Figure F268. Predicted conductive temperature distribution for basal lithospheric heat flows in Hole U1309D consistent with 1 and 2 m.y. old oceanic crust. The measured distribution of thermal conductivities from Expeditions 304 and 305 coupled with Fourier’s law were used to predict crustal temperatures as a function of depth. Maximum bottom hole temperatures (BHTs) are predicted to be 130°–145°C, consistent with various methods to obtain BHT during drilling operations. Because of fluid circulation during drilling, temperature measurements are considered a minimum. Thermal tabs (red circles) give minimum temperatures of 70° and 108°C at 1171 and 1220 mbsf, respectively. Triple combo TAP tool (yellow circles) = 52°C at 562 mbsf, 57°C at 700 mbsf, and 69°C at 754 mbsf. GBM magnetometer tool monitors temperature as a function of time both during descent (purple curve) and ascent (pink curve).
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