Cenozoic structural evolution of the Andaman Sea: Evolution from an extensional to a sheared margin
© 2016 The Author(s). Published by The Geological Society of London. The Andaman Sea is proposed to have developed from a margin where Palaeogene back-arc collapse closed a mid-Cretaceous back-arc oceanic basin, and resulted in the collision between island arc crust to the west and the western margi...
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| Format: | Book Series |
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2018
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| Online Access: | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85028299639&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/55656 |
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| Institution: | Chiang Mai University |
| Summary: | © 2016 The Author(s). Published by The Geological Society of London. The Andaman Sea is proposed to have developed from a margin where Palaeogene back-arc collapse closed a mid-Cretaceous back-arc oceanic basin, and resulted in the collision between island arc crust to the west and the western margin of Sundaland. Subsequent east- west to WNW-ESE extension during the Late Eocene-Oligocene resulted in highly extended continental crust underlying the Alcock and Sewell rises, and the East Andaman Basin, and moderately extended crust in the Megui-North Sumatra Basin. As India coupled with western Myanmar, the margin became dominated by dextral strike-slip and NNW-SSE transtensional deformation during the Miocene. The narrow belt of NNW -SSE-directed extension is proposed to have focused on the region where ductile middle crust remained following Late Eocene- Oligocene extension, whereas strike-slip faults are located in the regions of necking where ductile middle crust was considerably thinned by Late Eocene-Oligocene extension. The last phase of NNW-SSE-extension switched between probable Late Miocene-Early Pliocene seafloor spreading, and extension (by dyke intrusion and faulting) in the Alcock and Sewell rises, and then recently back to the spreading centre. |
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