A preliminary Upper Triassic paleomagnetic pole for the Khorat plateau (Thailand): consequences for the accretion of Indochina against Eurasia

Achache, J.; Courtillot, Vincent

doi:10.1016/0012-821x(85)90042-1

Cited by 40 publications

(15 citation statements)

References 26 publications

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“…Assuming the Shan State Massif, Thailand, and the Malay Peninsula were all part of the same (Shan-Thai-Malay) plate throughout their history, this plate began to travel northward away from Gondwana in the Permocarboniferous or, at the latest, after the Early Triassic. It may have joined the South China Block by the Late Triassic [Achache and Courtillot, 1985], which could explain the orogenic phase of deformation of that age in the zone between the Shan State Massif and the South China Block, but there is insufficient paleomagnetic evidence to contim this. A large cumulative rotation of about 160 ø of the Shan-Thai-Malay plate may have happened in stages, first as it drifted northward and later because of the extrusion caused by the India-Asia collision process.…”

Section: Discussionmentioning

confidence: 99%

Devonian paleomagnetism of Yunnan Province across the Shan Thai‐South China Suture

Wu¹,

Voo²,

Liang³

1989

Tectonics

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A paleomagnetic study of Devonian sedimentary sequences from western and eastern Yunnan, China, yields contrasting paleolatitudes for these two areas. They indicate an equatorial position for eastern Yunnan, as part of the Yangtze Paraplatform or South China Block, and a paleolatitude of about 40 ø for western Yunnan as part of the Shan State (or Shan-Thai) Block, which probably was part of the Gondwana supercontinent. The majority of samples is strongly overprinted by a present-day field magnetization, but thermal demagnetization has been successful in isolating ancient, dualpolarity characteristic directions of magnetization in rocks from eastern and western Yunnan, with results from the latter passing the fold test. The paleopole from eastern Yunnan is located at 8.9øN, 10.4øE (declination/inclination = 279.2ø/ +2.7 ø, k = 13, alpha 95 = 6.9 ø, N = 33 samples from 7 sites). The paleopole from western Yunnan is located at 66.5øN, 133.8øE (declination/inclination = 18.00/+62.0 ø, k = 21, alpha 95 = 5.8 ø, N = 31 samples from 7 sites), yielding a paleolatitude of 42 ø. The two blocks studied are separated by the Red (Yuan) River and Lancang (Mekong) River fault zones, one of which is inferred to be an ancient suture.

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Section: Discussionmentioning

confidence: 99%

Devonian paleomagnetism of Yunnan Province across the Shan Thai‐South China Suture

Wu¹,

Voo²,

Liang³

1989

Tectonics

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“…A considerable quantity of such data are now available from southern and south-east Asia (Klootwijk and Bingham 1980;McElhinny et al 1981;Wensink 1981Wensink , 1983CCOP Project Office 1982;Achache et al 1983;Klootwijk et al 1983Klootwijk et al , 1985Westphal et al 1983;Besse et al 1984;Otofuji and Matsuda 1984;Pozzi et al 1984;Achache and Courtillot 1985;Kono and Tanaka 1985;Lin et al 1985). However, while the palaeomagnetic reliability is generally much better established than for cratonic areas, most of the newer data are from areas that are frequently only poorly known geologically.…”

Section: Continental Palaeomagnetismmentioning

confidence: 99%

Gondwanaland and the evolution of the Indian Ocean

Tarling¹

1988

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In regions, such as the Indian Ocean, where geophysical data are largely lacking, reconstructions must be a compromise, allowing for the evolution of 'passive' margins and the inclusion of remanent continental blocks that are now isolated within the oceanic basins. Sea-floor spreading anomalies are re-examined in the context of the foregoing considerations, and emphasis is placed on the need to match anomalies that formed within the same transform segments. Despite subsequent attempts, it is considered that Norton and Sclater's (1979) configuration of Gondwanaland and its Mesozoic-Tertiary breakup only need small, but significant modifications. These allow for the inclusion of small, but critically located continental units between the major continental blocks. Only age differences are proposed for most of their anomaly 16 reconstruction, now largely corresponding to anomaly 20 times. No changes are proposed to Norton and Sclater's reconstruction for anomaly 34 times. Alterations to older reconstructions are mainly to allow for the inclusion of the Kerguelen, Gaussberg and Broken Ridges between India and Antarctica, and for the Agulhas-Falkland (Malvinas) Plateaux between Africa and Antarctica. The revised Gondwanaland reconstruction for early-middle Jurassic times appears to be more consistent with the geological and geophysical evidence, particularly reducing the need for differential motions of Sri Lanka and of the West Antarctic Peninsula. A review of the palaeomagnetic data indicates caution in the ability of extant data to distinguish between most reconstructions proposed during the last decade; considerable re-sampling and re-evaluation are required to adequately test between such Gondwanan models.

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“…Extrusion implies that Indochina moved eastward and rotated clockwise as a set of more or less rigid blocks. Paleomagnetic data from eastern Thailand (Achache and Courtillot, 1985;Yang and Besse, 1993), west-central Thailand (Yan and Courtillot, 1989;Yang et al, 1995) and China (Yuyan and Morinaga, 1999) support an amount and sense of rotation consistent with block extrusion. The Northern Thailand Basin and Range Province (NTBRP), located between the Red River and Mae Ping faults, lies in the center of this zone of extrusion, and is ideally located within one of the 'rigid' blocks of the extrusion model (Fig.…”

Section: Introductionmentioning

confidence: 62%