沉积物预算估算器(SBE):一个用于随机估算海底通道系统沉积物通量和预算的过程模型。

IF 2 4区 地球科学 Q1 GEOLOGY
J. Eggenhuisen, M. Tilston, C. Stevenson, S. Hubbard, M. Cartigny, M. Heijnen, Jan de Leeuw, F. Pohl, Yvonne T. Spychala
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引用次数: 1

摘要

浊流通过海底通道将大量沉积物运送到深海盆地底部扇上。目前还缺乏定量的工具来重建这些系统的泥沙收支。本文的目的是建立一个简单且用户友好的模型,该模型可以根据可观测的海底通道尺寸和感兴趣系统的一般特征来估计浊流结构和沉积物收支。对该模型的要求是根据沉积物体积建模的源到汇视角的精神来定义的:一个简单的定量模型,反映自然变化,可以应用于具有稀疏数据可用性的古代系统。该模型使用输入条件来参数化浊度流的速度和浓度分布的分析公式。利用河道横截面和浊流活动的时间停顿来估计泥沙通量和泥沙收支。地质沉积物收支估计的固有不确定性激发了随机方法,这导致了沉积物收支估计的直方图,而不是离散值。用小规模实验浊度流和1929年大浅滩浊度流对模型进行了验证。该模型在可接受的误差范围内对地球上可能的最小和最大浑浊流的沉积物通量进行预测。最后,将该模型用于重建与白垩纪斜坡-河道沉积(智利Tres Pasos组)相关的沉积物收支。这些结果让我们深入了解了形成这些沉积物的白垩纪浊度流的可能的高度分层浓度剖面和流速。它们还能估算出河道活动时通过河道的典型泥沙量。根据对可观测的矿床几何形状与形成它们的流动规模之间关系的地质解释,这些体积变化很大。最后,预测泥沙收支的概率密度函数的形状取决于地质(不)确定性范围。因此,深海沉积物的正确地质解释对于深海系统沉积物收支的量化是必不可少的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Sediment Budget Estimator (SBE): a process-model for the stochastic estimation of fluxes and budgets of sediment through submarine channel systems.
Turbidity currents transport vast amounts of sediment through submarine channels onto deep-marine basin-floor fans. There is a lack of quantitative tools for the reconstruction of the sediment budget of these systems. The aim of this paper is to construct a simple and user-friendly model that can estimate turbidity-current structure and sediment budget based on observable submarine-channel dimensions and general characteristics of the system of interest. The requirements for the model were defined in the spirit of the source-to-sink perspective of sediment volume modeling: a simple, quantitative model that reflects natural variability and can be applied to ancient systems with sparse data availability. The model uses the input conditions to parameterize analytical formulations for the velocity and concentration profiles of turbidity currents. Channel cross section and temporal punctuation of turbidity-current activity in the channel are used to estimate sediment flux and sediment budget. The inherent uncertainties of geological sediment-budget estimates motivate a stochastic approach, which results in histograms of sediment-budget estimations, rather than discrete values. The model is validated against small-scale experimental turbidity currents and the 1929 Grand Banks turbidity current. The model performs within acceptable margins of error for sediment-flux predictions at these smallest and largest scales of turbidity currents possible on Earth. Finally, the model is applied to reconstruct the sediment budget related to Cretaceous slope-channel deposits (Tres Pasos Formation, Chile). The results give insight into the likely highly stratified concentration profile and the flow velocity of the Cretaceous turbidity currents that formed the deposits. They also yield estimates of the typical volume of sediment transported through the channels while they were active. These volumes are demonstrated to vary greatly depending on the geologic interpretation of the relation between observable deposit geometries and the dimensions of the flows that formed them. Finally, the shape of the probability density functions of predicted sediment budgets is shown to depend on the geological (un)certainty ranges. Correct geological interpretations of deep marine deposits are therefore indispensable for quantifications of sediment budgets in deep marine systems.
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来源期刊
CiteScore
3.80
自引率
5.00%
发文量
50
审稿时长
3 months
期刊介绍: The journal is broad and international in scope and welcomes contributions that further the fundamental understanding of sedimentary processes, the origin of sedimentary deposits, the workings of sedimentary systems, and the records of earth history contained within sedimentary rocks.
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