扎格罗斯褶皱冲断带构造变形特征  

Structure-deformation features of the Zagros fold and thrust belt

作　　者：文磊[1] 张光亚[2] 李曰俊[1] 温志新[2] 张强[1] 赵岩[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国石油勘探开发研究院,北京100083

出　　处：《地质科学》2015年第2期653-664,共12页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家科技重大专项课题"全球重点大区石油地质特征与油气分布规律"(编号:2011ZX05028-003)资助

摘　　要：扎格罗斯褶皱冲断带是扎格罗斯碰撞造山带的前陆褶皱冲断带,也是波斯湾周缘前陆盆地的楔顶带,自北东到南西垂直于构造线方向可分为高扎格罗斯冲断带和扎格罗斯简单褶皱带;自北西到南东沿构造线方向可分为洛雷斯坦区(Lorestan)、迪兹富勒湾区(Dezful Embayment)和法尔斯区(Fars)。扎格罗斯褶皱冲断带的形成始于晚白垩世阿拉伯板块的洋壳向北俯冲到欧亚板块之下,褶皱冲断构造从北东部缝合带向南西方向伸展,并在上新世基本定型。本文选取了横切扎格罗斯褶皱冲断带的3条地质剖面和两条局部地震剖面进行构造变形分析。剖面分析显示研究区垂向上由一条大滑脱面将扎格罗斯褶皱冲断带剖面分为上、下两个构造层;褶皱冲断变形从北东到南西向由强变弱。研究区发育走滑、挤压和拉张3种构造变形,挤压构造变形占主导地位。挤压构造变形又包括滑脱褶皱、断展褶皱、断弯褶皱和双重构造等。Zagros fold and thrust belt, as the foreland fold and thrust belt of Zagros collisional orogen, is the wedge-top zone of the Persian Gulf peripheral foreland basin. Zagros fold and thrust belt could be divided, along the NE to SW orientation, into high Zagros thrust belt and Zagros simply folded belt, and parallel to the belt orientation, it could be divided into Lorestan, Dezful Embayment and Fars. Zagros fold and thrust belt is formed, as begins in Late Cretaceous, by the Arabia oceanic crust subduct down into the Eurasian plate, and the fold- thrust formation developed from NE to SW until it comes into a steady situation basically in Pliocene. The paper analysed the structure-deformation features of three geology sections across the Zagros fold and thrust belt and two seismic profile of Zagros fold and thrust belt, and found the sections could be devided into two up- and down- structural stages by a long decollement layer, and the deformation gets weaker from NE to SW. The structural styles of Zagros fold and thrust belt are extensional, compressional and strike-slip, and the dominant styles is compressional（ include decollement fold, fault propagation fold, fault bend fold, klippe and duplex）.

关 键 词：扎格罗斯褶皱冲断带 高扎格罗斯冲断带 扎格罗斯简单褶皱带 构造变形样式 

分 类 号：P542[天文地球—构造地质学]