The Man Who Made Impact – The Scientific Work of Dr Sangad Bunopas
Keywords:
biography, cometary impact, loess, Quaternary stratigraphy, Shan-Thai Terrane, tectonics, ThailandAbstract
Sangad Bunopas published extensively on the geology of Thailand and left a legacy of maps, reports, stratigraphic nomenclature and insightful papers covering most of the kingdom. His 1981 PhD thesis published in 1982 laid the foundation of modern Thai stratigraphy. His highly cited papers on the tectonics of South East Asia, often with Professor Paul Vella, were based on Sangad’s extraordinary first-hand knowledge of Thai geology which allowed him to draw the first reliable tectonic subdivisions of the whole country. Although controversial at the time, these tectonic subdivisions and hypotheses have since been accepted as generally correct in that the Shan-Thai Terrane (as part of Sibumasu) rifted from Australian crust in the early Permian, drifted and warmed as it crossed the Palaeotethyan Ocean and collided with the Indochina Terrane in the late Triassic. His stimulating palaeomagnetically constrained, combined palinspastic-palaeogeographic maps for the Permian to Cenozoic were well in advance at the time and have not been attempted again in the subsequent 40 years.
His controversial later work, which attempted to explain the widespread, anomalous loess in northeast Thailand, the Australasian tektite strewn field, the fluvial deposits in Nakhon Ratchasima (Khorat) Province and their middle Pleistocene faunas and flora as the result of a cometary impact at 788 ka has received some support and some criticism but has nevertheless stimulated a considerable research and a lot of discussion.
Over more than 50 years, Sangad made many major contributions to Thai geology, South East Asian tectonics and meteoritic research. His wit, wisdom and iconoclastic approach to earth and planetary science will be sorely missed by his numerous friends and colleagues.
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