Deep crustal geothermal measurements, Hole 504B, Deep Sea Drilling Project Legs 69 and 70.

K. Becker, M. G. Langseth, R. P. Von Herzen

Research output: Contribution to journalArticle

22 Scopus citations

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 languageEnglish (US)
Pages (from-to)223-235
Number of pages13
JournalUnknown Journal
StatePublished - Jan 1 1983
Externally publishedYes

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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