Low-K Tholeiitic Signatures in Calayan Island (Northern Luzon, Philippines)

Abstract

The Calayan island is a Tertiary (7-4 Ma) volcanic island situated in the northern portion of the Philippine archipelago, a part of Babuyan segment of the Luzon arc. It is a product of subduction of South China Sea oceanic crust underneath the Philippine terrane. Rock spectrum in the island ranges from basalt to rhyolite with andesite as the most predominating lava. Geochemical signatures are characterized by low concentrations of large-ion lithophile and flat behavior of rare-earth elements, a significant type of low-K tholeiitic series. The objective of this preliminary investigation is to determine the geochemical affinities of the island and its brief correlation to the nearby island of Camiguin de Babuyanes