Deep crustal geothermal measurements, Hole 504B, Deep Sea Drilling Project Legs 69, 70, 83 and 92.

K. Becker, M. G. Langseth, R. P. Von Herzen, R. N. Anderson, M. A. Hobart

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

We report an extensive suite of geothermal measurements in the deepest borehole yet drilled into the oceanic crust, Hole 504B of the Deep Sea Drilling Project. Located in 5.9Ma crust of the Costa Rica Rift, Hole 504B was cored to a total depth of 1350m beneath the seafloor, through 274.5m of sediment and 1075.5m of basalt. The results indicate a dominantly conductive mode of heat transfer through the complete section, at 190+ or -10mW/m2. This is consistent with the predicted plate heat transfer and the hypothesis that the thick sediment cover acts as a seal against hydrothermal circulation of seawater to basement. For over 2yr after this sediment seal was penetrated, borehole temperatures were strongly depressed to approx 350-370m, indicating that ocean bottom water was flowing down the hole into the upper approx 100m of basement. This downhole flow was driven by the underpressure of the basement pore fluids.-from Authors

Original languageEnglish (US)
Pages (from-to)405-418
Number of pages14
JournalUnknown Journal
StatePublished - Jan 1 1985
Externally publishedYes

ASJC Scopus subject areas

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

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    Becker, K., Langseth, M. G., Von Herzen, R. P., Anderson, R. N., & Hobart, M. A. (1985). Deep crustal geothermal measurements, Hole 504B, Deep Sea Drilling Project Legs 69, 70, 83 and 92. Unknown Journal, 405-418.