofaciespaleogeographic,pal-eotopography,sedimentary environment,paleoclimate,ancient tectonic conditions and so on,the metallo-genic material is derived from the base of the ancient weathering crust formed by the weathering of silurian silty shale.Combing with the geological background and deposit geological characteristics,it can be in-ferred that the Mutizi-Shenjiping bauxite deposit is mainly experienced three metallogenic phases,they are laterization phase,sedimentation phase and supergene leaching phase,the Mutizi-Shenjiping bauxite de-posit is belongs to the ancient weathering crust and sedimentary-transformedtype deposit.%重庆武隆木梯子—申基坪铝土矿床属于南川—武隆铝土矿成矿带，赋存于二叠系梁山组地层中。分析了该矿床地质特征、控矿地质条件及成矿物质来源并详细探讨了矿床成因，结果表明：该矿床受地层、构造、岩相古地理、古地形、沉积环境、古气候、古构造条件的控制，成矿物质来源于志留系基底粉砂质页岩形成的古风化壳。结合成矿地质背景及矿床地质特征，认为木梯子—申基坪铝土矿床的形成过程大致经历了红土化作用阶段、沉积再沉积作用阶段和表生淋滤作用阶段，属于古风化壳沉积-改造型矿床。