Mid-Cretaceous inversion in the Northern Khorat Plateau of Lao PDR and Thailand

Smith, Paul F. Lovatt; Stokes, Robert B.; Bristow, Charlie S.; Carter, Andrew

doi:10.1144/gsl.sp.1996.106.01.15

Cited by 40 publications

(20 citation statements)

References 4 publications

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“…More recently, Lovatt-Smith et al (1996) interpreted the Khorat Basin as being a foreland basin deposited at the front of a Jurassic Orogenic Belt created by the Song Ma and Song Da sutures to the north or NE, which broadly parallel the axis of the Khorat Basin and mark the suture between the southern China Block and Indochina. Racey et al (1994Racey et al ( , 1996Racey et al ( , 1997a concluded that although the Nam Phong Formation could have in part been deposited during thermal subsidence following Triassic extension the same model could not be applied to the overlying Phu Kradung to Khok Kruat Formations owing to the presence of a hiatus spanning a large part of the Jurassic.…”

Section: Tectonic Models For the Evolution Of The Khorat Basinmentioning

confidence: 99%

“…However, the unconformity is now considered to fall within the Nam Phong Formation (as discussed above) and separates a Lower Nam Phong Formation of Late Triassic age from an Upper Nam Phong Formation of probable Jurassic (?Late Jurassic) age. Lovatt-Smith et al (1996) noted that there is little evidence on seismic data for major syndepositional faulting in the Khorat Basin, suggesting that the stretching factor was low. On regional seismic lines Khorat Group formations have a mainly layercake appearance with no significant topographic features for the sediments to infill; that is, they appear typical of deposition in a thermal sag driven setting.…”

Section: Tectonic Models For the Evolution Of The Khorat Basinmentioning

confidence: 99%

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Mesozoic red bed sequences from SE Asia and the significance of the Khorat Group of NE Thailand

Racey

2009

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New geological data are presented and previously published information is reviewed to demonstrate that much of the Khorat Group (Phu Kradung to Khok Kruat Formations) of NE Thailand is Early Cretaceous in age. It is suggested that the Mesozoic red bed sequences of neighbouring Indochina are likely to be of similar age rather than spanning the entire Late Triassic to Early Cretaceous as previously assumed. Moreover, the Lower Nam Phong Formation dated as Late Triassic and previously included as the basal formation of the Khorat Group is now removed from this group, thus creating a hiatus within the Jurassic. There is therefore no clear relationship between the Indosinian Orogeny and the Triassic collision of the Sibumasu (also referred to as Shan-Thai) and Indochina Blocks and the subsequent deposition of the Khorat Group in a Late Triassic-Early Cretaceous thermal sag basin. It is now proposed that much of the sequence was deposited during the Late Jurassic-Early Cretaceous. Jurassic sediments may be absent across much of the Khorat Plateau whereas marine Jurassic sediments to the west and east show no sediments younger than Bajocian. Because sea levels were generally rising in the Middle and Late Jurassic it is likely that the Khorat region was uplifted at this time. It is suggested that the Khorat Group was originally deposited in a foreland basin setting rather than a thermal sag basin following Late Triassic rifting. Moreover, the original site of deposition was to the north in southern China, with the present-day location being the result of movement along the Red River Fault coupled with a clockwise rotation of the Indochina Block (on which the Khorat Group sits) with respect to the South China Block.

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Section: Tectonic Models For the Evolution Of The Khorat Basinmentioning

confidence: 99%

Section: Tectonic Models For the Evolution Of The Khorat Basinmentioning

confidence: 99%

Mesozoic red bed sequences from SE Asia and the significance of the Khorat Group of NE Thailand

Racey

2009

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“…During the Mesozoic era, the study area lay at the south-eastern margin of the Eurasian continent. Table 1 Source references for data points in Figure 1 References Data points References Data points ASCOPE (1981); Sales et al (1997) 108-110 Jones et al (1966) 40 Areshev et al (1992) 37,38 Li et al (1997 70 Ampornmaha (1995) 18,25 Lovatt-Smith et al (1996) 13 Barber (2000) 56,57 Metcalfe (1990) 25 Fontaine et al (1983) 15,17,18,24,25,27,28,29,30, 40,45,46,101,103,104 Metcalfe (2000) 31,32,33 Fontaine andKhoo (1990) 31,32,39 Metcalfe &Chakraborty (1994) 30 Fontaine et al (1993) 16 Meesook andGrant-Mackie (1996) 18,58,59,60 GDBGMR (1996) 73, 82-84, and other points in Guangdong Province Pang et al (2004b) 74,75,76 GXBGMR (1985 85 and other points in Guangxi Province Qiu (1997) 79 Gervasio (1968) 97 Tamura & Hon (1977) 43 Hao et al (2001) 77,78 Schlünter (1996) 105,115 Hutchison (1989) 1,2,3,9,11,15,20,23,25,27,28, 32,34,35,36,41,43,44,45,47, 48,49,50,51,52,54,55,56,57, 61-67 Singharajwarapan and Berry (2000) 10 Kudrass et al (1986) 91 Tate (1991) 45,46 Khuc (2000 1-15, 23,25 Taylor and Heyes (1980) 106,107 Isozaki et al (1988); Tumanda (1991); Zamoras and Matsuoka (2004) 96 William et al (1988) 53 Jasi...…”

