Dolerites of the Woodlark Basin (Papuan Peninsula, New Guinea): A geochemical record of the influence of a neighbouring subduction zone

Back-arc basin origin for the basalts of the South Andaman Island Ophiolite (India)

“…LILEs such as Ba, Rb, Sr and K and many major oxides such as K 2 O, Na 2 O, FeO is commonly mobilized during alteration (e.g., Pearce and Norry, 1979) and their abundances in altered rocks are usually different than in fresh magmatic rocks (Humphris and Thompson, 1978). However, post-magmatic processes barely alter the REE and HFSE abundances in rocks and are therefore considered to be immobile during hydrothermal alteration (Winchester and Floyd, 1977;Humphris, 1984;Gardien et al, 2008;Ordóñez Calderón et al, 2008). Since the REEs and HFSEs show limited mobility in our samples, we use these elements for the tectono-magmatic interpretations of extrusives of the South Andaman Island Ophiolite suite.…”

The contribution of the young Cretaceous Caribbean Oceanic Plateau to the genesis of late Cretaceous arc magmatism in the Cordillera Occidental of Ecuador

“…Such a geodynamic 0895-9811/$ -see front matter Ó 2008 Elsevier Ltd. All rights reserved. doi:10.1016/j.jsames.2008.06.003 rarity can be illustrated by the Plio-Quaternary arc of the Solomon Islands caused by the subduction of the young and hot Woodlark Basin below the Cretaceous Ontong Java Oceanic Plateau and accreted to the Vityaz Arc 10 Ma ago (Ramsay et al, 1984;Petterson et al, 1997Petterson et al, , 1999Yoneshima et al, 2005;Gardien et al, 2008). Another example is the Late Cretaceous to Paleogene arcs established on the Caribbean-Colombian Oceanic Plateau (CCOP, 92-88 Ma, Sinton et al, 1998) accreted to the Ecuadorian margin from Campanian to Paleogene times (%75-58 Ma).…”