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

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.
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Submitted on : Thursday, March 3, 2011 - 11:17:04 AM
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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, Wiley, 2007, 16 (2), pp.276-290. ⟨10.1111/j.1440-1738.2007.00574.x⟩. ⟨insu-00573250⟩

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