Abstract
The Central Cordillera in northern Philippines is underlain mainly by ophiolitic basement of Cretaceous to Eocene age. In the central portion of the range, these complexes consist mainly of pillow basalt and basaltic feeder dikes that are unconformably overlain by epiclastic rocks, including turbidites. Field and geochemical evidence reveals that these rocks have a supra-subduction signature, and were generated in a back-arc setting. These relationships are similar to those exhibited by the Cretaceous to Eocene Lepanto Metavolcanics and the Pugo Formation, comprising the ophiolitic basement in the southern portions of the range. This result suggests that the Central Cordillera is floored by a common volcanic basement, possibly forming part of the Philippine Sea plate, proto-Philippine Sea plate, or proto-Molucca Sea plate.
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