Flexural isostatic response of continental-scale deltas to climatically driven sea level changes

IF 2.8 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL Earth Surface Dynamics Pub Date : 2024-02-01 DOI:10.5194/esurf-12-301-2024
Sara Polanco, Mike Blum, Tristan Salles, Bruce C. Frederick, Rebecca Farrington, Xuesong Ding, Ben Mather, Claire Mallard, Louis Moresi
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Abstract

Abstract. The interplay between climate-forced sea level change, erosional and depositional processes, and flexural isostasy in deep time on passive margin deltas remains poorly understood. We performed a series of conceptual simulations to investigate flexural isostatic responses to high-frequency fluctuations in water and sediment load associated with climatically driven sea level changes. We model a large drainage basin that discharges to a continental margin and produces a large deltaic depocenter, then prescribe synthetic and climatic-driven sea level curves of different frequencies to assess flexural response. Results show that flexural isostatic responses are bidirectional over 100–1000 kyr timescales and are in sync with the magnitude, frequency, and direction of sea level fluctuations and that isostatic adjustments play an important role in driving along-strike and cross-shelf river mouth migration and sediment accumulation. Our findings demonstrate that climate-forced sea level changes produce a feedback mechanism that results in self-sustaining creation of accommodation into which sediment is deposited and plays a major role in delta morphology and stratigraphic architecture.
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大陆尺度三角洲对气候驱动的海平面变化的挠曲等静力响应
摘要人们对被动边缘三角洲的气候驱动海平面变化、侵蚀和沉积过程以及深时挠曲等静力之间的相互作用仍然知之甚少。我们进行了一系列概念模拟,以研究挠曲等静压对与气候驱动的海平面变化相关的水和沉积物负荷高频波动的响应。我们模拟了一个向大陆边缘排水并产生大型三角洲沉积中心的大型排水流域,然后设定了不同频率的合成海平面曲线和气候驱动的海平面曲线,以评估挠曲响应。结果表明,在 100-1000 千年的时间尺度上,挠曲等静力响应是双向的,与海平面波动的幅度、频率和方向是同步的,等静力调整在驱动沿岸和跨大陆架河口迁移和沉积物堆积方面发挥了重要作用。我们的研究结果表明,由气候引起的海平面变化产生了一种反馈机制,导致沉积物沉积的自持性容积的形成,并在三角洲形态和地层结构中发挥了重要作用。
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来源期刊
Earth Surface Dynamics
Earth Surface Dynamics GEOGRAPHY, PHYSICALGEOSCIENCES, MULTIDISCI-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
5.40
自引率
5.90%
发文量
56
审稿时长
20 weeks
期刊介绍: Earth Surface Dynamics (ESurf) is an international scientific journal dedicated to the publication and discussion of high-quality research on the physical, chemical, and biological processes shaping Earth''s surface and their interactions on all scales.
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