Physical and acoustic sediment properties of sediment cores from the eastern equatorial Atlantic ...
To reconstruct the deep-water circulation for the last 3.5 Ma from deep-sea sediments of the eastern equatorial Atlantic, sea floor morphology, sub-bottom reflectors and the echo character have been mapped on the basis of 3.5 kHz records and sediment cores. Physical properties of sediments and synth...
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| Format: | Article in Journal/Newspaper |
| Language: | English |
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PANGAEA
1986
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| Online Access: | https://dx.doi.org/10.1594/pangaea.548491 https://doi.pangaea.de/10.1594/PANGAEA.548491 |
| Summary: | To reconstruct the deep-water circulation for the last 3.5 Ma from deep-sea sediments of the eastern equatorial Atlantic, sea floor morphology, sub-bottom reflectors and the echo character have been mapped on the basis of 3.5 kHz records and sediment cores. Physical properties of sediments and synthetic seismograms derived from them enable us to decipher reflector sequences in environments of pelagic, current-resuspended and turbidity sedimentation. The individual reflectors originate from carbonate dissolution, hiatus, coarse sand layers and interferences. Those which are related to carbonate dissolution and hiatus provide evidence of water-mass boundaries by their distribution.Five phases of different deep-water circulation can be seen in the record of th elast 3.5 Ma, and these are related to climate history:1. Between 3.7 Ma and 2.2 Ma a strong deep-water circulation indicates a northward flow of bottom water below 4200 m (AABW = Antarctic-Bottom Water) and a southward flow of deep-water above 4200 m ... : Supplement to: Mienert, Jürgen (1986): Akustostratigraphie im äquatorialen Ostatlantik: Zur Entwicklung der Tiefenwasserzirkulation der letzten 3,5 Millionen Jahre. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe C Geologie und Geophysik, Gebrüder Bornträger, Berlin, Stuttgart, C40, 19-86 ... |
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