Section: Tectonic Settingmentioning

confidence: 99%

Mesozoic paleogeography and tectonic evolution of South China Sea and adjacent areas in the context of Tethyan and Paleo‐Pacific interconnections

et al. 2008

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During the Mesozoic era, the South China Sea and its environs were located at the south-eastern margin of the Eurasian continent. There has been hot debate on the influences of Tethyan and Paleo-Pacific tectonics to the Mesozoic evolution of the area. This paper compiles lithofacies maps of six time slices and discusses the paleogeographic and tectonic evolution of the area based on this compilation and other data on structural deformation and magmatism. In the Early Triassic, the Paleotethys Ocean extended eastward to the study area through the Song Da passage. Then a significant east-west differential evolution began. In the Late Triassic, the western area uplifted as a result of the collision between the Indosinian and South China blocks during the Indosinian orogeny, and the Song Da passage has closed since then. Meanwhile, a transgression of Paleo-Pacific waters occurred in the eastern and south-eastern portions of the area, forming the 'East Guangdong-North-west Borneo Sea'. In the Early Jurassic, seawater transgression was even more pronounced, resulting into the connection of this sea with the Mesotethys Ocean to the west. Large quantities of Tethyan water carrying Tethyan organisms entered the area. In the Middle Jurassic, a short-lived transgression occurred in the eastern Mesotethys and resulted in the formation of the 'Yunnan-Burma Sea'. The Late Jurassic to Early Cretaceous was the climax of the subduction of both the Mesotethys and PaleoPacific towards the Eurasian continent. This led to the formation of the great 'Circum South-east Asia Subduction-Accretion Zone' in the Middle or Late Cretaceous. This paper also presents various lines of evidence for a newly recognized segment of this Mesozoic subduction-accretion zone buried under Cenozoic sediments in the north-eastern South China Sea.The deep-sea basin of the South China Sea (SCS) was formed by seafloor spreading in the Late Oligocene to Early Miocene (Holloway 1982;Taylor & Hayes 1983;Briais et al. 1993). The shelves and slopes of the SCS are floored mainly by Cenozoic sediments. While great attention has been paid to the geology and evolution of the SCS and its Cenozoic sedimentary basins, there has been little study on the pre-Cenozoic geology and evolution of the area. This has changed recently, stimulated by the urgent demand to know the pre-Cenozoic hydrocarbon potential of the region (e.g. Su et al.

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“…An alternative model suggested that the Khorat Group accumulated in a thermal sag basin that formed after the Late Triassic extension linked to collapse of overthickened crust produced by the Indosinian Orogeny (Cooper et al ., 1989). More recently the Khorat was interpreted as a foreland basin associated with flexural subsidence in front of a Jurassic Orogenic Belt, which helps us explain the broad lateral extent and relatively uniform thickness (Lovatt‐Smith et al ., 1996).…”

Section: Introductionmentioning

confidence: 99%

Linking hinterland evolution and continental basin sedimentation by using detrital zircon thermochronology: a study of the Khorat Plateau Basin, eastern Thailand

2003

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The effectiveness of detrital zircon thermochronology as a means of linking hinterland evolution and continental basin sedimentation studies is assessed by using Mesozoic continental sediments from the poorly understood Khorat Plateau Basin in eastern Thailand. New uranium lead (U‐Pb) and fission‐track (FT) zircon data from the Phu Kradung Formation identify age modes at 141 ± 17 and 210 ± 24 Ma (FT) and 2456 ± 4, 2001 ± 4, 251 ± 3, and 168 ± 2 Ma (U‐Pb), which are closely similar to data from the overlying formations. The FT data record post‐metamorphic cooling, whereas the U‐Pb data record zircon growth events in the hinterland. Comparison is made between detrital zircon U‐Pb data from ancient and modern sources across Southeast Asia. The inherent stability of the zircon U‐Pb system means that 250 Myr of post‐orogenic sedimentary recycling fails to change the regional zircon U‐Pb age signature and this precludes use of the U‐Pb approach alone for providing unique provenance information. Although the U‐Pb zircon results are consistent with (but not uniquely diagnostic of) the Qinling Orogenic Belt as the original source terrane for the Khorat Plateau Basin sediments, the zircon FT cooling data are more useful as they provide the key temporal link between basin and hinterland. The youngest zircon FT modes from the Khorat sequence range between 114 ± 6 (Phra Wihan Formation) and 141 ± 17 Ma (Phu Kradung Formation) that correspond to a Late Jurassic/Early Cretaceous reactivation event, which affected the Qinling Belt and adjacent foreland basins. The mechanism for regional Early Cretaceous erosion is identified as Cretaceous collision between the Lhasa Block and Eurasia. Thus, the Khorat Plateau Basin sediments might have originated from a reactivation event that affected a mature hinterland and not an active orogenic belt as postulated in previous models.

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Mid-Cretaceous inversion in the Northern Khorat Plateau of Lao PDR and Thailand

Cited by 40 publications

References 4 publications

Mesozoic red bed sequences from SE Asia and the significance of the Khorat Group of NE Thailand

Mesozoic red bed sequences from SE Asia and the significance of the Khorat Group of NE Thailand

Mesozoic paleogeography and tectonic evolution of South China Sea and adjacent areas in the context of Tethyan and Paleo‐Pacific interconnections

Linking hinterland evolution and continental basin sedimentation by using detrital zircon thermochronology: a study of the Khorat Plateau Basin, eastern Thailand

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