A geophysical survey of the De Gerlache Seamounts: preliminary results |
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| Authors: | Rick A Hagen Karsten Gohl Rainer Gersonde Gehard Kuhn David Völker V N Kodagali |
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| Institution: | (1) Naval Research Laboratory, Code 7420, 4555 Overlook Ave. SW, Washington, DC 20375, USA, US;(2) School of Earth Sciences, Macquarie University, Sydney, New South Wales, 2109 Australia, AU;(3) Alfred Wegener Institute for Polar and Marine Research, Postfach 120161, 27515 Bremerhaven, Germany, DE;(4) Fachbereich Geowissenschaften, University of Bremen, 28359 Bremen, Germany, DE;(5) National Institute of Oceanography, Dona Paula, Goa, India, IN |
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| Abstract: | The De Gerlache Seamounts actually consist of two medium-sized guyots, with summits at depths of 350–600 m. Acoustic profiler
data show no significant sediment on these guyots. Alkaline basalts dredged from the summit of the eastern guyot yield K/Ar
ages between 20.1±1.0 and 23.2±1.2 Ma. Basement ridges and sediment-filled troughs between the guyots are associated with
the prominent gravity anomaly extending north from the Antarctic margin. This structure possibly played a role in the guyot
formation, however, the question of how the De Gerlache Seamounts are related to this gravity anomaly remains uncertain.
Received: 13 February 1997 / Revision received: 30 September 1997 |
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