TY - JOUR
T1 - Slab rollback and microcontinent subduction in the evolution of the Zambales Ophiolite Complex (Philippines)
T2 - A review
AU - Yumul, Graciano P.
AU - Dimalanta, Carla B.
AU - Salapare, Ricky C.
AU - Queaño, Karlo L.
AU - Faustino-Eslava, Decibel V.
AU - Marquez, Edanjarlo J.
AU - Ramos, Noelynna T.
AU - Payot, Betchaida D.
AU - Guotana, Juan Miguel R.
AU - Gabo-Ratio, Jillian Aira S.
AU - Armada, Leo T.
AU - Padrones, Jenielyn T.
AU - Ishida, Keisuke
AU - Suzuki, Shigeyuki
PY - 2019/1/1
Y1 - 2019/1/1
N2 - New radiolarian ages show that the island arc-related Acoje block of the Zambales Ophiolite Complex is possibly of Late Jurassic to Early Cretaceous age. Radiometric dating of its plutonic and volcanic-hypabyssal rocks yielded middle Eocene ages. On the other hand, the paleontological dating of the sedimentary carapace of the transitional mid-ocean ridge – island arc affiliated Coto block of the ophiolite complex, together with isotopic age datings of its dikes and mafic cumulate rocks, also yielded Eocene ages. This offers the possibility that the Zambales Ophiolite Complex could have: (1) evolved from a Mesozoic arc (Acoje block) that split to form a Cenozoic back-arc basin (Coto block), (2) through faulting, structurally juxtaposed a Mesozoic oceanic crust with a younger Cenozoic lithospheric fragment or (3) through the interplay of slab rollback, slab break-off and, at a later time, collision with a microcontinent fragment, caused the formation of an island arc-related ophiolite block (Acoje) that migrated trench-ward resulting into the generation of a back-arc basin (Coto block) with a limited subduction signature. This Meso-Cenozoic ophiolite complex is compared with the other oceanic lithosphere fragments along the western seaboard of the Philippines in the context of their evolution in terms of their recognized environments of generation.
AB - New radiolarian ages show that the island arc-related Acoje block of the Zambales Ophiolite Complex is possibly of Late Jurassic to Early Cretaceous age. Radiometric dating of its plutonic and volcanic-hypabyssal rocks yielded middle Eocene ages. On the other hand, the paleontological dating of the sedimentary carapace of the transitional mid-ocean ridge – island arc affiliated Coto block of the ophiolite complex, together with isotopic age datings of its dikes and mafic cumulate rocks, also yielded Eocene ages. This offers the possibility that the Zambales Ophiolite Complex could have: (1) evolved from a Mesozoic arc (Acoje block) that split to form a Cenozoic back-arc basin (Coto block), (2) through faulting, structurally juxtaposed a Mesozoic oceanic crust with a younger Cenozoic lithospheric fragment or (3) through the interplay of slab rollback, slab break-off and, at a later time, collision with a microcontinent fragment, caused the formation of an island arc-related ophiolite block (Acoje) that migrated trench-ward resulting into the generation of a back-arc basin (Coto block) with a limited subduction signature. This Meso-Cenozoic ophiolite complex is compared with the other oceanic lithosphere fragments along the western seaboard of the Philippines in the context of their evolution in terms of their recognized environments of generation.
KW - Ophiolite
KW - Philippines
KW - Radiolarians
KW - Slab rollback
KW - Subduction
KW - Zambales
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U2 - 10.1016/j.gsf.2018.12.008
DO - 10.1016/j.gsf.2018.12.008
M3 - Article
AN - SCOPUS:85061796708
JO - Geoscience Frontiers
JF - Geoscience Frontiers
SN - 1674-9871
ER -