Correlation of seismic and petrologic thermometers suggests deep thermal anomalies beneath hotspots

Anna M. Courtier, Matthew G. Jackson, Jesse F. Lawrence, Zhengrong Wang, Cin Ty Aeolus Lee, Ralf Halama, Jessica M. Warren, Rhea Workman, Wenbo Xu, Marc M. Hirschmann, Angela M. Larson, Stan R. Hart, Carolina Lithgow-Bertelloni, Lars Stixrude, Wang Ping Chen

Research output: Contribution to journalArticle

72 Scopus citations

Abstract

A fundamental question regarding the dynamics of mantle convection is whether some intraplate volcanic centers, known as "hotspots," are the surface manifestations of hot, narrow, thermally driven upwellings, or plumes, rising from the lower mantle. Shown here is a global negative correlation between the thickness of the mantle transition zone (near 410-660 km depth) and petrologically determined potential temperatures of mid-ocean ridge and hotspot magmas. Hotspot potential temperatures are systematically higher than those for mid-ocean ridges, and the transition zone thicknesses beneath these hotspots are thinner. Thus, the majority of oceanic intraplate magmatic centers are associated with deep-seated thermal anomalies, suggesting that such magmatism is probably associated with thermal plumes.

Original languageEnglish (US)
Pages (from-to)308-316
Number of pages9
JournalEarth and Planetary Science Letters
Volume264
Issue number1-2
DOIs
StatePublished - Dec 15 2007

Keywords

  • mantle plumes
  • mantle potential temperature
  • transition zone thickness

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    Courtier, A. M., Jackson, M. G., Lawrence, J. F., Wang, Z., Lee, C. T. A., Halama, R., Warren, J. M., Workman, R., Xu, W., Hirschmann, M. M., Larson, A. M., Hart, S. R., Lithgow-Bertelloni, C., Stixrude, L., & Chen, W. P. (2007). Correlation of seismic and petrologic thermometers suggests deep thermal anomalies beneath hotspots. Earth and Planetary Science Letters, 264(1-2), 308-316. https://doi.org/10.1016/j.epsl.2007.10.003