上一个冰川周期末期中生代碳酸盐平台输出的变化(西印度洋萨亚德马勒哈滩)

IF 1.9 3区 地球科学 Q1 GEOLOGY
Or M. Bialik, Christian Betzler, Juan Carlos Braga, John J. G. Reijmer, Jesus Reolid, Sebastian Lindhorst
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引用次数: 0

摘要

从碳酸盐岩平台顶部输出海蚀物质是建造平台斜坡的关键过程。然而,我们对平台材料供应模式的了解主要是基于目前海平面高位期间位于透光带的平台。这种观点有些偏颇,因为从地质年代来看,并非所有的平台都处于透光带。马斯卡林海台的 Saya de Malha Bank 就是一个现代中生碳酸盐平台的例子,因此,它的泛滥和输出模式与欣快区的不同。利用在萨亚德马勒哈滩西坡采集的岩芯,研究了该平台自上一个冰川大期以来的输出模式。平台边缘的物质通过多种可能的过程被绞碎并运往斜坡。平台上的物质是高镁方解石和低镁方解石以及高锶文石和低锶文石的组合,综合了浮游生物和海相生物的来源。这些成分的比例随着时间的推移而变化,平台的生产能力也随着全新世大潮期间被淹没和淹没而变化。来自平台的物质主要在低海拔时期以封闭流和非封闭流的形式输送,前者主要发生在全新世大断裂晚期和高海拔早期。在目前的高地状态下,供应可能已经减少,导致峡谷肩部受到侵蚀。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Changes in mesophotic carbonate-platform export across the end of the last glacial cycle (Saya de Malha Bank, western Indian Ocean)

Changes in mesophotic carbonate-platform export across the end of the last glacial cycle (Saya de Malha Bank, western Indian Ocean)

The export of neritic material from the top of carbonate platforms is a key process in the construction of their slopes. However, our knowledge of the supply pattern of materials from platforms is dominantly based on platforms lying in the euphotic zone during the present sea-level highstand. This is a somewhat biased perspective as through geological time not all platforms were euphotic. The Saya de Malha Bank in the Mascarene Plateau is an example of a modern mesophotic carbonate platform, and as such, its flooding and export patterns differ from those of euphotic ones. Using cores collected on the western slope of the Saya de Malha Bank, the export patterns of the platform since the last glacial maximum were explored. Material on the platform edge is winnowed and transported to the slope by multiple possible processes. The material on the platform is a combination of high and low magnesium calcite as well as high and low strontium aragonite, integrating pelagic and neritic sources. The ratio of these constituents varies over time with changes in the platform production capability as it was flooded and drowned during the Holocene transgression. The material from the platform is transported in both confined flows, mainly during lowstands, and unconfined flows, mainly during late transgression and early highstand. In the present state of the highstand, supply may have diminished, leading to erosion of the canyon shoulders.

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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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