Journal articles
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.
https://hal-insu.archives-ouvertes.fr/insu-00573250
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Submitted on : Thursday, March 3, 2011 - 11:17:04 AM
Last modification on : Monday, May 16, 2022 - 8:20:17 AM
Contributor : Adminhal Univbrestbu Connect in order to contact the contributor
Submitted on : Thursday, March 3, 2011 - 11:17:04 AM
Last modification on : Monday, May 16, 2022 - 8:20:17 AM
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