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Original Article |
1 Department of Environmental Science, Lancaster University, Lancaster LA1 4YQ, UK (e-mail: r.allen1{at}lancaster.ac.uk)
2 Research School of Earth Sciences, Birkbeck and University College London, Gower Street, London WC1E 6BT, UK
3 Argon Isotope Laboratory, SUERC, East Kilbride, G75 0QF, UK
4 Department of Earth Sciences, Cambridge University, Downing Street, Cambridge CB2 3EQ, UK
5 Dipartimento di Scienze Geologiche e Geotecnologie, Universita Milano–Bicocca, Piazza della Scienza 4, 20126 Milano, Italy
6 NIGL, BGS Keyworth, Nottingham NG12 5GG, UK
7 Department of Geology, Leicester University, Leicester LE1 7RH, UK
The Indo-Burman Ranges in western Myanmar extend along the Sunda Arc subduction zone and may be divided into a western portion of Neogene sedimentary rocks and an eastern portion of Palaeogene sedimentary rocks, separated by the Kaladan Fault. Both Himalayan and Burman sources have been proposed for these sediments. Our thermochronological analyses on detrital grains, isotopic analyses on bulk rock, and petrographic and heavy mineral data indicate that the Palaeogene Indo-Burman Ranges contain a significant component of arc-derived material, interpreted as derived from the Burmese portion of the Mesozoic–Tertiary arc to the east. And older crustal component is also identifiable, which may have been sourced from the Himalaya or the Burmese margin. By contrast, the Neogene Indo-Burman Ranges show dominant derivation from the Himalaya. A minor arc-derived component may have been sourced from the Trans-Himalaya, or recycled from the arc-derived Paleogene Indo-Burman Ranges.
