Thermal diffusivity of MORB-composition rocks to 15 GPa: implications for triggering of deep seismicity

David P Dobson, Simon A Hunt, Richard McCormack, Oliver T Lord, Weidner Donald J., Li Li, Andrew M Walker

Research output: Contribution to journalArticle (Academic Journal)peer-review

8 Citations (Scopus)
257 Downloads (Pure)

Abstract

We have measured the thermal diffusivity of eclogite and majorite with a model MORB composition at pressures of 3 and 15 GPa, respectively. Both phase assemblages show inverse dependences of their thermal diffusivities on temperature: eclogite=9(10)×10−10+7(1)×10−4/T(K) m 2/s and D majorite=6.2(5)×10−7+3.0(5)×10−4/T(K) m 2/s. The values for majorite are in good agreement with previous measurements for other garnets and are considerably lower than thermal diffusivities of wadsleyite and ringwoodite, which are the main components of the mantle transition zone. We discuss the implications of the low thermal conductivity of subducted oceanic crust in the transition zone for the triggering of deep seismicity.
Translated title of the contributionThermal diffusivity of MORB-composition rocks to 15 GPa: implications for triggering of deep seismicity
Original languageEnglish
Pages (from-to)406-414
Number of pages9
JournalHigh Pressure Research
Volume30
Issue number3
Early online date8 Sep 2010
DOIs
Publication statusPublished - 2010

Bibliographical note

Date of Acceptance: 17/08/2010

Keywords

  • thermal diffusion
  • MORB
  • majorite
  • deep earthquakes
  • high pressure

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