Submarine fans deposited in structurally complex settings record important information on basin evolution and tectonic–sedimentary relationships but are often poorly preserved in outcrops due to syndepositional and post depositional deformation. This study aims to understand the influence of tectonics on the deposition of the synorogenic Pennsylvanian lower Atoka submarine fan system deposited in a structurally complex foreland basin during the Ouachita orogeny. This study is a synthesis of new outcrop stratigraphic data as well as published stratigraphic and structural data. The lower Atoka crops out in the Ouachita Mountains and the southern Arkoma Basin and is divided into three structural–depositional zones: the foredeep, the wedge top, and the continental foreland. The mean paleoflow is axial, and each zone exhibits unique patterns in facies distribution. The foredeep consists of two fan systems, a large westward-prograding fan that exhibits significant longitudinal and lateral facies changes, and a small eastward-prograding fan on the western part. The wedge top consists of a westward-prograding fan that exhibits subtle longitudinal facies change. The continental foreland consists of small slope fan systems along the northern and western margins. By comparing to basin morphology and structural styles, we interpret the facies distribution patterns in the three zones as the result of different combinations of lateral structural confinement, axial and lateral sediment supply, and paleogeography. This study provides an improved and comprehensive understanding of the lower Atoka deepwater system and has implications for deciphering the tectonic–sedimentary relationships in laterally confined submarine fan systems.

中文翻译：

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前陆盆地环境中承压深水系统的构造-沉积相互作用：宾夕法尼亚州下阿托卡组，瓦希托山脉，美国

沉积在结构复杂环境中的海底扇记录了有关盆地演化和构造-沉积关系的重要信息，但由于同沉积和沉积后变形，在露头中往往保存不佳。本研究旨在了解构造对 Ouachita 造山运动期间沉积在结构复杂的前陆盆地中的同源宾夕法尼亚下阿托卡海底扇系统沉积的影响。本研究综合了新的露头地层数据以及已发表的地层和构造数据。阿托卡下游位于瓦希塔山脉和阿科马盆地南部，分为三个构造沉积区：前渊、楔形顶部和大陆前陆。平均古流是轴向的，每个区域在相分布上表现出独特的模式。前渊由两个扇系统组成，一个是大西进扇，纵横向变化显着，西进一个小东进扇。楔形顶部由一个西进扇组成，呈现出细微的纵向相变化。大陆前陆由沿北部和西部边缘的小型斜坡扇系统组成。通过对比盆地形态和构造样式，我们解释了三个带的相分布模式是侧向构造限制、轴向和侧向沉积物供应以及古地理的不同组合的结果。