Biogeochemical changes within the Benguela Current upwelling system during the Matuyama diatom maximum; nitrogen isotope evidence from Ocean Drilling Program sites 1082 and 1084

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doi: 10.1029/2001PA000659
Author(s): Robinson, Rebecca S.; Meyers, Philip A.
Author Affiliation(s): Primary:
University of Michigan, Department of Geological Sciences, Ann Arbor, MI, United States
Volume Title: Paleoceanography
Source: Paleoceanography, 17(4), 10p. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0883-8305 CODEN: POCGEP
Note: In English. 42 refs.; illus.
Summary: The Matuyama Diatom Maximum (MDM) is a time of peak opal accumulation from 2.6 to 2.0 Ma within the Benguela Current upwelling system that was initiated by increased influence of Southern Ocean water on the eastern South Atlantic. This study measured opal, total organic carbon (TOC), and CaCO3 fluxes and C and N stable isotopes in sediments deposited from 2.4 to 1.95 Ma at Sites 1082 and 1084 to explore the biogeochemical dynamics within the Benguela region. The infusion of Southern Ocean water delivered dissolved nutrients and Southern Ocean flora and fauna. The bulk sediment 15N records are taken to reflect changes in the 15N of nitrate in the incoming water, where lower values at 2.4 Ma reflect less nitrate utilization in the Antarctic. (modified journ. abst.)
Year of Publication: 2002
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Atlantic Ocean; Benguela Current; Biogenic processes; Cenozoic; Diatoms; Framework silicates; Geochemistry; Hydrochemistry; Isotope ratios; Isotopes; Leg 175; Matuyama Chron; Microfossils; N-15/N-14; Neogene; Nitrogen; ODP Site 1082; ODP Site 1084; Ocean Drilling Program; Opal; Organic compounds; Paleo-oceanography; Paleocirculation; Paleocurrents; Plantae; Pliocene; Sea water; Silica minerals; Silicates; South Atlantic; Southern Ocean; Stable isotopes; Tertiary; Total organic carbon; Upper Cenozoic
Coordinates: S210539 S210539 E0114914 E0114914
S253049 S253049 E0130140 E0130140
Record ID: 2003069537
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