Geothermal measurements from drilling of sediments near the Galapagos spreading center, 86oW, Deep Sea Drilling Project Leg 70.

K. Becker, R. P. Von Herzen, S. Karato

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Heat transfer processes at the mounds area of the Galapagos Spreading Center at 86oW are revealed by temperatures measured at approx 10m intervals in the 30+ or -10m sediment at each of 12 holes at Leg 70, Sites 506-509. Two hundred 14 needle-probe values show a significant linear increase of thermal conductivity with depth in each hole. About half of the temperature-thermal resistance profiles are nonlinear and are fit to a steady-state, vertical pore-water convection model. Results indicate high and variable total heat flow and localized hydrothermal discharge at = or <10-8m/s, associated with individual mounds. Recharge at similar rates is indicated in the low heat-flow belt approx 5km S of the mounds. Possible slow entrained recharge within 100m of discharging mounds is suggested. At Site 510, temperatures in the 114m sediment cover on 2.7Ma old crust are linear, suggesting that the hydraulic resistance of this layer is sufficient to seal off free hydrothermal exchange between basement and bottom water.-Authors

Original languageEnglish (US)
Pages (from-to)445-458
Number of pages14
JournalUnknown Journal
StatePublished - Jan 1 1983
Externally publishedYes

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Geothermal measurements from drilling of sediments near the Galapagos spreading center, 86oW, Deep Sea Drilling Project Leg 70.'. Together they form a unique fingerprint.

  • Cite this