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Kimberlite and the Evolution of the Mantle

Anderson, Don L. (1982) Kimberlite and the Evolution of the Mantle. In: Kimberlites. I: Kimberlites and Related Rocks. Developments in petrology. No.11A. Elsevier , Amsterdam, pp. 395-403. ISBN 9780444415622. http://resolver.caltech.edu/CaltechAUTHORS:20140507-084249617

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Abstract

Kimberlites are extremely enriched in the incompatible elements and are therefore important in discussions of the trace-element inventory of the Earth's mantle. Such extreme enrichment implies that kimberlites represent a small degree of partial melting of a mantle silicate or a late-stage residual fluid of a crystallizing cumulate layer. The LIL (large-ion lithophile) elements in kimberlite show that they have been in equilibrium with a garnet-clinopyroxene rich source region, possibly an eclogite cumulate. The LIL contents of kimberlite and MORB (mid-ocean ridge basalts) are complementary. Removal of a kimberlite-like fluid from an eclogite cumulate gives a crystalline residue with the required geochemical characteristics of the depleted source region that provides MORB. Kimberlite and lunar KREEP are remarkably similar in their minor and trace element chemistry. The main differences can be attributed to plagioclase fractionation in the case of KREEP and eclogite fractionation in the case of kimberlite. KREEP has been interpreted as the residual fluid of a crystallizing magma ocean. In a small body the Al_2O_3 content of a crystallizing melt is reduced by rilagioclase crystallization and flotation. In a magma ocean on a large body, such as the Earth, the Al_2O_3 is removed by the sinking of garnet. Kimberlite, in fact, is depleted in eclogite elements including the HREE and Na. This suggests that kimberlite may represent the late-stage residual fluid of a crystallizing terrestrial magma ocean. A buried eclogite cumulate layer is the terrestrial equivalent of the lunar anorthositic crust.


Item Type:Book Section
Additional Information:© 1984 Elsevier Science Publishers B.V., Amsterdam. This research was supported by the Division of Earth Sciences, National Science Foundation, grant number EAR811-5236. Contribution number 3839, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125.
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NSFEAR811-5236
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Caltech Division of Geological and Planetary Sciences3839
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Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140507-084249617
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45550
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:07 May 2014 16:27
Last Modified:07 May 2014 16:27

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