Skip to Main Content
Book Chapter

Regional tectonics, structure and evolution of the Andaman–Nicobar Islands from ophiolite formation and obduction to collision and back-arc spreading

By
Chris K. Morley
Chris K. Morley
1
Department of Geological Sciences, Chiang Mai University, 293 Huay Kaew Road, Chiang Mai, 50200, Thailand
Search for other works by this author on:
;
Mike Searle
Mike Searle
2
Department of Earth Sciences, University of Oxford, Oxford OX1 3AN, UK
Search for other works by this author on:
Published:
January 01, 2017

Abstract

A wide range of tectonic models exist for the Cretaceous–Cenozoic development of the Sumatra–Andaman–Myanmar region, reflecting outstanding regional issues including: (1) suture zone correlation between Tibet and Myanmar; (2) understanding ophiolitic fragment emplacement; (3) timing of ophiolite emplacement; (4) tectonic setting of ophiolite formation; (5) post-emplacement ophiolite history; (6) number, distribution and accretion timing of different tectonic continental blocks in western SE Asia; (7) how the Andaman–Sumatra subduction zone developed during the Cenozoic, and location and timing of inactive, v. obliquely subducting segments; and (8) considerable variations in regional plate tectonic reconstructions (e.g. latitude of Lhasa Block at the time of collision, amount and direction of block rotation within SE Asia). Following reviews of these issues we propose a relatively simple model whose characteristics are continuity of a single continental mass between Myanmar and Sumatra during the Cenozoic, early Cenozoic ophiolite emplacement as imbricate slices within an accretionary complex and no emplacement of a major overthrusting oceanic slab. Subsequent collisional deformation further dismembered the ophiolites. Approximately 30° clockwise rotation of SE Asia occurred following Asia–India collision, accompanied by transition from a paired Andean-type magmatic belt to regional oblique-slip and strike-slip tectonics. During the Neogene the Andaman sea region became dominantly transtensional, while Myanmar in the Late Neogene became transpressional.

You do not currently have access to this article.

Figures & Tables

Contents

Geological Society, London, Memoirs

The Andaman–Nicobar Accretionary Ridge: Geology, Tectonics and Hazards

P. C. Bandopadhyay
P. C. Bandopadhyay
University of Calcutta, India
Search for other works by this author on:
;
A. Carter
A. Carter
Birkbeck University of London, UK
Search for other works by this author on:
Geological Society of London
Volume
47
ISBN electronic:
9781786203007
Publication date:
January 01, 2017

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal