Metasomatic interactions between slab-derived melts and depleted mantle: insights from xenoliths within Monglo adakite (Luzon arc, Philippines)

M. Gregoire*, S. Jego, R. C. Maury, M. Polve, B. Payot, R. A. Tamayo, G. P. Yumul

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

The Monglo adakite contains mafic and ultramafic xenoliths, which probably originated from the mantle section of an Early Cretaceous supra-subduction zone ophiolitic complex located within the Luzon arc crust. Spinel-bearing dunites are dominant among this xenolith collection and display evidence for three episodes of subduction-related melt percolation. The first one is evidenced by an undeformed clinopyroxene characterized by convex-upwards REE pattern. This clinopyroxene crystallized from a calc-alkaline basaltic magma, likely formed in the Cretaceous supra-subduction setting of the ophiolite. Then, two metasomatic events, evidenced by orthopyroxene-rich and amphibole-rich secondary parageneses, respectively, affected most of the spinel dunites. The opx-rich paragenesis is related to the circulation within the dunitic upper mantle of hydrous slab-derived melts similar to those affecting the mantle peridotite xenoliths from Papua New Guinea and Kamchatka. Finally the amphibole-rich veins are related to the interaction between the studied dunite xenoliths and the host adakite or an adakitic melt similar to it.

Original languageEnglish
Pages (from-to)415-430
Number of pages16
JournalLithos
Volume103
Issue number3-4
DOIs
Publication statusPublished - Jul 2008
Externally publishedYes

Keywords

  • Adakite
  • Dunite
  • Luzon arc
  • Mantle xenoliths
  • Metasomatism
  • Trace elements

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