Stratigraphy of bottom sediments in the Mendeleev Ridge area (Arctic Ocean)

Two age models are available for bottom sediments cored in the Arctic Ocean: older [15] and younger [69]. The first of them assuming very low sedimentation rates is based on interpretation of the magnetization vector in sediments and finds of partic ular stratigraphically significant microfossils (i...

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Bibliographic Details
Published in:Doklady earth sciences 2013-06, Vol.450 (2), p.602-606
Main Authors: Gusev, E. A., Maksimov, F. E., Kuznetsov, V. Yu, Basov, V. A., Novikhina, E. S., Kupriyanova, N. V., Levchenko, S. B., Zherebtsov, I. E.
Format: Article
Language:English
Subjects:
Amino acids
Bottom sediments
Earth and Environmental Science
Earth Sciences
Geology
Magnetization
Microfossils
Oceans
Oxygen isotopes
Sedimentation rates
Sediments
Sediments (Geology)
Stratigraphy
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Summary:Two age models are available for bottom sediments cored in the Arctic Ocean: older [15] and younger [69]. The first of them assuming very low sedimentation rates is based on interpretation of the magnetization vector in sediments and finds of partic ular stratigraphically significant microfossils (index species and assemblages). The replacement of the pos itive residual magnetization in sedimentary sections by the negative one, which was correlated with the boundary between the Brunhes and Matuayma paleo magnetic epochs, was considered as the main criterion for developing the older model [3]. The second model assuming higher sedimentation rates is based on amino acid dates obtained for tests of planktonic foraminifers, optically stimulated luminescence dates obtained for quartz and feldspar grains, climatostrati graphic interpretations of oxygen isotope curves, con tents of ice rafted material, and Fe and Mn minerals in sediments. In this model, older foraminifers and diatoms are considered as being reworked and inter vals with reversed magnetization of sediments are cor related with episodes of the Brunhes, not Matuyama, epoch. Detailed analysis of sediment cores obtained recently throughout the entire Arctic Ocean has stim ulated most researchers to accept the younger model.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X13060111