Enhanced mantle conductivity from sulfide minerals, southern Sierra Nevada, California

Mihai N. Ducea, Stephen K. Park

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

Petrographic studies of peridotitic xenoliths entrained in late Quaternary basalts from beneath the southern Sierra Nevada have revealed the presence of accessory sulfide minerals along grain boundaries and fractures. Equilibration temperatures from the xenoliths are sufficiently high that the molten sulfides coexist with the basaltic melt. Sulfides are extremely conductive relative to the solid matrix or the basaltic melt, so a small fraction can increase the bulk conductivity of the mantle appreciably. Previous estimates of 2-5% partial melt from magnetotelluric measurements can be plausibly reduced to less than 1%. Such low melt percentages have longer residence times in the mantle and are more consistent with the volumetrically minor late Quaternary basalt flows and the primitive basalt compositions.

Original languageEnglish (US)
Pages (from-to)2405-2408
Number of pages4
JournalGeophysical Research Letters
Volume27
Issue number16
DOIs
StatePublished - Aug 15 2000

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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