一、引言天山地槽褶皱系与天山山脉的范围大致相当,西延与苏联天山及哈萨克斯坦南部相接 (图1),东经北山地区进入蒙古。在我国境内,有三条主要构造线将天山地槽褶皱系分为四个次级大地构造单元:北天山华力西优地槽褶皱带、南天山华力西冒地槽褶皱带、天山中间隆起带及北山华力西断褶带(以下分别简称北天山、南天山、中天山及北山)。 I. INTRODUCTION The Tianshan Gully Fold System is roughly equivalent to the Tianshan Range. The West Extension connects with the Soviet Tianshan Mountains and the southern part of Kazakhstan (Figure 1) and enters the Mongolia through the North Mountain area. In China, there are three main tectonic lines that divide the Tianshan earth-fluvial fold series into four sub-tectonic units: the North Tianshan Variscan gneiss fold belt, the southern Tianshan Variscan gabbro fold belt, the Tianshan uplift Belt and Beishan Warisi fault fold belt (hereinafter referred to as North Tianshan, South Tianshan, Middle Tianshan and Beishan).