Mid-Holocene extinction of cold-water corals on the Namibian shelf steered by the Benguela oxygen minimum zone

Tamborrino, Leonardo, Wienberg, Claudia, Titschack, Jürgen, Wintersteller, Paul, Mienis, Furu, Schröder-Ritzrau, Andrea, Freiwald, André, Orejas, Covadonga, Dullo, Wolf-Christian, Haberkern, Julia and Hebbeln, Dierk (2019) Mid-Holocene extinction of cold-water corals on the Namibian shelf steered by the Benguela oxygen minimum zone Geology, 47 (12). pp. 1185-1188. DOI 10.1130/G46672.1.

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Abstract

An exceptionally large cold-water coral mound province (CMP) was recently discovered extending over 80 km along the Namibian shelf (offshore southwestern Africa) in water depths of 160-270 m. This hitherto unknown CMP comprises >2000 mounds with heights of up to 20 m and constitutes the largest CMP known from the southeastern Atlantic Ocean. Uranium-series dating revealed a short but intense pulse in mound formation during the early to mid-Holocene. Coral proliferation during this period was potentially supported by slightly enhanced dissolved oxygen concentrations compared to the present Benguela oxygen minimum zone (OMZ). The subsequent mid-Holocene strengthening of the Benguela Upwelling System and a simultaneous northward migration of the Angola-Benguela Front resulted in an intensification of the OMZ that caused the sudden local extinction of the Namibian corals and prevented their reoccurrence until today.

Document Type: Article
Keywords: acoustical methods, Africa, Anthozoa, Benguela, Current Cenozoic, Cnidaria, continental shelf, cores, dissolved oxygen, echo sounding, extinction, geophysical methods, geophysical surveys, Holocene, marine environment, marine sediments, middle Holocene, mounds, Namibia, oxygen, paleo-oceanography, paleotemperature, Quaternary, sediments, solutes, sonar methods, Southern Africa, surveys, upwelling
Research affiliation: MARUM
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
NIOZ
Refereed: Yes
DOI etc.: 10.1130/G46672.1
ISSN: 0091-7613
Projects: The Ocean Floor - Earth's Uncharted Interface
Expeditions/Models:
Date Deposited: 09 Jan 2020 12:22
Last Modified: 22 Jan 2020 12:48
URI: http://eprints.uni-kiel.de/id/eprint/48655

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