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Middle Jurassic arc reversal, Victoria–Katha Block and Sibumasu Terrane collision, jadeite formation and Western Tin Belt generation, Myanmar

Published online by Cambridge University Press:  05 April 2021

Andrew Mitchell Open the ORCID record for Andrew Mitchell [Opens in a new window] ,
Myint Thein Htay  and
Kyaw Min Htun
Andrew Mitchell*
Affiliation:
Myanmar Precious Resources Group, Room 302, Shwe Than Lwin Condominium, New University Avenue road, Aye Yeik Thar Street, Bahan Township, Yangon, Myanmar
Myint Thein Htay
Affiliation:
Myanmar Precious Resources Group, Room 302, Shwe Than Lwin Condominium, New University Avenue road, Aye Yeik Thar Street, Bahan Township, Yangon, Myanmar
Kyaw Min Htun
Affiliation:
Myanmar Precious Resources Group, Room 302, Shwe Than Lwin Condominium, New University Avenue road, Aye Yeik Thar Street, Bahan Township, Yangon, Myanmar
*
Author for correspondence: Andrew Mitchell, Email: andrewmitch999@aol.com
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Abstract

Myanmar is occupied by the N-wards continuation of the Sunda arc and by the Shan Plateau and its continuation through Yunnan into Tibet. Our new tectonic interpretation of the ophiolite–flysch belts, world-famous jadeite and tin deposits in Myanmar west of the Salween adopts previous proposals that, before 450-km post-early Oligocene dextral displacement along the Sagaing Fault, the ophiolite belt in NE Myanmar continued through the topography that is now located west of the fault in the Indo-Burman Ranges. Differences in cross-section through Mogok and the Shan Scarps are reconciled by the recently proposed emplacement, in our view during Permian time, of the Mogok Metamorphic Group onto the Slate Belt to form Sibumasu. We argue that during Early Jurassic time a Neo-Tethys ophiolite nappe was obducted over turbidites on Sibumasu’s passive western margin. Following reversal in tectonic polarity, the remaining Neo-Tethys subducted E-wards generating the 113–128 Ma Mondaung Arc. During ocean closure the Victoria–Katha Block and its Triassic flysch subducted beneath Sibumasu, resulting in jadeite veins in overlying serpentinite that ascended in the subduction zone and were exhumed at Hpakant and Nat Hmaw, bordering the Jade Mines Uplift. Subduction of the Indian Ocean since Albian time generated the Popa–Loimye arc, while extensional faulting led to uplift of the Indo-Burman Ranges and to the formation of the Western Tin Belt granites. Tectonic effects in Myanmar of the India–Asia collision may be confined to the Disang thrust belt in the Naga Hills.

Keywords

Indian OceanjadeMondaung arcNeo-Tethysophioliteorogenic flyschepithermal gold
Type
Original Article
Information
Geological Magazine , Volume 158 , Issue 8 , August 2021 , pp. 1487 - 1503
Copyright
© The Author(s), 2021. Published by Cambridge University Press

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