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Geological Society, London, Special Publications; 1994; v. 81; p. 77-93;
DOI: 10.1144/GSL.SP.1994.081.01.05
© 1994 Geological Society of London

Oceanic Arc Systems

Basaltic volcanism associated with extensional tectonics in the Taiwan-Luzon island arc: evidence for non-depleted sources and subduction zone enrichment

Ulrich Knittel1,2 & Oles Dietmar2,3

1 Department of Geology, University of Melbourne, Parkville, Victoria 3052, Australia
2 Institut für Mineralogie und Lagerstättenlehre, Wüllnerstr. 2, D-52056 Aachen, Germany
3 Departamento de Geologia, Universidade Eduardo Mondlane, Caixa Postal 257, Maputo, Mozambique

Primitive basalts were erupted from more than 100 monogenetic eruption centres within the Macolod Corridor, an extensional structure which cross-cuts the Taiwan-Luzon volcanic arc. The composition of early phenocrysts, HFSE systematics and relatively high Al2O3, TiO2 and Na2O contents of these rocks suggest that they are derived from sources comparable to the sources of MORB and back-arc basin basalts. This is in contrast to many other arc magmas which appear to be derived from more depleted sources. High LILE abundances and high LILE/HFSE ratios indicate the presence of slab-derived components in the magmas, although the Macolod Corridor is no longer underlain by an actively subducting slab.