Paleomagnetic results from Thailand and Myanmar: implications for the interpretation of tectonic rotations in Southeast Asia

Richter, Bryan; Fuller, M.; Schmidtke, E.; Myint, U. Tin; Win, U. Mya; Bunopas, Sangad

doi:10.1016/0743-9547(93)90026-l

Cited by 15 publications

(7 citation statements)

References 19 publications

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“…The basin belongs to the Indochina block, which is thought to have moved and rotated during the Paleogene in response to India–Eurasia collision (Chen et al. 1993; Ritcher et al. 1993; Charusiri et al.…”

Section: Methodsmentioning

confidence: 99%

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‘Thailand was a desert' during the mid‐Cretaceous: Equatorward shift of the subtropical high‐pressure belt indicated by eolian deposits (Phu Thok Formation) in the Khorat Basin, northeastern Thailand

Hasegawa

Imsamut²,

Charusiri³

et al. 2010

Island Arc

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The Tibetan Plateau is a key factor in controlling the present-day climate and atmospheric circulation pattern in Asia. The pattern of atmospheric circulation after the uplift of the plateau is well known, whereas direct evidence is lacking regarding the nature of the circulation pattern prior to the uplift. The distribution of desert directly reflects the position of the subtropical high-pressure belt, and the prevailing surface-wind pattern recorded in desert deposits reveals the position of its divergence axis. Cretaceous eolian sandstone of the Phu Thok Formation is extensively exposed in the northern Khorat Basin, northeastern Thailand. We conducted a sedimentological study on this formation to reconstruct temporal changes in the latitude of the subtropical high-pressure belt in low-latitude Asia during the Cretaceous. Spatio-temporal changes in the paleo-wind directions recorded in the Phu Thok Formation reveal that the Khorat Basin mainly belonged to the northeast trade wind belt and subtropical high-pressure belt was situated to the north of the Khorat Basin during the initial stages of deposition, shifted southward to immediately above the basin during the main phase of deposition, and then shifted northward again to the north of the basin during the final stages of deposition. The paleomagnetic polarity sequence obtained for the Phu Thok Formation comprises three zones of normal polarity and two of reversed polarity, correlating to chrons M1n to C34n of the geomagnetic polarity time scale. This result suggests that the Phu Thok Formation is mid-Cretaceous in age (from c. 126 Ma to c. 99-93 Ma), similar to the age of eolian sandstone in the Sichuan Basin, southern China (the Jiaguan Formation). These results, in combination with paleo-wind direction data, suggest the development of low-latitude desert and an equatorward shift of the subtropical high-pressure belt (relative to the present-day) in Asia during the midCretaceous.

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Section: Methodsmentioning

confidence: 99%

“…1). The basin belongs to the Indochina block, which is thought to have moved and rotated during the Paleogene in response to India-Eurasia collision (Chen et al 1993;Ritcher et al 1993;Charusiri et al 2006). The paleoposition of the Indochina block during the Cretaceous remains a point of controversy.…”

Section: Geologic and Stratigraphic Settingmentioning

confidence: 99%

‘Thailand was a desert' during the mid‐Cretaceous: Equatorward shift of the subtropical high‐pressure belt indicated by eolian deposits (Phu Thok Formation) in the Khorat Basin, northeastern Thailand

Hasegawa

Imsamut²,

Charusiri³

et al. 2010

Island Arc

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“…Richter et al (1993) and Richter and Fuller (1996) reported CW rotation of the Shan Plateau between Late Cretaceous and Late Oligocene, but Richter et al (1999) reported 30-408 CCW rotation of peninsular Malaysia between late Eocene and late Miocene. The consensus of opinion based on tectonic considerations, however, is that CW rotation of the western Sunda Arc, the Burma Block to southwestern Sumatra, occurred during the Tertiary (e.g.…”

Section: Tectonic History Of the Andaman Seamentioning

confidence: 96%

Tectonics and history of the Andaman Sea region

Curray

2005

Journal of Asian Earth Sciences

579

529

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“…In Myanmar and Thailand, many longitudinal strike-slip faults were studied, especially the Shan Scarp Fault. The faults are almost oriented in a N-S direction (Mitchell, 1992;Richter et al, 1993;Bertrand and Rangin, 2003), but their seaward extension into the East Basin is not exactly known (Curray, 2005). In addition, the Mergui Faults could have cut off the southern ends of the Ranong and the Klong Marui Fault and may have crossed the Mergui Ridge.…”

Section: Geological Setting Of the Andaman Seamentioning

confidence: 95%

“…(b) Synthesis tectonic map of the East Andaman Basin redrawn fromCurray (2005) showing pull-apart extension fault in the Central Basin(Raju et al, 2004), strike slip faults with their approximate positions such as the Shan Scarp Fault and the Mergui Faults in the East Basin, strike-slip faults zone between Mergui Ridge and Ranong Ridge, the Ranong and the Klong Marui Fault(Richter et al, 1993;Polachan and Racey, 1993;Curray, 2005), and known detailed bathymetry(Raju et al, 2004;Krabbenhoeft et al, 2010). Boundary of Thai EEZ is shown by red line.…”

mentioning

confidence: 99%

Morphology of the Andaman outer shelf and upper slope of the Thai exclusive economic zone

Jintasaeranee

Weinrebe

Klaucke

et al. 2012

Journal of Asian Earth Sciences

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Paleomagnetic results from Thailand and Myanmar: implications for the interpretation of tectonic rotations in Southeast Asia

Cited by 15 publications

References 19 publications

‘Thailand was a desert' during the mid‐Cretaceous: Equatorward shift of the subtropical high‐pressure belt indicated by eolian deposits (Phu Thok Formation) in the Khorat Basin, northeastern Thailand

‘Thailand was a desert' during the mid‐Cretaceous: Equatorward shift of the subtropical high‐pressure belt indicated by eolian deposits (Phu Thok Formation) in the Khorat Basin, northeastern Thailand

Tectonics and history of the Andaman Sea region

Morphology of the Andaman outer shelf and upper slope of the Thai exclusive economic zone

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