The chemical structure of the Hawaiian mantle plume
- 1 August 2005
- journal article
- letter
- Published by Springer Science and Business Media LLC in Nature
- Vol. 436 (7052), 837-840
- https://doi.org/10.1038/nature03907
Abstract
The Hawaiian–Emperor volcanic island and seamount chain is usually attributed to a hot mantle plume, located beneath the Pacific lithosphere, that delivers material sourced from deep in the mantle to the surface1,2,3,4,5. The shield volcanoes of the Hawaiian islands are distributed in two curvilinear, parallel trends (termed ‘Kea’ and ‘Loa’), whose rocks are characterized by general geochemical differences2,3,4,5. This has led to the proposition that Hawaiian volcanoes sample compositionally distinct, concentrically zoned, regions of the underlying mantle plume4,5. Melt inclusions, or samples of local magma ‘frozen’ in olivine phenocrysts during crystallization, may record complexities of mantle sources6, thereby providing better insight into the chemical structure of plumes. Here we report the discovery of both Kea- and Loa-like major and trace element compositions in olivine-hosted melt inclusions in individual, shield-stage Hawaiian volcanoes—even within single rock samples. We infer from these data that one mantle source component may dominate a single lava flow, but that the two mantle source components are consistently represented to some extent in all lavas, regardless of the specific geographic location of the volcano. We therefore suggest that the Hawaiian mantle plume is unlikely to be compositionally concentrically zoned. Instead, the observed chemical variation is probably controlled by the thermal structure of the plume.This publication has 31 references indexed in Scilit:
- Composition of basaltic lavas sampled by phase‐2 of the Hawaii Scientific Drilling Project: Geochemical stratigraphy and magma typesGeochemistry, Geophysics, Geosystems, 2004
- Geochemical variability in a single flow from northern IcelandJournal of Geophysical Research, 2003
- Olivine-hosted melt inclusions in Hawaiian picrites: equilibration, melting, and plume source characteristicsChemical Geology, 2002
- SIMS analysis of volatiles in silicate glasses, 2: isotopes and abundances in Hawaiian melt inclusionsChemical Geology, 2002
- Mixing and deformations in mantle plumesEarth and Planetary Science Letters, 2002
- Melting depths and mantle heterogeneity beneath Hawaii and the East Pacific Rise: Constraints from Na/Ti and rare earth element ratiosJournal of Geophysical Research, 1999
- Source characteristics derived from very incompatible trace elements in Mauna Loa and Mauna Kea basalts, Hawaii Scientific Drilling ProjectJournal of Geophysical Research, 1996
- Isotopic evolution of Mauna Kea volcano: Results from the initial phase of the Hawaii Scientific Drilling ProjectJournal of Geophysical Research, 1996
- Isotopic evolution of lavas from Haleakala Crater, HawaiiEarth and Planetary Science Letters, 1987
- Convection Plumes in the Lower MantleNature, 1971