Seismic imaging of transition zone discontinuities suggests hot mantle west of Hawaii

Q. Cao, R. D. Van Der Hilst, M. V. De Hoop, Sang-Heon Shim

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

The Hawaiian hotspot is often attributed to hot material rising from depth in the mantle, but efforts to detect a thermal plume seismically have been inconclusive. To investigate pertinent thermal anomalies, we imaged with inverse scattering of SS waves the depths to seismic discontinuities below the Central Pacific, which we explain with olivine and garnet transitions in a pyrolitic mantle. The presence of an 800- to 2000-kilometer-wide thermal anomaly (ΔTmax ∼300 to 400 kelvin) deep in the transition zone west of Hawaii suggests that hot material does not rise from the lower mantle through a narrow vertical plume but accumulates near the base of the transition zone before being entrained in flow toward Hawaii and, perhaps, other islands. This implies that geochemical trends in Hawaiian lavas cannot constrain lower mantle domains directly.

Original languageEnglish (US)
Pages (from-to)1068-1071
Number of pages4
JournalScience
Volume332
Issue number6033
DOIs
StatePublished - May 27 2011
Externally publishedYes

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Hot Temperature
Islands
olivine

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Seismic imaging of transition zone discontinuities suggests hot mantle west of Hawaii. / Cao, Q.; Van Der Hilst, R. D.; De Hoop, M. V.; Shim, Sang-Heon.

In: Science, Vol. 332, No. 6033, 27.05.2011, p. 1068-1071.

Research output: Contribution to journalArticle

Cao, Q. ; Van Der Hilst, R. D. ; De Hoop, M. V. ; Shim, Sang-Heon. / Seismic imaging of transition zone discontinuities suggests hot mantle west of Hawaii. In: Science. 2011 ; Vol. 332, No. 6033. pp. 1068-1071.
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