Trace element geochemistry of peridotites from the Izu-Bonin-Mariana Forearc, Leg 125

I. J. Parkinson, J. A. Pearce, M. F. Thirlwall, K. T M Johnson, G. Ingram

Research output: Chapter in Book/Report/Conference proceedingChapter in a book

127 Citations (Scopus)

Abstract

Trace element analyses were carried out on whole rocks and minerals from 10 peridotite samples from both Conical Seamount in the Mariana forearc and Torishima Forearc Seamount in the Izu-Bonin forearc. The concentrations of incompatible trace elements are generally low, reflecting the highly residual nature of the peridotites and their low clinopyroxene content (<2%). Covariation diagrams based on clinopyroxene data show that Ti and the HREEs plot on an extension of an abyssal peridotite trend to more residual compositions. Compared with boninites sampled from the Izu-Bonin-Mariana forearc, the peridotites are significantly more enriched in LREEs. Modeling of the melting process indicates that if they represent the most depleted residues of the melting events that generated forearc boninites they must have experienced subsolidus enrichment in these elements, as well as in Rb, Sr, Zr, Nb, Sm, and Eu. -from Authors

Original languageEnglish
Title of host publicationProc., scientific results, ODP, Leg 125, Bonin/Mariana region
EditorsP. Fryer, J.A. Pearce
Pages487-506
Number of pages20
Publication statusPublished - 1 Dec 1992

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