Origin of the Willaumez-Manus Rise,Papua New Guinea |
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| Authors: | R.W. Johnson J.C. Mutter R.J. Arculus |
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| Affiliation: | Bureau of Mineral Resources, Canberra City, A.C.T. Australia;Research School of Earth Sciences, Australian National University, Canberra, A.C.T. Australia |
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| Abstract: | The aseismic Willaumez-Manus Rise on the Bismarck Sea floor separates the Manus Basin from the New Guinea Basin. The rise does not appear to be an extinct spreading axis, or a remnant arc, but may be the result of excess magmatism possibly related to an inferred mantle hot spot beneath St. Andrew Strait. A preferred interpretation is that the rise is the raised edge of the New Guinea Basin, formed in response to a thermal anomaly beneath the extensional Manus Basin which formed later than the New Guinea Basin. |
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