本文依据云贵地区布格重力异常资料,用压缩质面法计算了这里的花岗岩层和玄武岩层的厚度,给出了等厚度图。 全区地壳构造在纵向上具双层结构,花岗岩层厚度约是整个地壳厚度的五分之一;在纵向上,以云南小江断裂为界,分成东西两部分,东部地区地壳由东南向西北逐渐变厚;西部地区地 .壳构造十分复杂,总体上表现出其北部地壳较厚,南部较薄,地壳增厚带和地壳减薄带大致呈南北向相间排列。 并且指出欧亚、印度和太平洋三大板块的聚合是这里地壳变形的原因。最后还讨论了建立本 ‘区重力地壳构造模式的计算误差问题。 Based on the Bouguer gravity anomaly data in Yungui area, the thickness of the granite and basaltic layers is calculated by the compressive-mass-plane method, and the contour map is given. The crustal structure in the region has a double-layered structure in the longitudinal direction. The thickness of the granite layer is about one-fifth of the thickness of the entire crust. In the longitudinal direction, the crust is divided into east and west parts by the Xiaojiang fault in Yunnan Province. The crust in the eastern part of the crust gradually increases from southeast to northwest Thickening. In the western region, the crust structure is very complicated, showing generally that its northern crust is thicker and its southern part is thinner. The crustal thickening belt and the crustal thinning belt are roughly arranged in the north-south direction. It also points out that the convergence of the three major plates in Eurasia, India and the Pacific Ocean is the reason for the crustal deformation here. Finally, the calculation error of establishing the gravity crustal tectonic model in this area is also discussed.