TY - JOUR
T1 - Deep crustal geothermal measurements, Hole 504B, Deep Sea Drilling Project Legs 69 and 70.
AU - Becker, K.
AU - Langseth, M. G.
AU - Von Herzen, R. P.
PY - 1983/1/1
Y1 - 1983/1/1
N2 - Seven temperature logs at Deep Sea Drilling Project Hole 504B reveal the geothermal state of the ocean crust to a depth of 836 m. A linear temperature profile in the 275 m of sediments fixes the heat flow at 196 W/m2, by dominantly conductive means. Two logs after Leg 69 drilling to 489 meters strongly indicate drawdown of bottom water into basement. Equilibrium temperatures fix the flow rate at 90+ or -5 m/hr, and indicate that the mass flux is directed into a thin zone from 330 to 360 m sub-bottom. Extrapolation to equilibrium temperature of two logs after completion of all drilling shows that the gradient is linear from 489 to 837 m, with a dominantly conductive heat flow of 188 mW/m2, in excellent agreement with the value obtained in the sediments. In combination with the in situ pressure data of Zoback and Anderson (this volume) , the temperature data indicate that the aquifer from 330 to 360 meters has anomalously high permeability of 0.2 darcy (2 X 10-13m2), and extends radially at least 1 km from the hole. -Authors
AB - Seven temperature logs at Deep Sea Drilling Project Hole 504B reveal the geothermal state of the ocean crust to a depth of 836 m. A linear temperature profile in the 275 m of sediments fixes the heat flow at 196 W/m2, by dominantly conductive means. Two logs after Leg 69 drilling to 489 meters strongly indicate drawdown of bottom water into basement. Equilibrium temperatures fix the flow rate at 90+ or -5 m/hr, and indicate that the mass flux is directed into a thin zone from 330 to 360 m sub-bottom. Extrapolation to equilibrium temperature of two logs after completion of all drilling shows that the gradient is linear from 489 to 837 m, with a dominantly conductive heat flow of 188 mW/m2, in excellent agreement with the value obtained in the sediments. In combination with the in situ pressure data of Zoback and Anderson (this volume) , the temperature data indicate that the aquifer from 330 to 360 meters has anomalously high permeability of 0.2 darcy (2 X 10-13m2), and extends radially at least 1 km from the hole. -Authors
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M3 - Article
AN - SCOPUS:0021057939
SP - 223
EP - 235
JO - Scientific Computing and Instrumentation
JF - Scientific Computing and Instrumentation
SN - 1078-8956
ER -