摘要
中国西部经向构造体系可划分六个构造带,以4°—5°间距贯穿全区,并向两端延伸,应属全球经向构造体系的组成部分。笔者依据最新地质及地球物理资料,论述了他们的分布特征及其成因机制,并指出它们在地壳演化和寻找有用矿产方面的意义。
The Meridonal structural zones in western China have been rarely repor- ted,despite their wide distribution. They may be divided into six zones: a)Sichuan-Yunnan—East Qinghai lake zone; b)West Yunnan—West Qinghai lake zone; c)East Tibet—West Gansu zone; d)Central Tibet—East Xinjiang zone; e)Mt.Jolmolungma—Mt.Friendship zone; f)West Tibet—West Xinjiang zone. These zones are characterized by:(a)Presence of large superposed folds and basement faults;(b)Complex mechanical properties,often with the compressive,tensile and shear structural features present in the same stru- ctural zone;(c)A long development and repeated activity,having suffered an E-W compression during the decline of the Latitudinal structural zone; (d)Awider development in central Asia beyond the limits of the western China,and a long,discontinued northward or southward extension. The meridional structural zones in western China are parts of those of the whole earth.They may originate from a change of the rate of the Earth's rotation.
出处
《地质力学学报》
CSCD
1989年第1期85-97,共13页
Journal of Geomechanics
