Slab rollback and microcontinent subduction in the evolution of the Zambales Ophiolite Complex (Philippines): A review
| Autor: | Shigeyuki Suzuki, Graciano P. Yumul, Decibel V. Faustino-Eslava, Jillian Aira S. Gabo-Ratio, Karlo L. Queaño, Edanjarlo J. Marquez, Leo T. Armada, Keisuke Ishida, Juan Miguel Guotana, Ricky C. Salapare, Betchaida D. Payot, Noelynna T. Ramos, Carla B. Dimalanta, Jenielyn T. Padrones |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Slab rollback
010504 meteorology & atmospheric sciences Subduction Philippines lcsh:QE1-996.5 Ophiolite Radiolarians 010502 geochemistry & geophysics 01 natural sciences Cretaceous lcsh:Geology Paleontology Zambales Oceanic crust General Earth and Planetary Sciences Island arc Radiometric dating Mafic Cenozoic Geology 0105 earth and related environmental sciences |
| Zdroj: | Geoscience Frontiers, Vol 11, Iss 1, Pp 23-36 (2020) |
| ISSN: | 1674-9871 |
| Popis: | 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. Keywords: Ophiolite, Slab rollback, Radiolarians, Subduction, Zambales, Philippines |
| Databáze: | OpenAIRE |
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