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

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266

作者：

PB Kelemen，HJB Dick，JE Quick

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摘要：

Many mantle peridotite samples are too rich in Si0 2 (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.

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关键词：

Bibliography, Theoretical or Mathematical/ Earth mantle geochemistry minerals rocks/ harzburgite formation upper mantle orthopyroxene rare earth elements melt/rock reaction zones Trinity peridotite mantle lithosphere ascending melts pyroxene trace element compositions SiO 2/ A9135L Geochemistry A9135G Earth crust and upper mantle/ SiO2/bin O2 /bin Si/bin O/bin