Late Oligocene - Recent stress evolution in rift basins of northern and central Thailand: Implications for escape tectonics
The Tertiary rift basins of Thailand are known through sub-surface seismic and borehole data collected for hydrocarbon and coal exploration, outcrops in open-cast coal mines, and a few natural outcrops. These data provide mixed perspectives on how the basins evolved, some providing data on ages and...
Saved in:
Main Authors: | , , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
2014
|
Online Access: | http://www.scopus.com/inward/record.url?eid=2-s2.0-0034988543&partnerID=40&md5=c133588fd0cdb2cabbab10b497d698a1 http://cmuir.cmu.ac.th/handle/6653943832/4912 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Institution: | Chiang Mai University |
Language: | English |
id |
th-cmuir.6653943832-4912 |
---|---|
record_format |
dspace |
spelling |
th-cmuir.6653943832-49122014-08-30T02:55:56Z Late Oligocene - Recent stress evolution in rift basins of northern and central Thailand: Implications for escape tectonics Morley C.K. Woganan N. Sankumarn N. Hoon T.B. Alief A. Simmons M. The Tertiary rift basins of Thailand are known through sub-surface seismic and borehole data collected for hydrocarbon and coal exploration, outcrops in open-cast coal mines, and a few natural outcrops. These data provide mixed perspectives on how the basins evolved, some providing data on ages and structural geometries, others palaeostress data. In general, the region evolved under approximately E-W extension, although the extension direction probably changed periodically within basins. Extension was episodically interrupted by inversion events associated with sub-horizontal NW-SE to NE-SW σ 1 direction. There is no evidence to suggest that the string of rift basins running from N. Thailand and Laos into the Gulf of Thailand evolved in a similar way. On the contrary, the evolution of each basin seems different, although certain regional trends along the rift system are apparent as follows: (1) Oligocene-Lower Miocene extension is widespread in the region. (2) In central and northern Thailand Middle Miocene extension is also important, and extension persisted into the Upper Miocene-Pliocene. (3) In the extreme south of the area (W. Natuna basin, Penyu basin, Malay basin) extension ceased in the earliest Miocene. (4) In the northern Gulf of Thailand extension ceased in the Middle Miocene. (5) Thermal subsidence is greatest (up to 4 km) in the south (Malay, Pattani, W. Natuna and Penyu basins) and least in northern Thailand (a few tens to hundreds of metres). (6) Inversion in the southern Gulf of Thailand was intense and occurred during the Lower and Middle Miocene. In the northern Gulf of Thailand inversion is very mild and occurred during the Lower and Middle Miocene. Onshore inversion is patchy during the Miocene, but is strongest in the northwestern rift basins (particularly the Li basin). The most widespread inversion event that affects the north occurred during the Plio-Pleistocene. It might be associated with the change from left to right lateral motion on the Red River Fault. The relationship between strike-slip faults and rift basins in terms of timing of extensional and inversion events, and palaeostress orientation and evolution is more complex than can be explained by simple escape tectonic models. © 2001 Elsevier Science B.V. All rights reserved. 2014-08-30T02:55:56Z 2014-08-30T02:55:56Z 2001 Article 00401951 10.1016/S0040-1951(00)00300-0 http://www.scopus.com/inward/record.url?eid=2-s2.0-0034988543&partnerID=40&md5=c133588fd0cdb2cabbab10b497d698a1 http://cmuir.cmu.ac.th/handle/6653943832/4912 English |
institution |
Chiang Mai University |
building |
Chiang Mai University Library |
country |
Thailand |
collection |
CMU Intellectual Repository |
language |
English |
description |
The Tertiary rift basins of Thailand are known through sub-surface seismic and borehole data collected for hydrocarbon and coal exploration, outcrops in open-cast coal mines, and a few natural outcrops. These data provide mixed perspectives on how the basins evolved, some providing data on ages and structural geometries, others palaeostress data. In general, the region evolved under approximately E-W extension, although the extension direction probably changed periodically within basins. Extension was episodically interrupted by inversion events associated with sub-horizontal NW-SE to NE-SW σ 1 direction. There is no evidence to suggest that the string of rift basins running from N. Thailand and Laos into the Gulf of Thailand evolved in a similar way. On the contrary, the evolution of each basin seems different, although certain regional trends along the rift system are apparent as follows: (1) Oligocene-Lower Miocene extension is widespread in the region. (2) In central and northern Thailand Middle Miocene extension is also important, and extension persisted into the Upper Miocene-Pliocene. (3) In the extreme south of the area (W. Natuna basin, Penyu basin, Malay basin) extension ceased in the earliest Miocene. (4) In the northern Gulf of Thailand extension ceased in the Middle Miocene. (5) Thermal subsidence is greatest (up to 4 km) in the south (Malay, Pattani, W. Natuna and Penyu basins) and least in northern Thailand (a few tens to hundreds of metres). (6) Inversion in the southern Gulf of Thailand was intense and occurred during the Lower and Middle Miocene. In the northern Gulf of Thailand inversion is very mild and occurred during the Lower and Middle Miocene. Onshore inversion is patchy during the Miocene, but is strongest in the northwestern rift basins (particularly the Li basin). The most widespread inversion event that affects the north occurred during the Plio-Pleistocene. It might be associated with the change from left to right lateral motion on the Red River Fault. The relationship between strike-slip faults and rift basins in terms of timing of extensional and inversion events, and palaeostress orientation and evolution is more complex than can be explained by simple escape tectonic models. © 2001 Elsevier Science B.V. All rights reserved. |
format |
Article |
author |
Morley C.K. Woganan N. Sankumarn N. Hoon T.B. Alief A. Simmons M. |
spellingShingle |
Morley C.K. Woganan N. Sankumarn N. Hoon T.B. Alief A. Simmons M. Late Oligocene - Recent stress evolution in rift basins of northern and central Thailand: Implications for escape tectonics |
author_facet |
Morley C.K. Woganan N. Sankumarn N. Hoon T.B. Alief A. Simmons M. |
author_sort |
Morley C.K. |
title |
Late Oligocene - Recent stress evolution in rift basins of northern and central Thailand: Implications for escape tectonics |
title_short |
Late Oligocene - Recent stress evolution in rift basins of northern and central Thailand: Implications for escape tectonics |
title_full |
Late Oligocene - Recent stress evolution in rift basins of northern and central Thailand: Implications for escape tectonics |
title_fullStr |
Late Oligocene - Recent stress evolution in rift basins of northern and central Thailand: Implications for escape tectonics |
title_full_unstemmed |
Late Oligocene - Recent stress evolution in rift basins of northern and central Thailand: Implications for escape tectonics |
title_sort |
late oligocene - recent stress evolution in rift basins of northern and central thailand: implications for escape tectonics |
publishDate |
2014 |
url |
http://www.scopus.com/inward/record.url?eid=2-s2.0-0034988543&partnerID=40&md5=c133588fd0cdb2cabbab10b497d698a1 http://cmuir.cmu.ac.th/handle/6653943832/4912 |
_version_ |
1681420326223740928 |