Heat flow in the Lesser Antilles island arc and adjacent back arc Grenada basin

Michael Manga (1) , Matthew J. Hornbach , Anne Le Friant , Osamu Ishizuka , Nicole Stroncik , Tatsuya Adachi , Mohammed Aljahdali , Georges Boudon , Christoph Breitkreuz , Andrew Fraass , Akihiko Fujinawa , Robert Hatfield , Martin Jutzeler , Kyoko Kataoka , Sara Lafuerza , Fukashi Maeno , Michael Martinez-Colon , Molly Mccanta , Sally Morgan , Martin R. Palmer , Takeshi Saito , Angela Slagle , Adam J. Stinton , K. S. V. Subramanyam , Yoshihiko Tamura , Peter J. Talling , Benoît Villemant (2) , Deborah Wall-Palmer , Fei Wang

1 EPS - Department of Earth and Planetary Science [UC Berkeley]
2 iSTeP - Institut des Sciences de la Terre de Paris

Using temperature gradients measured in 10 holes at 6 sites, we generate the first high fidelity heat flow measurements from Integrated Ocean Drilling Program drill holes across the northern and central Lesser Antilles arc and back arc Grenada basin. The implied heat flow, after correcting for bathymetry and sedimen- tation effects, ranges from about 0.1 W/m2 on the crest of the arc, midway between the volcanic islands of Montserrat and Guadeloupe, to <0.07 W/m2 at distances >15 km from the crest in the back arc direction. Combined with previous measurements, we find that the magnitude and spatial pattern of heat flow are sim- ilar to those at continental arcs. The heat flow in the Grenada basin to the west of the active arc is 0.06 W/m2, a factor of 2 lower than that found in the previous and most recent study. There is no thermal evidence for significant shallow fluid advection at any of these sites. Present-day volcanism is confined to the region with the highest heat flow.

Domaines: Sciences de la Terre

Michael Manga, Matthew J. Hornbach, Anne Le Friant, Osamu Ishizuka, Nicole Stroncik, et al.. Heat flow in the Lesser Antilles island arc and adjacent back arc Grenada basin. Geochemistry, Geophysics, Geosystems, 2012, 13 (8), pp.1-19. ⟨10.1029/2012GC004260⟩. ⟨hal-00796877⟩