These fans were subsequently covered by basin and slope sediments derived from the evolving magmatic arc. Submarine fan deposition on the arcward side of the evolving accretionary prism represents the first phase in forearc basin deposition.
From the early to late Miocene, the Sumba and Savu forearc sectors along the eastern Sunda Arc may have been characterized by forearc extension. The late Oligocene increase in convergence between the South-east Asian and Indian Plates associated with a new pulse of subduction, resulted in basement uplift and the formation of a regional unconformity that can be recognized along the entire Sunda Arc. The present forearc basin configuration along the Sunda Arc initially appears to have been controlled by extension and differential subsidence of basement blocks in response to the late Eocene collision of India with Asia. Variation in forearc basin development along the Sunda Arc, Indonesia This thesis presents the results of a detailed trace element and isotope geochemistry study into the magma-genesis ofvolcanoes in the Adonara-Pantar Section (APS) ofthe East Sunda Arc in Indonesia, a setting where an oceanic island arc is colliding with a passive continental margin.
Magma genesis and slab-wedge interaction across an island arc-continent collision zone, East Sunda Arc, Indonesia
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