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        Magmatic and amagmatic contributions to crustal growth in the Philippine island arc system: Comparison of the Cretaceous and post-Cretaceous periods

        Carla B. Dimalanta,Graciano P. Yumul, Jr. 한국지질과학협의회 2006 Geosciences Journal Vol.10 No.3

        Volume, p. 35.Yumul, G.P. Jr., Dimalanta, C.B., Tamayo, R.A.Jr. and Bellon, H.,2003b, Silicic arc volcanism in Central Luzon, Philippines: Char-acterization of its space, time and geochemical relationship. TheIsland Arc, 12, 207218.Yumul, G.P.Jr., Dimalanta, C.B., Tamayo, R.A.Jr. and Maury, R.C.,2003c, Collision, subduction and accretion events in the Philip-pines: A synthesis. The Island Arc, 12, 7791.

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        Tectonic setting of a composite terrane: A review of the Philippine island arc system

        Graciano P. Yumul Jr.,Carla B. Dimalanta,Victor B. Maglambayan,Edanjarlo J. Marquez 한국지질과학협의회 2008 Geosciences Journal Vol.12 No.1

        Features resulting from the interplay of arc magmatism, ophiolite accretion, ocean basin closure and other subsequent tectonic processes are preserved in the Philippine island arc system. Subduction of ocean floor along the trenches surrounding the Philippines is a major factor in shaping the geologic history of this island arc system. Stress-strain relationships, as manifest in both the regional and local setting of the archipelago, are derived from the interaction of at least four major plates: Sundaland, Philippine Mobile Belt, Philippine Sea and, to a certain extent, the Indo-Australian plate. Collision zones in this island arc system are characterized by the involvement of oceanic bathymetric highs (seamounts, spreading ridge, submerged continental fragment). A major strike-slip fault, the Philippine Fault Zone, with compressional and extensional components, traverses the whole archipelago where all excess stress not accommodated by the surrounding trenches is taken up. Tholeiitic through adakitic to calc-alkaline rock suites characterize the different magmatic arcs. Exposed oceanic lithospheric fragments exhibit transitional mid-ocean ridge, back arc basin to island arc geochemical characteristics. The observed crustal thickness in the Philippines resulted from combined magmatic (volcanism) and amagmatic (ophiolite accretion) processes, with the former being the dominant factor. Features resulting from the interplay of arc magmatism, ophiolite accretion, ocean basin closure and other subsequent tectonic processes are preserved in the Philippine island arc system. Subduction of ocean floor along the trenches surrounding the Philippines is a major factor in shaping the geologic history of this island arc system. Stress-strain relationships, as manifest in both the regional and local setting of the archipelago, are derived from the interaction of at least four major plates: Sundaland, Philippine Mobile Belt, Philippine Sea and, to a certain extent, the Indo-Australian plate. Collision zones in this island arc system are characterized by the involvement of oceanic bathymetric highs (seamounts, spreading ridge, submerged continental fragment). A major strike-slip fault, the Philippine Fault Zone, with compressional and extensional components, traverses the whole archipelago where all excess stress not accommodated by the surrounding trenches is taken up. Tholeiitic through adakitic to calc-alkaline rock suites characterize the different magmatic arcs. Exposed oceanic lithospheric fragments exhibit transitional mid-ocean ridge, back arc basin to island arc geochemical characteristics. The observed crustal thickness in the Philippines resulted from combined magmatic (volcanism) and amagmatic (ophiolite accretion) processes, with the former being the dominant factor.

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