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Spatial and temporal trends in exhumation of the Eastern Himalaya and syntaxis as determined from a multi-technique detrital thermochronological study of the Bengal Fan

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<mark>Journal publication date</mark>1/09/2019
<mark>Journal</mark>Geological Society of America Bulletin
Issue number9-10
Number of pages16
Pages (from-to)1607-1622
Publication StatusPublished
Early online date29/03/19
<mark>Original language</mark>English


The Bengal Fan provides a Neogene record of Eastern and Central Himalaya exhumation. We provide the first detrital thermochronological study (apatite and rutile U-Pb, mica Ar-Ar, zircon fission track) of sediment samples collected during International Ocean Discovery Program (IODP) Expedition 354 to the mid-Bengal Fan. Our data from rutile and zircon fission-track thermochronometry show a shift in lag times over the interval 5.59-3.47 Ma. The oldest sample with a lag time of 6 m.y.) has a depositional age of 5.594.50 Ma, and the zircon and rutile populations then show a static peak until >12 Ma. This interval, from 5.59-4.50 Ma to >12 Ma, is most easily interpreted as recording passive erosion of the Greater Himalaya. However, single grains with lag times of