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Komatiites and picrites: evidence that the 'plume' source is depleted

Anderson, Don L. (1994) Komatiites and picrites: evidence that the 'plume' source is depleted. Earth and Planetary Science Letters, 128 (3-4). pp. 303-311. ISSN 0012-821X.

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High-temperature magmas such as picrites and komatiites are candidates for the material in the hot axial region of mantle plumes. In current plume theories these magmas should have an enriched ocean-island basalt (OIB) type chemistry. High MgO magmas, however, are often more like depleted mid-ocean ridge basalts (MORB) in trace element and isotopic chemistry. This is a paradox for deep mantle plume, or primitive mantle, theories but is expected if hotspots and MORB share a common depleted source and the transition to OIB chemistry involves shallow-level cooling, crystal fractionation and contamination. Ancient komatiites appear to have come from the same deep depleted reservoir as modern picrites and MORB.

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Additional Information:© 1994 Elsevier Science B.V. Received 11 June 1994; accepted 29 August 1994. I appreciate the comments of Bruce Marsh. I thank Eleanor and John R. McMillan and their family for their support. This research was also supported by NSF Grants No. EAR-9002947 and EAR-9218390. Contribution No. 5323 Division of Geological and Planetary Sciences, Caltech, Pasadena, CA 91125.
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Caltech Division of Geological and Planetary Sciences5323
Issue or Number:3-4
Record Number:CaltechAUTHORS:20140512-132136400
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Official Citation:Anderson, D. L. (1994). Komatiites and picrites: evidence that the ‘plume’ source is depleted. Earth and Planetary Science Letters, 128(3–4), 303-311. doi:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45692
Deposited By: Jason Perez
Deposited On:12 May 2014 20:48
Last Modified:03 Oct 2019 06:34

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