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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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C.B. Dimalanta,L.O. Suerte,G.P. Yumul Jr.,R.A. Tamayo Jr.,E.G.L. Ramos 한국지질과학협의회 2006 Geosciences Journal Vol.10 No.3
The Central Philippines is made up of several Cre-taceous oceanic lithospheres that were generated and emplaced ina variety of geologic setting and manner. The Antique OphioliteComplex exposed along the western side of Central Philippines isassociated with blueschists, which sugests tectonic erosion accom-panied subduction during its emplacement. Mlanges are associ-ophiolitic rocks suggesting that subduction kneading was a majorprocess during the emplacement of these oceanic fragments. Thegeology and geochemistry of the Tacloban Ophiolite Complex inNorthern Leyte, the Malitbog Ophiolite Complex in Southern Leyteand the dismembered ophiolitic sequence in southern Samar implythat subduction played a role in the generation and emplacementof these Cretaceous oceanic lithospheres. Whole rock major andtrace element, along with spinel mineral chemistry, favor a supra-subduction zone origin for these ophiolites. The ophiolites becomeyounger towards the east (present-day geographic setting) indicat-similarities in the petrologic features, geochemical signatures andages displayed by these oceanic lithosphere fragments in CentralPhilippines indicate that they were probably derived from a singleCretaceous oceanic basin which could have been a part of theproto-Philippine Sea Plate.
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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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D.V. Faustino,G.P. Yumul, Jr.,C.B. Dimalanta,J.V. de Jesus,M-F. Zhou,J.C. Aitchison,R.A. Tamayo, Jr. 한국지질과학협의회 2006 Geosciences Journal Vol.10 No.3
The Early Cretaceous Southeast Bohol Ophiolite-Cansiwang Mlange Complex and the Alicia Schist form thebasement of southeastern Bohol Island in central Philippines.New geochemical data show that four discrete groups consti-tute the volcanic and associated hypabyssal rocks of the ophi-olite-mlange complex: boninitic rocks (BON), enriched andnormal mid-ocean ridge basalt-like rocks (E-MORB; N-MORB) and high-magnesian andesites (HMA). Of these fourgroups, the BON are the most depleted in REEs and with themost pronounced negative Nb anomalies. Both MORB-liketypes exhibit subduction-zone influence as reflected in theirslight negative Nb anomalies. Characteristically with flat andLREE-depleted patterns, the HMA samples apear to mimicN-MORB patterns but with lower REE concentrations. Thisgeochemical diversity is best explained by a suprasubductionzone environment of formation as is also evident from field geo-believed to have ben concurrent with the ophiolite’s emplace-ment by subduction-accretion along a forearc margin. This tec-tonic boundary was later jammed into inactivity with the entryof the Alicia Schist that most likely was an oceanic bathymetrichigh. The intercalation of both tufaceous materials and pelagicchert with the pillow basalts are consistent with a marginalbasin tectonic setting.
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