喜玛拉雅造山带内普遍发育垂直于造山带的伸展构造 .曲松、普兰、洛扎、聂拉木和亚东等地的研究表明它们代表平行于造山带的伸展 ,伸展形成的盆地内发育与伸展同期的垂直于造山带的挤压构造 ,伸展构造的形成时代为 16～ 13Ma ,与整个东南亚强烈挤压期一致 ,所以它们是造山期同收缩伸展 .伸展期的主导构造运动为挤压和隆升 ,伸展构造是造山带应变分解所致 ,而不是高原下降的标志 Himalayan orogenic belts generally develop extensional structures perpendicular to the orogenic belt.Quasong, Pulan, Loza, Nyalam and Yadong and other places of the study shows that they represent parallel to the extension or extension of the orogenic belt formed within the basin During the same period of development and extension, the tectonic movement of the extensional tectonism is 16-13 Ma, which is consistent with the intense crustal period of the entire Southeast Asia, so they are either contractible orogenic during the orogeny. Pressure and uplift, extension of the tectonic deformation caused by the orogenic belt rather than a sign of plateau decline