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 language | English |
|---|---|
| Title of host publication | Proc., scientific results, ODP, Leg 125, Bonin/Mariana region |
| Editors | P. Fryer, J.A. Pearce |
| Pages | 487-506 |
| Number of pages | 20 |
| Publication status | Published - 1 Dec 1992 |