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

Michael Manga*, 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. PalmerTakeshi Saito, Angela Slagle, Adam J. Stinton, K. S.V. Subramanyam, Yoshihiko Tamura, Peter J. Talling, Benoit Villemant, Deborah Wall-Palmer, Fei Wang

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

23 Citations (Scopus)

Abstract

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 sedimentation effects, ranges from about 0.1W/m2 on the crest of the arc, midway between the volcanic islands of Montserrat and Guadeloupe, to<0.07W/m2 at distances>15km from the crest in the back arc direction. Combined with previous measurements, we find that the magnitude and spatial pattern of heat flow are similar to those at continental arcs. The heat flow in the Grenada basin to the west of the active arc is 0.06W/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.

Original languageEnglish
Article numberQ08007
JournalGeochemistry, Geophysics, Geosystems
Volume13
Issue number8
DOIs
Publication statusPublished - 1 Aug 2012

Keywords

  • back arc
  • Grenada basin
  • heat flow
  • IODP
  • Lesser Antilles
  • volcanic arc

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