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首页> 外文期刊>Journal of Asian earth sciences >Structural characteristic and origin of intra-continental fold belt in the eastern Sichuan basin, South China Block
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Structural characteristic and origin of intra-continental fold belt in the eastern Sichuan basin, South China Block

机译：华南地块川东盆地陆内褶皱带的构造特征与成因

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The fold-and-thrust belt in the eastern Sichuan basin is represented by a series of subparallel chevron anticlines. Under the orogenic tectonic setting within the South China Block in Meso-Cenozoic period and the influence of the multi-layer detachment fault, the deformation of the thrust belt exhibits remarkably layered and large-scale intracontinental thrusting structural characteristics. In this paper, we focus on the structural geometry and deformational mechanisms using the latest two-dimensional (2D) and three-dimensional (3D) seismic reflection data in combination with well and outcrop data. The multi-layer detachment faults, especially the upper gypsum-bearing detachment in the Middle Triassic Jialingjiang Formation and lower detachment with gypsum or shale in the Lower-Middle Cambrian system, directly control the deformational styles of the study area. Interpretation of seismic sections indicates that the fold-and-thrust belt has various deformational styles during folding, including fault-propagation fold, fault-bend fold, and detachment fold with box-fold or pop-up structural geometry. Regional location and structural boundaries play significant roles in controlling the deformational styles, and distinct differences exist among the different anticlines. The Huayingshan anticline located at the front of the thrust belt shows intense structural deformation with northwestward thrusting direction and a relatively weak opposite southeastward thrusting. In addition, the anticlines exhibit structural differences along strike and the fold-and-thrust belt in the northern segment is influenced by the North China Block. (c) 2015 Elsevier Ltd. All rights reserved.
机译：川东盆地的褶皱冲断带以一系列平行的人字形背斜为代表。在中新生代华南地块内的造山构造背景下，在多层脱离断层的影响下，逆冲带的变形表现出明显的分层和大规模的陆内逆冲构造特征。在本文中，我们重点研究结构几何和变形机制，结合最新的二维（2D）和三维（3D）地震反射数据以及井和露头数据。多层脱层断层，特别是中三叠统嘉陵江组的上含石膏脱层和下中寒武统的含石膏或页岩的下脱层，直接控制了研究区的变形样式。对地震剖面的解释表明，褶皱冲断带在褶皱过程中具有多种变形形式，包括断层传播褶皱，断层弯曲褶皱和具有箱形或弹出结构几何形状的分离褶皱。区域位置和结构边界在控制变形样式中起着重要作用，并且不同背斜之间存在明显差异。位于逆冲带前部的华ying山背斜表现出强烈的构造变形，其逆冲方向为西北，而逆冲方向相对较弱。此外，背斜在走动上表现出结构上的差异，而在华北地块的影响下，北部的褶皱冲断带受到影响。 （c）2015 Elsevier Ltd.保留所有权利。

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