Volcanic-hypabyssal rock geochemistry of a subduction-related marginal basin ophiolite: Southeast Bohol Ophiolite-Cansiwang Mélange Complex, Central Philippines

Faustino, Decibel V.; Yumul, Graciano P.; Dimalanta, Carla B.; Jesus, Joel V. De; Zhou, Mei‐Fu; Aitchison, Jonathan C.; Tamayo, Rodolfo A.

doi:10.1007/bf02910371

Cited by 15 publications

(8 citation statements)

References 51 publications

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“…This is consistent with the increasing TiO 2 and decreasing MgO and CaO contents as FeO total /MgO (fractionation index) increases (Fig. 4) (e.g., Faustino et al 2006).…”

Section: Geochemistrysupporting

confidence: 85%

“…Apart from the Oligocene Amnay Ophiolite in Mindoro which has the ocean island basalts (OIB) or enriched mid-oceanic ridge basalts (EMORB) component in addition to its transitional island arc tholeiite -N-MORB geochemistry (Jumawan et al 1998;Perez et al 2013), the general observation is that ophiolites in the central Philippines were generated with variable degrees of subduction influences (e.g., Faustino et al 2006;Dimalanta et al 2009;Yumul et al 2013). The elevated Th content and negative anomalies in Nb, Zr, and to a certain extent, Ti, are suggestive of the involvement of sediments and hydrous magmas in the generation of volcanic-hypabyssal BOC rocks (e.g., Pearce 2003;Payot et al 2011).…”

Section: Implications For Tectonic Settingsmentioning

confidence: 99%

“…From studies about SEBOC, the mix of N-MORB, E-MORB, boninitic rocks and high-magnesian andesites in the ophiolitic assemblage are taken to indicate emplacement along a forearc margin (Faustino et al 2006). The same mix of geochemical compositions has not been observed in BOC.…”

Section: Implications For Tectonic Settingsmentioning

confidence: 99%

“…(c) General comparison of lithology, age and geochemical characteristics of the ophiolites in the Central Philippines. Numbered references are as follows: (1) Rangin et al (1991), (2) Tamayo et al (2001), (3) Barretto et al (2000), (4) Faustino et al (2006), (5) Wolcke and Scholz (1988), (6) Hashimoto (1981), ( Suerte et al 2005;. The delineation of the Balud Ophiolitic Complex (BOC) in southwest Masbate, Central Philippines gives additional information that hopefully would contribute to the reconstruction and understanding of the evolution of the Philippines and this part of Southeast Asia.…”

Section: Introductionmentioning

confidence: 99%

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Geochemical and Geophysical Characteristics of the Balud Ophiolitic Complex (BOC), Masbate Island, Philippines: Implications for its Generation, Evolution and Emplacement

Manalo¹,

Dimalanta²,

Faustino-Eslava³

et al. 2015

Terr. Atmos. Ocean. Sci.

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This paper presents the first field, geochemical and geophysical information on the recently recognized Early Cretaceous Balud Ophiolitic Complex (BOC) in the island of Masbate in the Central Philippines. Mapping of the western limb of the island revealed that only the upper crustal section of the BOC is exposed in this area. Geochemically, the pillow basalts are characterized by transitional mid-oceanic ridge basalt-island arc tholeiitic compositions. Gravity surveys yielded low Bouguer anomaly values that are consistent with the highly dismembered nature of the BOC. Short wavelength, high amplitude magnetic anomalies registered across the study area are attributed to shallow magnetic sources. This is taken to support the model that the ophiolitic complex occurs as thin crustal slivers that are not deeply-rooted in the mantle. Comparing BOC with other ophiolites in the Central Philippines, such as those in the islands of Sibuyan, Leyte and Bohol, suggests the possibility of a common or contiguous source for similarly-aged and geochemically composed crust-mantle sequences in the region.

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“…This is consistent with the increasing TiO 2 and decreasing MgO and CaO contents as FeO total /MgO (fractionation index) increases (Fig. 4) (e.g., Faustino et al 2006).…”

Section: Geochemistrysupporting

confidence: 85%

Section: Implications For Tectonic Settingsmentioning

confidence: 99%

Section: Implications For Tectonic Settingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Geochemical and Geophysical Characteristics of the Balud Ophiolitic Complex (BOC), Masbate Island, Philippines: Implications for its Generation, Evolution and Emplacement

Manalo¹,

Dimalanta²,

Faustino-Eslava³

et al. 2015

Terr. Atmos. Ocean. Sci.

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show abstract

“…Amphibolite, quartz-albite-mica schist and serpentinite are mapped as metamorphic soles of these exposed oceanic lithosphere fragments. Tectonic and sedimentary mélanges are associated with ophiolite and ophiolitic suites (Yumul et al, 1997;De Jesus et al, 2000;Faustino et al, 2006). Majority of the suites are classified as Tethyan (Moores, 1982).…”

Section: Major Ophiolite Beltsmentioning

confidence: 97%

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

et al. 2008

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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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Land-ocean interaction of carbon cycle and bio-diversity change during the Cretaceous in Asia

2006

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Volcanic-hypabyssal rock geochemistry of a subduction-related marginal basin ophiolite: Southeast Bohol Ophiolite-Cansiwang Mélange Complex, Central Philippines

Cited by 15 publications

References 51 publications

Geochemical and Geophysical Characteristics of the Balud Ophiolitic Complex (BOC), Masbate Island, Philippines: Implications for its Generation, Evolution and Emplacement

Geochemical and Geophysical Characteristics of the Balud Ophiolitic Complex (BOC), Masbate Island, Philippines: Implications for its Generation, Evolution and Emplacement

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

Land-ocean interaction of carbon cycle and bio-diversity change during the Cretaceous in Asia

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