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

Leonardo Tamborrino, Claudia Wienberg, Juergen Titschack, Paul Wintersteller, Furu Mienis, Andrea Schroeder-Ritzrau, Andre Freiwald, Covadonga Orejas, Wolf-Christian Dullo, Julia Haberkern and Dierk Hebbeln
Mid-Holocene extinction of cold-water corals on the Namibian Self steered by the Benguela oxygen minimum zone
Geology (Boulder) (October 2019) 47 (12): 1185-1188

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.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 47
Serial Issue: 12
Title: Mid-Holocene extinction of cold-water corals on the Namibian Self steered by the Benguela oxygen minimum zone
Affiliation: University of Bremen, MARUM-Center for Marine Environmental Sciences, Bremen, Germany
Pages: 1185-1188
Published: 20191015
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 31
Accession Number: 2019-095281
Categories: Quaternary geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2019401
Illustration Description: illus. incl. sketch map
S20°45'00" - S20°34'60", E12°41'60" - E12°52'00"
Secondary Affiliation: Royal Netherlands Institute for Sea Research, NLD, NetherlandsHeidelberg University, DEU, GermanySenckenberg am Meer, DEU, GermanyInstituto Espanol de Oceanografia, ESP, SpainGEOMAR-Helmholtz Centre for Ocean Research, DEU, Germany
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201950
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