Sedimentogenesis in the Amundsen Basin from geophysical data and drilling results on the Lomonosov Ridge.

Chernykh, A. A. and Krylov, A. A. (2011) Sedimentogenesis in the Amundsen Basin from geophysical data and drilling results on the Lomonosov Ridge. Doklady Earth Sciences, 440 (2). pp. 1372-1376. DOI 10.1134/S1028334X11100011.

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Abstract

Studies in the Amundsen Basin have revealed six seismostratigraphic complexes (SSCs) in this region. The horizons bounding these complexes were dated by identifying the linear magnetic anomalies. The recognized SSCs are correlated with the seismostratigraphic and lithostratigraphic units of the Lomonosov Ridge. Based on these correlations, the lithological composition of SSCs in the Amundsen Basin is suggested. The formation of SSC2 is supposed to be due to the diagenetic processes associated with the transition of opal-A to opal-CT. It is found that, generally, the rate of sedimentation in the Amundsen Basin has consistently decreased since the beginning of its formation. However, in the Chattian time, the global regression resulted in a sharp increase in the rate of sedimentation in the basin. Arguments in favor of the duration of the Middle Cenozoic sedimentary hiatus on the Lomonosov Ridge reduced to 16.3 Ma are presented. It is supposed that the decrease in the intensity of oceanic crustal accretion in the Eurasian Basin, which is identified by the slowdown in the rate of its opening in the interval from 46 to 20–23 Ma might have resulted in a gradual sea level falling in the Arctic Ocean isolated from the World Ocean. This fact probably accounts for the Lomonosov Ridge having remained in subaerial conditions over the period from 36.7 to 20.4 Ma.

Document Type: Article
Keywords: Sedimentogenesis; Amundsen Basin; geophysical data; drilling; Lomonosov Ridge
Refereed: Yes
DOI etc.: 10.1134/S1028334X11100011
ISSN: 1028-334X
Projects: Otto Schmidt Laboratory
Date Deposited: 27 May 2015 08:52
Last Modified: 27 May 2015 08:52
URI: http://oceanrep.geomar.de/id/eprint/28795

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