Journal article

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

Kim S Ely, Mike Sandiford, Margaret L Hawke, David Phillips, Mark Quigley, Joao Edmundo dos Reis

JOURNAL OF ASIAN EARTH SCIENCES | PERGAMON-ELSEVIER SCIENCE LTD | Published : 2011

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..

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Grants

Funding Acknowledgements

Field work on Atauro was made possible with the assistance of the National Directorate for Geology and Minerals, Timor-Leste. Thanks to Katherine Harper and Daniel Ervin for their contributions to the field mapping project. Detailed reviews by Tim Charlton and Ron Harris were very helpful in sharpening the focus of the manuscript. KE acknowledges the support of a CSIRO Postgraduate Award and the David Hay Postgraduate Writing-Up Award.