桂西地区二叠纪至白垩纪构造演化对沉积型铝土矿成矿的制约

桂西地区地处右江盆地，位于华南板块扬子陆块之上，是中国重要的铝土矿产地之一。为了探讨沉积型铝土矿对本地区晚古生代至早中生代的构造演化的响应，分析其对铝土矿成矿过程的影响，文章从矿床地质特征及地层学的角度，剖析了沉积型铝土矿赋矿地层及周边地区地层岩性记录的构造信息。结果显示，桂西沉积型铝土矿的成矿和改造过程始终受区域性构造运动影响：东吴运动时期的地壳抬升和剧烈的火山喷发活动为本地区沉积型铝土矿的成矿提供了有利的成矿条件和容矿场所；在华南板块印支期和燕山期的陆内变形和挤压作用的大地构造背景下，沉积型铝土矿受到改造，表现为矿体形态和空间位置上的变化。

Tectonic Evolution from Permian to Cretaceous in WesternGuangxi and Its Relation with Sedimentary Bauxite

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.