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

Author:

Bialik Or M.12ORCID,Betzler Christian3,Braga Juan Carlos4,Reijmer John J. G.5ORCID,Reolid Jesus4,Lindhorst Sebastian3

Affiliation:

1. Institute of Geology and Palaeontology University of Münster Münster Germany

2. Dr. Moses Strauss Department of Marine Geosciences, The Leon H. Charney School of Marine Sciences University of Haifa Carmel Israel

3. Institut für Geologie, Universität Hamburg Hamburg Germany

4. El Departamento de Estatigrafía y Paleontología, Facultad de Ciencias, Avenida de la Fuente Nueva Granada Spain

5. Department of Geosciences, Faculty of Science Vrije Universiteit Amsterdam Amsterdam The Netherlands

Abstract

AbstractThe 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.

Funder

Ministerio de Ciencia e Innovación

Bundesministerium für Bildung und Forschung

Publisher

Wiley

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