准噶尔盆地南缘中段构造的平衡剖面研究

笔者以平衡剖面理论为指导,利用平衡剖面反演技术,研究了准噶尔盆地南缘中段3条代表性剖面构造的几何学、运动学与发育史。研究表明准噶尔盆地南缘中段山前冲断带构造变形强度由北到南整体表现为由弱变强,反冲断层位移逐渐增大、反冲断层所滑脱的层位亦逐渐加深。纵向上划分为基底卷入型褶皱—冲断带和滑脱型褶皱—冲断带;在横向上不同构造带之间通过相邻构造的变形样式和滑脱层位的渐变实现位移的传递、转换和互补,从而保持褶皱—逆冲断层累计缩短量沿走向有规律的渐变关系。

A Study of the Balanced Sections of the Structure in the Central Part of Southern Junggar Basin

Based on the theory of balanced section, the author probed into structural geometry, kinematics and structural history of three typical sections in the study area by using the inversion technique of balanced section. It is shown that the fold-thrust zone in the central part of southern Junggar Basin can be longitudinally divided into two parts, namely the basement-involved belt and the décollement belt. The structure has the characteristics that displacement of the back thrust increases and its detached horizon deepens gradually from north to south. In the latitudinal direction, the conversion of regional shortening strain is changed regularly during the compressional deformation through the transfer and complementarity of the displacement.