Tectonic, diapiric and sedimentary chaotic rocks of the Rakhine coast, western Myanmar
The western margin of Myanmar is the northern extension the active Sunda (India-Eurasia) subduction zone. Coastal regions and offshore islands have remarkable exposures of chaotic rock terranes along wave-cut terraces that allow characteristics of tectonic, sedimentary and diapiric mélanges to be re...
| Main Authors: | , , , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2021
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| Online Access: | https://hdl.handle.net/10356/147118 |
| _version_ | 1811683455659933696 |
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| author | Moore, G. F. Aung, Lin Thu Fukuchi, R. Sample, J. C. Hellebrand, E. Kopf, A. Naing, Win Than, Win Min Tun, Tin Naing |
| author2 | Earth Observatory of Singapore |
| author_facet | Earth Observatory of Singapore Moore, G. F. Aung, Lin Thu Fukuchi, R. Sample, J. C. Hellebrand, E. Kopf, A. Naing, Win Than, Win Min Tun, Tin Naing |
| author_sort | Moore, G. F. |
| collection | NTU |
| description | The western margin of Myanmar is the northern extension the active Sunda (India-Eurasia) subduction zone. Coastal regions and offshore islands have remarkable exposures of chaotic rock terranes along wave-cut terraces that allow characteristics of tectonic, sedimentary and diapiric mélanges to be recognized. Tectonic shear zones (tectonic mélanges) contain fragments of Cretaceous ophiolites (chrome-spinel-bearing peridotites and radiolarian cherts) that are in contact with thrust packets of Eocene turbidite units (broken formations). The turbidites contain shale-rich beds that have been sheared during soft-sediment deformation (sedimentary broken formations) and are sandwiched between undeformed thick sandy beds. These are mass transport deposits (MTDs) that most likely formed during deposition of the initial detritus of the Himalayan orogenic zone, probably trench slope basins on the accretionary prism. The ophiolitic and turbiditic thrust slices have been exhumed and are currently being intruded by active mud volcanoes that bring fragments of units up from depth to the surface, forming diapiric mélanges. These diapiric mélange bodies contain only small fragments (<50 cm) that are randomly oriented and do not exhibit shear fabrics. Because the region lacks superimposed deformation characteristic of most orogenic belts, the origins of all three rock bodies can easily be distinguished. |
| first_indexed | 2024-10-01T04:13:01Z |
| format | Journal Article |
| id | ntu-10356/147118 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:13:01Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1471182021-03-23T05:24:14Z Tectonic, diapiric and sedimentary chaotic rocks of the Rakhine coast, western Myanmar Moore, G. F. Aung, Lin Thu Fukuchi, R. Sample, J. C. Hellebrand, E. Kopf, A. Naing, Win Than, Win Min Tun, Tin Naing Earth Observatory of Singapore Social sciences::Geography::Physical geography Myanmar Tectonics Rakhine Coast The western margin of Myanmar is the northern extension the active Sunda (India-Eurasia) subduction zone. Coastal regions and offshore islands have remarkable exposures of chaotic rock terranes along wave-cut terraces that allow characteristics of tectonic, sedimentary and diapiric mélanges to be recognized. Tectonic shear zones (tectonic mélanges) contain fragments of Cretaceous ophiolites (chrome-spinel-bearing peridotites and radiolarian cherts) that are in contact with thrust packets of Eocene turbidite units (broken formations). The turbidites contain shale-rich beds that have been sheared during soft-sediment deformation (sedimentary broken formations) and are sandwiched between undeformed thick sandy beds. These are mass transport deposits (MTDs) that most likely formed during deposition of the initial detritus of the Himalayan orogenic zone, probably trench slope basins on the accretionary prism. The ophiolitic and turbiditic thrust slices have been exhumed and are currently being intruded by active mud volcanoes that bring fragments of units up from depth to the surface, forming diapiric mélanges. These diapiric mélange bodies contain only small fragments (<50 cm) that are randomly oriented and do not exhibit shear fabrics. Because the region lacks superimposed deformation characteristic of most orogenic belts, the origins of all three rock bodies can easily be distinguished. Partially funded by US National Science Foundation Grant #OCE-1260718. SOEST contribution # 10634. 2021-03-23T05:24:14Z 2021-03-23T05:24:14Z 2019 Journal Article Moore, G. F., Aung, L. T., Fukuchi, R., Sample, J. C., Hellebrand, E., Kopf, A., Naing, W., Than, W. M. & Tun, T. N. (2019). Tectonic, diapiric and sedimentary chaotic rocks of the Rakhine coast, western Myanmar. Gondwana Research, 74, 126-143. https://dx.doi.org/10.1016/j.gr.2019.04.006 1342-937X https://hdl.handle.net/10356/147118 10.1016/j.gr.2019.04.006 2-s2.0-85064929055 74 126 143 en Gondwana Research © 2019 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved. . |
| spellingShingle | Social sciences::Geography::Physical geography Myanmar Tectonics Rakhine Coast Moore, G. F. Aung, Lin Thu Fukuchi, R. Sample, J. C. Hellebrand, E. Kopf, A. Naing, Win Than, Win Min Tun, Tin Naing Tectonic, diapiric and sedimentary chaotic rocks of the Rakhine coast, western Myanmar |
| title | Tectonic, diapiric and sedimentary chaotic rocks of the Rakhine coast, western Myanmar |
| title_full | Tectonic, diapiric and sedimentary chaotic rocks of the Rakhine coast, western Myanmar |
| title_fullStr | Tectonic, diapiric and sedimentary chaotic rocks of the Rakhine coast, western Myanmar |
| title_full_unstemmed | Tectonic, diapiric and sedimentary chaotic rocks of the Rakhine coast, western Myanmar |
| title_short | Tectonic, diapiric and sedimentary chaotic rocks of the Rakhine coast, western Myanmar |
| title_sort | tectonic diapiric and sedimentary chaotic rocks of the rakhine coast western myanmar |
| topic | Social sciences::Geography::Physical geography Myanmar Tectonics Rakhine Coast |
| url | https://hdl.handle.net/10356/147118 |
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