Mantle potential temperature estimates and primary melt compositions of the low-ti emeishan flood basalt

J. G. Shellnutt, Thuy T. Pham

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The Late Permian Emeishan large igneous province (ELIP) is considered to be one of the best examples of a mantle plume derived large igneous province. One of the primary observations that favor a mantle plume regime is the presence of ultramafic volcanic rocks. The picrites suggest primary mantle melts erupted and that mantle potential temperatures (TP) of the ELIP were >200° C above ambient mantle conditions. However, the picrites may represent a mixture of liquid and cumulus olivine and pyroxene rather than primary liquids. Consequently, temperature estimates based on the picrite compositions may not be accurate. Here we calculate mantle potential temperature (TP) estimates and primary liquids compositions using PRIMELT3 for the low-Ti (Ti/Y < 500) Emeishan basalt as they represent definite liquid compositions. The calculated TP yield a range from ∼1,400 to ∼1,550° C, which is consistent with variability across a mantle plume axis. The primary melt compositions of the basalts are mostly picritic. The results of this study indicate that the Emeishan basalt was produced by a high temperature regime and that a few of the ultramafic volcanic rocks may be indicative of primary liquids.

Original languageEnglish
Article number67
JournalFrontiers in Earth Science
Volume6
DOIs
Publication statusPublished - 2018 May 31

Keywords

  • Emeishan large igneous province
  • Mantle plume
  • Mantle potential temperatures
  • Permian
  • Primary melt composition

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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