RT Journal Article T1 Low-K Tholeiitic Signatures in Calayan Island (Northern Luzon, Philippines) A1 Pendón, R. R. A1 Corretgé Castañón, Luis Guillermo A1 Ordaz, Jorge AB 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 PB Sociedad Geológica de España YR 2000 FD 2000 LK http://hdl.handle.net/10272/9796 UL http://hdl.handle.net/10272/9796 LA eng DS Repositorio Institucional de la Universidad de Huelva RD 1 jun 2026