Figure F15. Seismic, heat flow, and calculated sediment/basement interface (SBI) temperatures along seismic Line GeoB00-240, across the eastern part of the hydrothermal transition area and First Ridge (line location shown in Fig. F4). A. Measured seafloor heat flow (open squares), with uncertainties in RetroFlux (eastern) values shown with horizontal bars. Dotted line is output of two dimensional conductive model, using lithospheric cooling curve as lower thermal boundary condition. B. Calculated SBI temperatures (circles) based on heat flow and seismic data and output of two-dimensional conductive model (dotted line). Uncertainties in upper basement temperatures are indicated by vertical bars, based on the accumulation of errors through downward-continuation calculations, as described in the text. C. Seismic data overlain by isotherms calculated from measured seafloor heat flow. Vertical exaggeration = ~10.
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