The formation of the Kelso Dunes in the eastern Mojave Desert, California, was a landscape-changing event triggered by an increase in sediment supply that followed the incision of Afton Canyon by the Mojave River ca. 25 ka. Eastward migration of sand dunes occurred along a well-defined eolian transport corridor. Dunes temporarily blocked washes resulting in substantial aggradation of eolian and fluvial sediments. Stratigraphic exposures reveal numerous fining-up sequences with interbedded eolian sands that provide evidence of dune dams and subsequent aggradation. Luminescence ages reveal that dune blocking and aggradation correspond to a regional pulse of alluvial fan sedimentation that occurred ca. 14–9 ka. Meanwhile, relative landscape stability occurred downstream of dune dams, resulting in the formation of a moderately developed soil on abandoned fluvial deposits. The next pulse of alluvial fan activity ca. 6–3 ka likely resulted in the breaching of the dune dams, followed by incision. Eolian system sediment state theory suggests that eolian activity in the Mojave Desert is closely tied to enhanced sediment supply, primarily related to the Mojave River–Lake Mojave system. Our data suggests that Intermittent Lake Mojave I, ca. 26–22 ka, triggered a large dune-building event that impounded massive amounts of sediment derived from alluvial fans deposited during the Pleistocene-Holocene transition. Breaching of dune dams and sediment recycling may have also increased sediment supply that contributed to late Holocene eolian activity. This profound impact on the regional geomorphology highlights the critical importance of eolian-fluvial interactions in desert environments.

中文翻译：

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风沙-河流相互作用和沙丘坝在景观变化中的作用，晚更新世-全新世，莫哈韦沙漠，美国

在加利福尼亚州莫哈韦沙漠东部，凯尔索沙丘的形成是景观变化的事件，其原因是加利福尼亚州莫哈韦河切入阿夫顿峡谷后，泥沙供应增加。25 ka。沙丘向东迁移发生在一个明确的风沙运输走廊上。沙丘会暂时阻止洗涤，导致风积和河流沉积物大量积聚。地层暴露表明，大量的层理风沙与层状风积砂层相交，为沙丘坝和随后的积聚提供了证据。发光年龄表明，沙丘阻塞和凝结对应于大约20年前发生的冲积扇沉积的区域脉动。14–9 ka。同时，相对景观的稳定性发生在沙坝的下游，导致在废弃河床沉积物上形成中等发育的土壤。下一个冲积扇活动脉冲。6–3 ka可能会导致沙丘水坝破裂，然后切开。风积系统的沉积状态理论表明，莫哈韦沙漠中的风积活动与增加的沉积物供应密切相关，主要与莫哈韦河-莫哈韦湖系统有关。我们的数据表明，间歇性莫哈韦湖I，ca。26-22 ka，引发了一个大型的沙丘建造事件，该事件积蓄了大量来自更新世-全新世过渡期间沉积的冲积扇的沉积物。突破沙丘大坝和沉积物回收也可能增加了沉积物供应，这导致了晚新世风积活动。