NDLI: Variations in bottom water activity at the southern Argentine margin: indications from a seismic analysis of a continental slope terrace

Content Provider	Springer Nature Link
Author	Gruetzner, Jens Uenzelmann Neben, Gabriele Franke, Dieter
Copyright Year	2011
Abstract	Continental slope terraces at the southern Argentine margin are part of a significant contourite depositional system composed of a variety of drifts, channels, and sediment waves. Here, a refined seismostratigraphic model for the sedimentary development of the Valentin Feilberg Terrace located in ~4.1 km water depth is presented. Analyzing multichannel seismic profiles across and along this terrace, significant changes in terrace morphology and seismic reflection character are identified and interpreted to reflect variations in deep water hydrography from Late Miocene to recent times, involving variable flow of Antarctic Bottom Water and Circumpolar Deep Water. A prominent basin-wide aggradational seismic unit is interpreted to represent the Mid-Miocene climatic optimum (~17–14 Ma). A major current reorganization can be inferred for the time ~14–12 Ma when the Valentin Feilberg Terrace started growing due to the deposition of sheeted and mounded drifts. After ~12 Ma, bottom water flow remained vigorous at both margins of the terrace. Another intensification of bottom flow occurred at ~5–6 Ma when a mounded drift, moats, and sediment waves developed on the terrace. This may have been caused by a general change in deep water mass organization following the closure of the Panamanian gateway, and a subsequent stronger southward flow of North Atlantic Deep Water.
Starting Page	405
Ending Page	417
Page Count	13
File Format	PDF
ISSN	02760460
Journal	Geo-Marine Letters
Volume Number	31
Issue Number	5-6
e-ISSN	14321157
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-08-09
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Geology
Content Type	Text
Resource Type	Article
Subject	Environmental Science Geotechnical Engineering and Engineering Geology Oceanography

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