Abstract
Abstract Provenance analysis using whole-rock geochemical data was carried out on the Late Oligocene to Early Miocene Zigzag Formation in southwestern Mountain Province, North Luzon, Philippines. Major and trace element geochemistry of the siliciclastic samples from the Zigzag Formation revealed a first-cycle mafic source of the detrital materials. This is consistent with other discrimination diagrams such as those using La, Sc, and Th to determine the provenance. Tectonic discrimination diagrams suggest an oceanic island arc signature for the source rocks of the Zigzag Formation. The Cretaceous to Eocene Lepanto Metavolcanics is proposed to be the source of the detrital materials comprising this clastic sequence. The results present additional information on the current understanding of the evolution of the Central Cordillera.
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