Figure F18. Seismic, heat flow, and calculated sediment/basement interface (SBI) temperatures across the Wuzza Bare subcrop along seismic Lines GeoB00-208 and GeoB00-205, ~5 km north-northeast of Site U1301 (line location in Fig. F3). Many of the heat flow values have large uncertainties, as indicated with the error bars, because of insertion difficulties and high frictional heating associated with coarse-grained sediments above this basement high. In combination with difficulties in determining the exact location of steeply dipping basement, this leads to large uncertainties in projected upper-basement temperatures. A. Results along Line GeoB00-208, which appears to pass close to the peak of the buried basement high. Measured seafloor heat flow (open squares), with uncertainties in measured values being smaller than the symbols. Dotted line is output of two dimensional conductive model, using lithospheric cooling curve as lower thermal boundary condition. B. Results from Line GeoB00-205, which passes ~200 m to the south. 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 = ~5.
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