Journal articles
Metasomatic interactions between slab-derived melts and depleted mantle: Insights from xenoliths within Monglo adakite (Luzon arc, Philippines)
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.
Cited literature [67 references]
https://hal-insu.archives-ouvertes.fr/insu-00256478
Contributor : Nathalie Pothier <>
Submitted on : Thursday, March 27, 2008 - 2:59:07 PM
Last modification on : Sunday, November 22, 2020 - 11:32:04 AM
Long-term archiving on: : Thursday, May 20, 2010 - 6:57:23 PM
Contributor : Nathalie Pothier <>
Submitted on : Thursday, March 27, 2008 - 2:59:07 PM
Last modification on : Sunday, November 22, 2020 - 11:32:04 AM
Long-term archiving on: : Thursday, May 20, 2010 - 6:57:23 PM
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Gregoire-Lithos-2008.pdf
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