Age, depositional history and tectonics of the Indo-Myanmar Ranges, Myanmar

Naing, Tin Tin; Robinson, S.A.; Searle, M.P.; Morley, C.K.; Millar, I.; Green, O.R.; Bown, P.R.; Danelian, T.; Petrizzo, M.R.; Henderson, G.M.. 2023 Age, depositional history and tectonics of the Indo-Myanmar Ranges, Myanmar. Journal of the Geological Society, 180 (5), jgs2022-091. 10.1144/jgs2022-091

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Abstract/Summary

The Indo-Myanmar Ranges (IMR) are an enigmatic mountain belt that occupy a complex tectonic zone in western Myanmar extending from the northern continuation of the active Sunda-Andaman arc into the eastern Himalayan syntaxis. The IMR are part of an accretionary fore-arc basin-arc complex that includes the Central Myanmar Basin and the Wuntho-Popa Arc to the east. New biostratigraphic, petrologic, and detrital zircon U-Pb age data are presented that are used to test and refine the divergent tectonic models that have been proposed for western Myanmar. These data suggest: 1) that the Upper Triassic Pane Chaung Formation was originally deposited adjacent to the NE Indian continental margin within northern Gondwana during the Late Triassic, and 2) that the Upper Cretaceous – Paleogene rocks of the IBR were mainly derived from the Wuntho-Popa Arc and Inner Belt, with a subordinate input from a crustal source, potentially from the Naga metamorphic-type Paleozoic basement. The Kalemyo ophiolite has an Early Cretaceous age similar to ages of ophiolites in the Indus Yarlung-Tsangpo suture zone, south Tibet and Nagaland, reinforcing the hypothesis that they were once part of the same Neo-Tethyan ocean floor.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1144/jgs2022-091
ISSN:	0016-7649
Date made live:	23 Jun 2023 14:22 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/535057

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