Metasomatized Lithosphere and the Origin of Alkaline Lavas

Sébastien Pilet; Michael B. Baker; Edward M. Stolper

doi:10.1126/science.1156563

journal article May 16, 2008

Metasomatized Lithosphere and the Origin of Alkaline Lavas

Sébastien Pilet Michael B. Baker Edward M. Stolper

Science Vol. 320 No. 5878 pp. 916-919 · American Association for the Advancement of Science (AAAS)

View at Publisher Save 10.1126/science.1156563

Abstract

Recycled oceanic crust, with or without sediment, is often invoked as a source component of continental and oceanic alkaline magmas to account for their trace-element and isotopic characteristics. Alternatively, these features have been attributed to sources containing veined, metasomatized lithosphere. In melting experiments on natural amphibole-rich veins at 1.5 gigapascals, we found that partial melts of metasomatic veins can reproduce key major- and trace-element features of oceanic and continental alkaline magmas. Moreover, experiments with hornblendite plus lherzolite showed that reaction of melts of amphibole-rich veins with surrounding lherzolite can explain observed compositional trends from nephelinites to alkali olivine basalts. We conclude that melting of metasomatized lithosphere is a viable alternative to models of alkaline basalt formation by melting of recycled oceanic crust with or without sediment.

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Details

Published: May 16, 2008
Vol/Issue: 320(5878)
Pages: 916-919

Authors

S

Sébastien Pilet

Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA.

M

Michael B. Baker

Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA.

E

Edward M. Stolper

Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA.

Cite This Article

Sébastien Pilet, Michael B. Baker, Edward M. Stolper (2008). Metasomatized Lithosphere and the Origin of Alkaline Lavas. Science, 320(5878), 916-919. https://doi.org/10.1126/science.1156563

Metasomatized Lithosphere and the Origin of Alkaline Lavas

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