The sedimentary feature and structure significance of turbidite Carboniferous Permian on the northwestern margin of the Tarim Basin

Aim To evaluate the sedimentary feature and structure significance of turbidite of top of Upper Carboniferous-bottom of Middle Permian on the northwestern.Methods Make analysis of turbidite lithologic,facies and the feature of time-space variation of late period of Late Carboniferous-early period of Middle Permian.Results It indicates that from late period of Late Carboniferous-early period of Early Permian to early period of Middle Permian,the sedimentary area of turbidite was decreased remarkably,and it removed to southwest,at the same time,the water got deeper.Conclusion The feature of sedimentary-structure shows that the structure activity in interior of south Tianshan Mountain belt is intensely,and the sedimentary-structure framework of turbidite is owing to the overthrust of south Tianshan Mountain to the Tarim block.This study reflects that the south Tianshan Mountain belt of Late Carboniferous-early period of Middle Permian is in late period of collision orogens.