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Formation of harzburgite by pervasive melt/rock reaction in the upper mantle

Nature

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Abstract

Many mantle peridotite samples are too rich in SiO2 (in the form of orthopyroxene) and have ratios of light to heavy rare earth elements that are too high to be consistent with an origin as the residuum of partial melting of the primitive mantle. Trace element studies of melt/rock reaction zones in the Trinity peridotite provide evidence for reaction of the mantle lithosphere with ascending melts, which dissolved calcium-pyroxene and precipitated orthopyroxene as magma mass decreased. This process can account for the observed major and trace element compositions of lithospheric mantle samples, and may accordingly be prevalent in the upper mantle.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Formation of harzburgite by pervasive melt/rock reaction in the upper mantle
Series title:
Nature
Volume
358
Issue:
6388
Year Published:
1992
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Nature
First page:
635
Last page:
641
Number of Pages:
7