The Timing of Collision Between Asia and the West Burma Terrane, and the Development of the Indo?Burman Ranges

The West Burma Terrane (WBT) is a small terrane bounded to the east by Asian Sibumasu Block and west Indo-Burman Ranges (IBR), latter being an exhumed accretionary prism that formed during subduction of Indian oceanic lithosphere beneath Asia. Understanding geological history WBT important for reconstruction closure Tethys ocean India-Asia collision. Currently there are major discrepancies in proposed timings collision between with both India Asia; whether collided or Asia first debated, collisions stretch from Mesozoic Cenozoic. We undertook multi-technique provenance study involving petrography, detrital zircon U-Pb Hf analyses, rutile analyses Sr-Nd bulk rock on sediments Central Myanmar Basins (CMB) WBT. determined arrival material into basin occurred after earliest late Eocene early Oligocene, thus placing minimum constraint timing WBT-Asia Our low temperature thermochronological IBR record two periods exhumation, early-middle Eocene, at Oligo-Miocene boundary. event may be associated India. later boundary changes wedge dynamics resulting increased sediment supply system; however number other possible causes provide equally plausible explanations events.