Invemar
Bulletin of Marine and Coastal Research

RECENT BENTHONIC FORAMINIFERA IN DEEP-SEA SEDIMENTS OF THE PANAMA BASIN (COLOMBIAN PACIFIC), AS INDICATORS OF PRODUCTIVITY AND OXYGENATION

Maria Julliet Betancur, Ignacio Martínez

Abstract


Thirteen deep-sea samples (core-tops) from the Panama Basin, Colombian Pacific, were analysed for benthonic foraminifera in the >150μm size fraction. Based on the microfaunal content, three zones are recognised in the Panama Basin: (1) northern euphrophic region (~8º to 5,5ºN), characterized by a high concentration of organic matter flux to the seafloor, oxygenated sediments, and influence of the Panama Bight and the Costa Rica Dome upwelling systems, (2) mesotrophic region (~5,5 to 2ºN), characterized by low fluxes of organic carbon to the seafloor, oxygenated sediments, terrigenous influence and fluctuations of the upwelling systems of the basin, and (3) southern euphotic region (south of ~2ºN), characterized by a larger organic carbon flux to the seafloor, low oxygen content (disoxia) and influence of the Equatorial Divergence.

Keywords


Benthonic foraminifera; Eastern Equatorial Pacific; Panama Basin; Deep-sea sediments;Micropaleontology; Oxygenation

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DOI: 10.25268/bimc.invemar.2003.32.0.262

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