西班牙埃斯卡尼利亚地层河道中的排水量和沉积通量间歇性:地层结构变化的影响

IF 1.9 3区 地球科学 Q1 GEOLOGY
Nikhil Sharma, Alexander C. Whittaker, Thierry Adatte, Sébastien Castelltort
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引用次数: 0

摘要

排水量和泥沙通量变化是控制河流形态动力学行为的重要参数。尽管对现代河流的排水量和泥沙通量变化的定量估算已经非常精确,但从岩石记录中对古代河流系统的流量和泥沙通量间歇性的评估却少得多。本研究探讨了西班牙中始新世埃斯卡尼利亚地层中的排水量、沉积通量变异性与河道地层结构变化模式之间的关系。水排量间歇因子(IWF)是以(平均时间段内的)总水排量与同一时间段内瞬时成槽水排量之比计算得出的,在高混杂区间为 0.03 至 0.11,在低混杂区间为 0.10 至 0.32。同样,沉积通量间歇因子(ISF)估计在高混和区间为 0.008 至 0.01,在低混和区间为 0.01 至 0.03。因此,高汞齐化区间很可能是在间歇性更强、持续时间更短的强降水事件下沉积的,而低汞齐化区间则是全年间歇性较小的水流的结果。总体而言,这些估算值与典型的干旱至半干旱气候下的现代短时河流的估算值一致,也与所研究冲积系统的中始新世气候背景的现有代用数据一致。这凸显了水文气候、河流形态动力学和地貌演化之间的重要联系,对预测地质过去地球表面的河流流量和沉积物运移具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Water discharge and sediment flux intermittency in the fluvial Escanilla Formation, Spain: Implications for changes in stratigraphic architecture

Water discharge and sediment flux intermittency in the fluvial Escanilla Formation, Spain: Implications for changes in stratigraphic architecture

Water discharge and sediment flux variations are important parameters controlling the morphodynamic behaviour of rivers. Although quantitative estimates for water discharge and sediment flux variability are well-constrained for modern rivers, far fewer assessments of flow and sediment flux intermittency in ancient fluvial systems from the rock record are available. In this study, a relationship between water discharge, sediment flux variability and patterns of changing fluvial stratigraphic architecture in the Middle Eocene Escanilla Formation, Spain, is explored. Water discharge intermittency factor (IWF), calculated as a ratio of the total water discharge (over the averaging time period) to the instantaneous channel-forming water discharge if sustained for the same period, ranges from 0.03 to 0.11 in the high amalgamation intervals and from 0.10 to 0.32 in the low amalgamation intervals. Similarly, the sediment flux intermittency factor (ISF) is estimated to be in the range of 0.008 to 0.01 in the high amalgamation intervals and of 0.01 to 0.03 in the low amalgamation intervals. Consequently, high amalgamation intervals were most probably deposited under more intermittent and short-lived intense precipitation events while low amalgamation intervals were the result of less intermittent flows spread throughout the year. Overall, these estimates are consistent with values from modern ephemeral rivers typically found in arid to semi-arid climate and is in agreement with available proxy data for the Middle Eocene climatic context of the studied alluvial system. This highlights an important connection between hydroclimate, river morphodynamics and landscape evolution, and has implications to predict river flow and sediment transport across the Earth's surface in the geological past.

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来源期刊
CiteScore
4.10
自引率
16.70%
发文量
42
审稿时长
16 weeks
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