Slab rollback and microcontinent subduction in the evolution of the Zambales Ophiolite Complex(Philippines):A review |
| |
| Authors: | Graciano PYumul Jr Carla BDimalanta Ricky CSalapare Karlo LQueano Decibel VFaustino-Eslava Edanjarlo JMarquez Noelynna TRamos Betchaida DPayot Juan Miguel RGuotana Jillian Aira SGabo-Ratio Leo TArmada Jenielyn TPadrones Keisuke Ishida Shigeyuki Suzuki |
| |
| Institution: | Apex Mining Company Inc.;Rushurgent Working Group;GHD;Department of Environmental Science;School of Environmental Science and Management;Department of Physical Sciences and Mathematics;Graduate School of Natural Science and Technology;Institute of Renewable Natural Resources;Institute of Socio-Arts and Sciences;Department of Earth Sciences |
| |
| Abstract: | 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 volcanichypabyssal 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 |
| 本文献已被 CNKI 维普 ScienceDirect 等数据库收录！ |
| 点击此处可从《地学前缘(英文版)》浏览原始摘要信息 |
| 点击此处可从《地学前缘(英文版)》下载免费的PDF全文 |
