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RISS 인기검색어
- 검색키워드
- 저자 : G.P. Yumul, Jr. (검색결과 2 건)
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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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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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