Heat flow maintained in ocean basins of great age - Investigations in the north-equatorial West Pacific

Details Heat flow maintained in ocean basins of great age - Investigations in the north-equatorial West Pacific Heat flow maintained in ocean basins of great age - Investigations in the north-equatorial West Pacific

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990geoji.102..603l&link_type=abstract

Geophysical Journal International (ISSN 0955-419X), vol. 102, Sept. 1990, p. 603-630.

Other

22

Equatorial Regions, Heat Flux, Lithosphere, Pacific Ocean, Structural Basins, Atmospheric Boundary Layer, Equilibrium Methods, Ocean Bottom, Thermal Conductivity

Scientific paper

Results are reported from multipenetration heat flow measurements made at four sites in deep basins of the west-central Pacific Ocean. Each site was surveyed by single-channel seismic reflection profiling, and provided a gravity core. Thermal conductivity was measured in situ over the entire depth intervals used for determination of the gradients, and the reduction scheme iterated conductivity and heat-capacity changes into the fitting procedure. Heat flow variations were found to be real, and not caused by thermal refraction. In at least one area (the West Mariana Basin) the presence of a small volcanic outcrop does not depress the local heat flow by venting hydrothermal circulation, as occurs on young seafloor. It is shown that the uniformitarian hypotheses of boundary-layer cooling, and the presence of a 'magic' temperature boundary at depth are not consistent with the data. It is suggested that additional topographic variation is caused by the different accumulations of sediment and lava flows at each site.

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