Hyperbolic echo zones in the eastern Atlantic and the structure of the southern Madeira Rise

Details Hyperbolic echo zones in the eastern Atlantic and the structure of the southern Madeira Rise Hyperbolic echo zones in the eastern Atlantic and the structure of the southern Madeira Rise

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978e%26psl..41..419e&link_type=abstract

Earth and Planetary Science Letters, Volume 41, Issue 4, p. 419-433.

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The Madeira Rise is a 450 km northeast-trending structural-sedimentary feature which lies west of the Madeira Islands. Its northern half is controlled by a basement ridge, but its southern section consists of an apparent current-controlled sediment deposit. Its maximum sediment thickness is about 1 km over a relatively level basement. There are two reflectors which can be traced within the sediment pile. A shallow reflector (R1) may mark the termination of a rapid constructional phase of the drift. Sediment cores taken on the southern Madeira Rise have recovered brown marls and chalks with sedimentation rates of only about 1.5 cm/1000 years over the last 225,000 years. A striking zone of hyperbolic reflectors mapped around the flank of the southern Madeira Rise in the 4000-4800 m depth range may be the expression of bedforms created by contour-following currents. Another zone of hyperbolic echoes is found on the continental rise at about 24-26°N in a similar depth range. Trend determinations in this area suggest that the bedforms which give rise to the hyperbolae are oriented north-northeast and may be similar to the abyssal furrows discovered by DEEP-TOW observations on the Blake-Bahama Outer Ridge. The bottom photographs available from both hyperbolic echo zones show a tranquil bottom. This suggests that the hyperbolic bedforms are relict. Also: Department of Geological Sciences, Columbia University.

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