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JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 102, NO. B10, PAGES 22,731–22,747, 1997

Heat flow over Reunion hot spot track: Additional evidence for thermal rejuvenation of oceanic lithosphere

Alain Bonneville

Laboratoire de Géosciences Marines et Télédétection, Université Française du Pacifique, Punaauia, Tahiti, French Polynesia

Richard P. Von Herzen

Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts

Francis Lucazeau

Centre National de la Recherche Scientifique, URA Géophysique et Tectonique, Université de Montpellier II, Montpellier, France

Abstract

We present 99 new heat flow determinations obtained with a regular sampling (2–3 km) along two seismic profiles across the Mascarene Ridge, Indian Ocean. This aseismic ridge is volcanic relief due to the activity of a hot spot, now responsible of the active volcanism of Reunion Island. Our sampling technique allows us to identify short-wavelength processes such as slope-driven water flows that affect heat flow on the ridge. With the exception of these perturbed sites, heat flow appears to be very uniform across the ridge and significantly higher (6–8 mW m⁻²) than the reference heat flow predicted for the seafloor age. Although this anomaly is low, it confirms other evidence for thermal rejuvenation of the lithosphere based on gravity and bathymetry. The set of information now available for the Mascarene Ridge seems to indicate a mixed mode of compensation with dynamical support below the front of the swell track and thermal support behind for the older part of the swell.

Received 20 November 1995; accepted 27 March 1997.

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Citation: Bonneville, A., R. P. Von Herzen, and F. Lucazeau (1997), Heat flow over Reunion hot spot track: Additional evidence for thermal rejuvenation of oceanic lithosphere, J. Geophys. Res., 102(B10), 22,731–22,747.

Copyright 1997 by the American Geophysical Union.