关键词: 桂西, 构造演化, 沉积型铝土矿, 二叠纪

Abstract: Western Guangxi, one of the most important source of bauxite ore deposit in China, is located in the Youjiang Basin, which is on the Yangtze Block of the South China Plate. In order to figure out the response of sedimentary bauxite to tectonic evolution from Late Paleozoic to Early Mesozoic in this area and to study about the influence on the ore forming process of bauxite deposit, the structure information that recorded by the bauxite ore deposit and the stratigraphic lithology in surrounding areas was analyzed from the perspective of ore geological characteristics and stratigraphy. The results show that the mineralization and transformation of sedimentary bauxite ore in western Guangxi is accompanied by regional tectonic movements. It provides favorable conditions for mineralization of bauxite ore deposit by crustal uplift and volcanic eruptions during the Dongwu Movement. Under the tectonic background settings of intracontinental deformation and compression during the Indosinian and Yanshanian movement in the South China Plate, the sedimentary bauxite was transformed, manifested as the shape changing and the spatial displacement of ore bodies.

Key words: western Guangxi, tectonic evolution, sedimentary bauxite, Permian