Existing fan-delta depositional models for lacustrine basins do not adequately address significant wave- and storm-related processes. However, in many lakes, such high-energy processes can be effectively driven by winds. As such, the prevailing wind direction determines the propagation direction of wind-induced waves. Observations from modern examples show that wave-dominated deposits commonly exist on one side of the lake, and their sedimentary processes are completely distinct from those on the opposite side. However, equivalent deposits have seldom been identified from subsurface data. We present an ancient example from the Upper Tongbomiao Formation in the Tanan Depression (Tamtsag Basin, Mongolia), which was previously interpreted as a fan-delta depositional system. Based on extensive core investigations, eighteen lithofacies, six lithofacies associations and two genetic deposition systems are identified, and a new sedimentological interpretation is proposed comprising a wave-dominated clastic littoral system in the western half-graben dip slope and a fluvial-dominated fan-delta system in the eastern half-graben. Sediments within the eastern half-graben unit include braidplain, fan-delta front and prodelta environments, while those within the western half-graben dip slope unit comprise dominantly alluvial fan, wave-reworked beach, storm-affected shoreface and offshore sediments. The strikes of the sediments in the western half-graben dip slope unit are parallel to the westward shoreline trend, while the progradation direction of sediments in the eastern half-graben unit is perpendicular to the eastern shoreline. This indicates approximately northwestward-propagating waves that were possibly driven by southeasterly winds, which has implications for understanding the prevailing wind direction in Northeast Asia during the depositional period. Other factors contributing to the preservation of these two distinct sedimentary systems are the paleotopography and subsequent climate shift towards more humid climatic conditions which intensified sediment supply and hydrodynamic conditions that were able to rework the sediments.

现有的湖盆盆地扇三角洲沉积模型不能充分解决与波浪和风暴有关的重大过程。但是，在许多湖泊中，这种高能量过程可以有效地由风驱动。这样，盛行的风向确定了风感应波的传播方向。从现代实例中观察到的结果表明，以波浪为主的沉积物通常存在于湖的一侧，其沉积过程与另一侧的沉积过程完全不同。但是，很少从地下数据中识别出等效的沉积物。我们提供了一个古老的例子，它来自塔南凹陷（蒙古塔姆察格盆地）的上通博庙组，以前被解释为扇三角洲沉积系统。根据广泛的核心研究，十八个岩相，确定了六个岩相协会和两个遗传沉积系统，并提出了一种新的沉积学解释，包括在西部半graben倾斜坡中的波浪控制的碎屑沿海系统和在东部半graben的河流控制的扇三角洲系统。东部半graben单元内的沉积物包括辫状平原，扇形三角洲前缘和三角洲环境，而西部半graben倾角斜坡单元内的沉积物则主要是冲积扇形，波浪整修的海滩，受风暴影响的岸面和近海沉积物。西部半深部陡坡单元的沉积物走向与西岸线趋势平行，东部半深部陡坡单元的沉积物沉积方向与东部海岸线垂直。这表明可能是由东南风驱动的大约向西北传播的波，这对了解沉积期间东北亚的主要风向具有重要意义。维护这两个不同沉积系统的其他因素是古地形学，以及随后的气候向更湿润的气候条件转变，这加剧了沉积物供应和能够修复沉积物的流体动力条件。