Translation and docking of an arc terrane: geological and geochemical evidence from the southern Zambales Ophiolite Complex, Philippines

Yumul, Graciano P.; Dimalanta, Carla B.; Faustino, Decibel V.; Jesus, Joel V. De

doi:10.1016/s0040-1951(98)00096-1

Cited by 31 publications

(21 citation statements)

References 31 publications

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“…1b). The present disposition of the Acoje Block is postulated to be the result of the southward translation of San Antonio Massif with respect to northern Masinloc Massif (Yumul et al, 1998). Crustal thickness estimates, based on SW-NE transects of the northern Masinloc Massif, are up to 9.5 km for the mantle section and 7 km for the lower crustal section.…”

Section: Geologic Backgroundmentioning

confidence: 88%

Boninite and boninite-series volcanics in northern Zambales ophiolite: doubly vergent subduction initiation along Philippine Sea plate margins

Perez

Umino

Yumul³

et al. 2018

Solid Earth

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Abstract. A key component of subduction initiation rock suites is boninite, a high-magnesium andesite that is uniquely predominant in western Pacific forearc terranes and in select Tethyan ophiolites such as Oman and Troodos. We report, for the first time, the discovery of low-calcium, high-silica boninite in the middle Eocene Zambales ophiolite (Luzon Island, Philippines). Olivine–orthopyroxene microphyric high-silica boninite, olivine–clinopyroxene–phyric low-silica boninite and boninitic basalt occur as lapilli fall deposits and pillow lava flows in the upper volcanic unit of the juvenile arc section (Barlo locality, Acoje Block) of the Zambales ophiolite. This upper volcanic unit overlies a lower volcanic unit consisting of basaltic andesite, andesite to dacitic lavas and explosive eruptive material (subaqueous pahoehoe and lobate sheet flows, agglutinate and spatter deposits) forming a low-silica boninite series. The overall volcanic stratigraphy of the extrusive sequence at Barlo resembles holes U1439 and U1442 drilled by IODP Expedition 352 in the Izu–Ogasawara (Bonin) trench slope. The presence of depleted proto-arc basalts in the Coto Block (45 Ma) (Geary et al., 1989), boninite and boninite series volcanics in Barlo (Acoje Block (44 Ma)) and simultaneous and post-boninite moderate-Fe arc tholeiites in Sual and Subic areas of the Acoje Block (44–43 Ma) indicate that the observed subduction initiation stratigraphy in the Izu–Ogasawara–Mariana forearc is also present in the Zambales ophiolite. Paleolatitudes derived from tilt-corrected sites in the Acoje Block place the juvenile arc of northern Zambales ophiolite in the western margin of the Philippine Sea plate. In this scenario, the origin of Philippine Sea plate boninites (IBM and Zambales) would be in a doubly vergent subduction initiation setting.

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Section: Geologic Backgroundmentioning

confidence: 88%

Boninite and boninite-series volcanics in northern Zambales ophiolite: doubly vergent subduction initiation along Philippine Sea plate margins

Perez

Umino

Yumul³

et al. 2018

Solid Earth

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“…Harzburgites, dunites and clinopyroxenites similar to the San Antonio massif exposures make up the Grande island, which is located at the mouth of Subic Bay. An east-west traverse section, from the westernmost portion of the San Antonio massif to the Subic-Olongapo area defines a complete ophiolite suite which consists of an arc block (San Antonio massif) sutured to a back-arc basin crust (Subic-Olongapo sheeted dikes-pillow basalts of the Cabangan massif) (Yumul et al 1998a). The harzburgites-lherzolites are serpentinized, while dunites host massive to layered Crrich [spinel XCr > 0.60] chromitites.…”

Section: Geologymentioning

confidence: 99%

“…This leads to the conclusion that the Acoje and Coto blocks are genetically related to the San Antonio and Cabangan massifs, respectively (e.g. Yumul & Dimalanta 1997;Yumul et al 1998a).…”

Section: Masinloc Cabangan and San Antonio Massifs: Field Similaritiesmentioning

confidence: 99%

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Geology of the southern Zambales Ophiolite Complex, Luzon, Philippines

Yumul¹,

Dimalanta²,

Jumawan³

2000

Isl Arc

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Field, geochemical and geophysical evidence show that the southern Zambales Ophiolite Complex attained its present-day configuration through the juxtapositioning of an arc terrane (San Antonio massif) to a back-arc crust (Cabangan massif). The San Antonio massif manifests island arc-related characteristics (i.e. spinel XCr [Cr/(Cr + Al)] >0.60; mostly plagioclase An92-95; pyroxene crystallizing ahead of plagioclase; orthopyroxene as an early, major crystallizing phase) which cannot be directly parental to the Cabangan massif transitional mid-ocean ridge basalt to island arc tholeiitic volcanic carapace. The two massifs are believed to be separated by a left-lateral strike-slip fault, the Subic Bay Fault Zone. Apart from the presence of highly sheared, allochthonous outcrops, the Subic Bay Fault Zone is generally defined by northwest-southeast trending magnetic and bouguer anomalies. The San Antonio massif was translated southward from the northern part of the Zambales Ophiolite Complex through the Subic Bay Fault Zone. This resulted into its suturing with the Cabangan massif and could have led to the formation of the present-day Subic Bay.

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“…1b). The present disposition of Acoje Block is postulated to be the result of southward translation of San Antonio massif with respect to northern Masinloc massif (Yumul et al, 1998). Crustal thickness estimates, based on SW-NE transects of the northern Masinloc massif, are up to 9.5 km for the mantle section and 7 km for the lower crustal section.…”

Section: Geologic Backgroundmentioning

confidence: 84%

Boninite and boninite-series volcanics in northern Zambales ophiolite: Doubly-vergent subduction initiation along Philippine Sea Plate margins

Perez¹,

Umino²,

Yumul³

et al. 2018

Preprint

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Abstract.A key component of subduction initiation rock suites is boninite, a high-magnesium andesite that is uniquely predominant in Western Pacific forearc terranes and in select Tethyan ophiolites such as Oman and Troodos. We report the discovery of low-calcium, high-silica boninite in the middle Eocene Zambales ophiolite (Luzon island, Philippines). Olivine-15 orthopyroxene microphyric high-silica boninite, olivine-clinopyroxene-phyric low-silica boninite and boninitic basalt occur Paleolatitudes derived from tilt-corrected sites in the Acoje Block place the juvenile arc of northern Zambales ophiolite in 25 the western margin of the Philippine Sea Plate. In this scenario, the origin of Philippine Sea Plate boninites (IBM and Zambales) would be in a doubly-vergent subduction initiation setting.

show abstract

Translation and docking of an arc terrane: geological and geochemical evidence from the southern Zambales Ophiolite Complex, Philippines

Cited by 31 publications

References 31 publications

Boninite and boninite-series volcanics in northern Zambales ophiolite: doubly vergent subduction initiation along Philippine Sea plate margins

Boninite and boninite-series volcanics in northern Zambales ophiolite: doubly vergent subduction initiation along Philippine Sea plate margins

Geology of the southern Zambales Ophiolite Complex, Luzon, Philippines

Boninite and boninite-series volcanics in northern Zambales ophiolite: Doubly-vergent subduction initiation along Philippine Sea Plate margins

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