Geometrical problems and implications of large scale over-thrusting in the Banda Arc -Australian margin collision zone

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Abstract
Inversion of stratigraphical sequences, the presence of high grade metamorphic rocks sitting on serpentinite rafts bounded by unmetamorphosed sedimentary rocks, and zones of imbrication have been cited as evidence of large scale overthrusting in the Outer Banda Arc. Earthquake data reveal a Benioff zone implying intermediate depth and deep focus underthrusting beneath the Banda Arc but there is a paucity of shallow focus shocks with underthrusting mechanisms. Multichannel seismic reflection surfeys between the Outer Banda Arc and the Australian-New Guinea shelf have been interpreted as showing imbrication in the north wall of the Timor Trough and the S wall of the Seram Trough. Quaternary steep angled block faulting post-dates and thus obscures much of the thrust faulting in the Banda Arc.