Abstract
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
| Original language | English (US) |
|---|---|
| Title of host publication | Initial reports DSDP, vol. 69, Puntarenas to Balboa |
| Editors | J.R. Cann |
| Publisher | US Govt. Printing Office; UK distributors, IPOD Committee, NERC, Swindon |
| Pages | 223-235 |
| Number of pages | 13 |
| State | Published - 1983 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Environmental Science(all)
Cite this
Deep crustal geothermal measurements, Hole 504B, Deep Sea Drilling Project Legs 69 and 70. / Becker, Keir; Langseth, M. G.; Von Herzen, R. P.
Initial reports DSDP, vol. 69, Puntarenas to Balboa. ed. / J.R. Cann. US Govt. Printing Office; UK distributors, IPOD Committee, NERC, Swindon, 1983. p. 223-235.Research output: Chapter in Book/Report/Conference proceeding › Chapter
}
TY - CHAP
T1 - Deep crustal geothermal measurements, Hole 504B, Deep Sea Drilling Project Legs 69 and 70.
AU - Becker, Keir
AU - Langseth, M. G.
AU - Von Herzen, R. P.
PY - 1983
Y1 - 1983
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
UR - http://www.scopus.com/inward/record.url?scp=0021057939&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0021057939&partnerID=8YFLogxK
M3 - Chapter
SP - 223
EP - 235
BT - Initial reports DSDP, vol. 69, Puntarenas to Balboa
A2 - Cann, J.R.
PB - US Govt. Printing Office; UK distributors, IPOD Committee, NERC, Swindon
ER -