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Tectonic implications of the Nan suture zone and its relationship to the Sukhothai Fold Belt, northern Thailand

journal contribution
posted on 2023-05-16, 12:39 authored by Singharajwarapan, S, Ronald BerryRonald Berry
The Nan Suture and the Sukhothai Fold Belt reflect the processes associated with the collision between the Shan-Thai and Indochina Terranes in southeast Asia. The Shan-Thai Terrane rifted from Gondwana in the Early Permian. As it drifted north a subduction complex developed along its northern margin. The Nan serpentinitic melange is a thrust slice within the Pha Som Metamorphic Complex and in total this unit is a Late Permian accretionary complex containing offscraped blocks from subducted oceanic crust of Carboniferous and Permian age. The deformational style within the Pha Som Metamorphic Complex supports a west-dipping subduction zone. The Late Permian to Late Triassic fore-arc basin sediments are preserved in the Sukhothai Fold Belt and include a near continuous sedimentary record, at least locally. The whole sequence was folded and complexly thrust in the Late Triassic as a result of the collision. Late syn- to post-kinematic granites place an upper limit of 200 Ma on the time of collision. Post-orogenic sediments prograded across the suture in the Jurassic. (C) 2000 Elsevier Science Ltd. All rights reserved.

History

Publication title

Journal of Asian Earth Sciences

Volume

18

Issue

6

Pagination

663-673

ISSN

1367-9120

Department/School

School of Natural Sciences

Publisher

Pergamon

Place of publication

Oxford, England

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the earth sciences

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