The Argo Abyssal Plain |
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| Authors: | JR Heirtzler P Cameron PJ Cook T Powell HA Roeser S Sukardi JJ Veevers |
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| Institution: | 1. Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543 U.S.A.;2. Geology and Geophysics, Bureau of Mineral Resources, Department of Natural Resources, P.O. Box 378, Canberra City, A.C.T. 2601 Australia;3. Research School of Earth Sciences, The Australian National University, P.O. Box 4, Canberra, A.C.T. 2600 Australia;4. Department of Geological Sciences, University of California, Santa Barbara, CA 93106 U.S.A.;5. Bundesanstalt für Geowissenschaften und Rohstoffe, Postfach 510153, Hannover 51 Federal Republic of Germany;6. Geological Survey of Indonesia, Jl. Diponegoro 57, Bandung Indonesia;7. School of Earth Sciences, Macquarie University, North Ryde, N.S.W. 2113 Australia |
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| Abstract: | Eighteen geophysical transects were made in the Argo Abyssal Plain to study the magnetic anomalies, bathymetry and seismic structure. Magnetic anomalies were identified as being the Mesozoic anomalies M-10 to M-25, increasing in age from the Java Trench to the northwest continental shelf of Australia. A new bathymetric map shows that the Argo Abyssal Plain is bounded by the 5600-m contour and reaches a maximum depth of 5730 m against the inshore side of the Exmouth Plateau. Joey Rise was found to limit the Argo Abyssal Plain on the southwest. Continuous seismic profiles, sonobuoy data and seismic data from other cruises permit one to contour the depths to oceanic basement. Numerous diapir-like structures were observed, but their nature and origin is obscure. |
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