Heat flow in the Lesser Antilles island arc and adjacent back arc Grenada basin
Manga, Michael, Hornbach, Matthew J., Le Friant, Anne, Ishizuka, Osamu, Stroncik, Nicole, Adachi, Tatsuya, Aljahdali, Mohammed, Boudon, Georges, Breitkreuz, Christoph, Fraass, Andrew, Fujinawa, Akihiko, Hatfield, Robert, Jutzeler, Martin, Kataoka, Kyoko, Lafuerza, Sara, Maeno, Fukashi, Martinez-Colon, Michael, McCanta, Molly, Morgan, Sally, Palmer, Martin R., Saito, Takeshi, Slagle, Angela, Stinton, Adam J., Subramanyam, K.S.V., Tamura, Yoshihiko, Talling, Peter J., Villemant, Benoit, Wall-Palmer, Deborah and Wang, Fei (2012) Heat flow in the Lesser Antilles island arc and adjacent back arc Grenada basin. Geochemistry Geophysics Geosystems, 13, Q08007. (doi:10.1029/2012GC004260).
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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 0.1 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 similar 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.
|Subjects:||G Geography. Anthropology. Recreation > GC Oceanography
Q Science > QE Geology
|Divisions:||Faculty of Natural and Environmental Sciences > Ocean and Earth Science > Geochemistry
National Oceanography Centre (NERC) > Marine Geoscience
|Date Deposited:||02 Oct 2012 15:36|
|Last Modified:||23 Jun 2014 09:00|
IODP Leg 340 Lesser Antilles
Funded by: NERC (NE/J020168/1)
Led by: Martin Ralph Palmer
1 March 2012 to 30 April 2012
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