The oceanic substratum of Northern Luzon: Evidence from xenoliths within Monglo adakite (the Philippines) - Archive ouverte HAL Access content directly
Journal Articles Island Arc Year : 2007

The oceanic substratum of Northern Luzon: Evidence from xenoliths within Monglo adakite (the Philippines)

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Abstract

A 8.65 Ma adakitic intrusive sheet exposed near Monglo village in the Baguio District of Northern Luzon contains a suite of ultramafic and mafic xenoliths including in order of abundance: spinel dunites showing typical mantle-related textures, mineral and bulk rock compositions, and serpentinites derived from them; amphibole-rich gabbros displaying incompatible element patterns similar to those of flat or moderately enriched back-arc basin basalt magmas; and amphibolites derived from metabasalts and/or metagabbros of identical affinity. A single quartz diorite xenolith carrying a similar subduction-related geochemical signature has also been sampled. One amphibolite xenolith provided a whole-rock K-Ar age of 115.6 Ma (Barremian). We attribute the origin of this suite to the sampling by ascending adakitic magmas of a Lower Cretaceous ophiolitic complex located at a depth within the 30-35 km thick Luzon crust. It could represent an equivalent of the Isabela-Aurora and Pugo-Lepanto ophiolitic massifs exposed in Northern Luzon.

Dates and versions

insu-00573250 , version 1 (03-03-2011)

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Betchaida D. Payot, Sébastien Jégo, René C. Maury, Mireille Polve, Michel Grégoire, et al.. The oceanic substratum of Northern Luzon: Evidence from xenoliths within Monglo adakite (the Philippines). Island Arc, 2007, 16 (2), pp.276-290. ⟨10.1111/j.1440-1738.2007.00574.x⟩. ⟨insu-00573250⟩
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