Abstract This paper focuses on the Neogene–Quaternary tectonic evolution of the Lake Van Basin at the located in the Turkish -Iranian Plateau. To better understand the complex tectonic history of the region and determine the paleostress patterns, we investigate and report on the geometric, structural, and kinematic characteristics of the Basin based on field observations of fault-slip orientations which are classified according to radiometric ages of the basin stratigraphy. The analysis of large-scale structures and fault kinematics indicate that three different deformation phases prevailed in the Lake Van Basin during the Neogene-Quaternary period. Phase 1 is characterized by NW-SE extension and NE-SW contraction that gave rise to the development of strike-slip faults with thrust or normalcomponents in lateMiocene, deforming the fluvial sediments which expose at east/northeast of the Basin. Phase 2 is characterized in fluvial and lake deposits of the Middle Pleistocene, deformed by dominant contractionstress regime effective along NW-SE direction. The latePleistocene tectonic regime (Phase 3) consists of transpressional deformation that develops under NNW-SSE compression and ENE-WSW extension. According to our analysis, the present-day deformation pattern of the Lake Van Basin is dominated by compression at east, while at the northern part is transtensional.

中文翻译：

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从 Van 湖盆地（东安纳托利亚）断层运动学分析评估上新-第四纪构造应力状态

摘要 本文重点研究位于土耳其-伊朗高原的范湖盆地新近纪-第四纪构造演化。为了更好地了解该地区复杂的构造历史并确定古应力模式，我们基于对断层滑动方向的实地观测，调查并报告了该盆地的几何、构造和运动学特征，这些断层滑动方向根据该地区的辐射年龄分类。盆地地层学。大尺度构造和断层运动学分析表明，新近纪—第四纪范湖盆地主要存在三个不同的变形阶段。第一阶段的特征是 NW-SE 伸展和 NE-SW 收缩，导致在晚中新世发育具有逆冲或正常成分的走滑断层，使盆地东部/东北部暴露的河流沉积物变形。第 2 阶段的特征是中更新世的河流和湖泊沉积物，由沿 NW-SE 方向有效的主导收缩应力机制变形。晚更新世构造体系（第 3 阶段）由在 NNW-SSE 压缩和 ENE-WSW 伸展下发展的挤压变形组成。根据我们的分析，范湖盆地现今的变形格局东侧以压缩为主，北侧以横张为主。晚更新世构造体系（第 3 阶段）由在 NNW-SSE 压缩和 ENE-WSW 伸展下发展的挤压变形组成。根据我们的分析，范湖盆地现今的变形格局东侧以压缩为主，北侧以横张为主。晚更新世构造体系（第 3 阶段）由在 NNW-SSE 压缩和 ENE-WSW 伸展下发展的挤压变形组成。根据我们的分析，范湖盆地现今的变形格局东侧以压缩为主，北侧以横张为主。