德国波茨坦大学Maria Mutti团队研究了红海亚喀巴湾碳酸盐-硅质碎屑综合沉积输移系统。相关论文于2025年3月27日发表在《地质学》杂志上。

源到汇研究通常假设硅质碎屑和碳酸盐具有独立的沉积路径系统。研究组整合了卫星衍生的地形、图像、条带多波束测深和现场观测，以表征红海北部亚喀巴湾从源到汇的混合碳酸盐-硅质碎屑路由系统。研究区域两旁是季节性的沙漠溪流（干涸河床），在山洪暴发期间，这些溪流将沉积物脉冲输送到陆架和盆地。

研究组发现，在海岸的干涸河道分流处，它们沉积了与连续的边缘礁、狭窄的大陆架和没有主要海底峡谷或扇的平滑线形斜坡系统相关的混合扇三角洲。当裂点迁移到海岸线或活跃的干涸河道时，边缘礁被凹状物（沙洲）一分为二，没有大陆架，斜坡由崎岖的峡谷和山脊组成。沙洲的发育是陆架上溯源裂点迁移侵蚀和差异沉积建造的净效应。

与陆架切割峡谷相连的海底扇通常比与斜坡限制峡谷相关的海底扇大。扇的大小与附属河道网络的集水区密切相关，连接着陆源和海相沉积系统。该研究为研究产生陡峭、狭窄、混合碳酸盐-硅质碎屑边缘的陆源、海岸、陆架、斜坡和盆地耦合过程提供了一个窗口。该研究结果建立在传统沉积模型的基础上，并证明了碳酸盐和硅质碎屑沉积物综合路由系统之间的反馈，特别是在干旱气候下。

附：英文原文

Title: Integrated carbonate-siliciclastic sediment-routing systems in the Gulf of Aqaba, Red Sea

Author: Ben Rendall, Sam J. Purkis, Wafaa Altyeb, Maria Mutti

Issue&Volume: 2025-03-27

Abstract: Source-to-sink studies commonly assume independent sediment routing systems for siliciclastics and carbonates. This study integrates satellite-derived topography, imagery, swath multibeam bathymetry, and field observations to characterize a mixed carbonate-siliciclastic routing system from source to sink in the Gulf of Aqaba, northern Red Sea. The study area is lined by ephemeral desert streams (wadis) that deliver pulses of sediment to the shelf and basin during flash floods. We find that where wadis are distributary at the coast, they deposit amalgamated fan deltas associated with a continuous fringing reef, a narrow continental shelf, and a smooth line-fed slope system devoid of major submarine canyons or fans. Where knickpoints have migrated to the shoreline or into active wadi channels, the fringing reef is bisected by reentrants (sharms), there is no continental shelf, and the slope is composed of a rugged assortment of canyons and ridges. Development of sharms is the net effect of erosion by headward knickpoint migration and construction by differential aggradation on the shelf. Submarine fans linked to shelf-incising canyons are generally larger than those associated with slope-confined canyons. Fan size strongly correlates with the catchment area of the affiliated wadi networks, linking terrigenous and marine sedimentary systems. Our study offers a window into coupled terrigenous, coastal, shelf, slope, and basinal processes that have produced a steep, narrow, mixed carbonate-siliciclastic margin. The findings presented herein build on traditional depositional models and demonstrate feedbacks between integrated carbonate and siliciclastic sediment routing systems, especially in an arid climate.

DOI: 10.1130/G52925.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G52925.1/653318/Integrated-carbonate-siliciclastic-sedimentredirectedFrom=fulltext