Evolution of Atauro Island: Temporal constraints on subduction processes beneath the Wetar zone, Banda Arc

Abstract

Ataúro is a key to understanding the late stage volcanic and subduction history of the Banda Arc to the north of Timor. A volcanic history of bi-modal subaqueous volcanism has been established and new whole rock and trace element geochemical data show two compositional groups, basaltic andesite and dacite-rhyolite. 40Ar/39Ar geochronology of hornblende from rhyo-dacitic lavas confirms that volcanism continued until 3.3Ma. Following the cessation of volcanism, coral reef marine terraces have been uplifted to elevations of 700m above sea level. Continuity of the terraces at constant elevations around the island reflects regional-scale uplift most likely linked to sublithospheric processes such..