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Geology; January 2000; v. 28; no. 1; p. 23-26; DOI: 10.1130/0091-7613(2000)28<23:MACCIA>2.0.CO;2
© 2000 Geological Society of America
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Manganese and color cycles in Arctic Ocean sediments constrain Pleistocene chronology

Martin Jakobsson1, Reidar Løvlie2, Hakam Al-Hanbali1, Eve Arnold1, Jan Backman1 and Magnus Mörth1

1 Department of Geology and Geochemistry, Stockholm University, S-106 91 Stockholm, Sweden
2 Institute of Solid Earth Physics, Allégatan 41, N-5007, Bergen, Norway

Sequential variations in manganese (Mn) content and color of deep-sea sediments retrieved from the Lomonosov Ridge (87°N) in the central Arctic Ocean apparently mimic low-latitude {delta}18O glacial-interglacial cyclicity, thereby providing stratigraphic information that together with biostratigraphic data permit the construction of a detailed chronological model. Correlation of this Mn and color chronology to established apparent Brunhes-age estimates of geomagnetic excursions reveals a remarkable fit between these two independently derived time scales. The Mn and color cycles probably provide paleoenvironmental information about material fluxes in the Arctic Ocean over the past 1 m.y. We suggest that the primary source for the observed manganese variations in our sediment core is northern Siberia, which has extensive peat bogs and boreal forests. These Siberian source areas could operate in an off and on mode tuned to Pleistocene glacial and interglacial periods. Contrasts in ventilation of Arctic Ocean waters during interglacial-glacial cycles probably could also enhance the observed Mn and color variability.

Key Words: Arctic Ocean • chronology • manganese • cyclicity • sediments • color




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