The Nan-Uttaradit-Sa Kaeo Suture as a Main Paleo-Tethyan Suture in Thailand: Is it Real?

The closure of Palaeo-Tethys in Eastern Myanmar and Northern Thailand: New insights from zircon U–Pb and Hf isotope data

“…However, in northern Thailand these carbonates are notably absent: instead, Sibumasu sedimentary cover here comprises deeper pelagic sediments such as clastics, mudstones and cherts. It has been interpreted that these represent Palaeo-Tethys sediments that were emplaced onto Sibumasu during suturing and continental collision (Caridroit et al, 1992;Ueno and Hisada, 2001). Reconstructing the mé-lange and thrust structures within northern Thailand, Hara et al (2009) assumed a top-to-south shear direction for these Palaeo-Tethys sediments, suggesting that the Palaeo-Tethys subduction zone was orientated northwards beneath the Indochina terrane, from the Permian to the Triassic.…”

“…Ridd (2014) noted that in the most recent definitions some authors have envisioned the Inthanon Zone as a foreland fold and thrust belt located west of the Palaeo-Tethys suture (Hara et al, 2009;Barber et al, 2011;Cobbing, 2011;Crow and Khin Zaw, 2011), although Ridd (2014) dissented from this view. Some workers go further, and consider the Inthanon Zone to be separate of Sibumasu itself, or at best on the marginal flanks of Sibumasu (e.g., Ueno, 1999;Ueno and Hisada, 2001).…”

Nd isotopic composition of Late Devonian seawater in western Thailand: Geotectonic implications for the origin of the Sibumasu terrane

“…It is widely accepted that the two principal microcontinents, Sibumasu in the west and Indochina in the east, had formerly been a part of Gondwana. There is, however, still an ongoing debate on the overall plate tectonic model and the position of the Paleotethys suture (e.g., Ueno and Hisada, 2001;Hisada et al, 2004;Ferrari et al, 2008;Kamata et al, 2009;Metcalfe, 2009). The tectonic framework of Thailand is formed of four units (Fig.…”

“…It is characterized by various types of rocks, including Devonian-Triassic deep-water radiolarian cherts, Carboniferous-Permian carbonates deposited on seamounts, and basaltic rocks. Because the Inthanon Zone also contains metamorphic rocks of the Precambrian basement and preDevonian sedimentary rocks (Cambrian sandstones and Ordovician limestones), it is suggested that the Sibumasu Terrane structurally underlies the Paleotethys accretionary complex along a low-angle thrust (e.g., Ueno and Hisada, 2001;Kamata et al, 2009). The Sukhothai Terrane (Barr and Macdonald, 1991) is interpreted to be a magmatic island arc which developed along the margin of the Indochina terrane (Sone and Metcalfe, 2008).…”

Curie Point Depth from Spectral Analysis of Magnetic Data in the Southeast Tibet

“…On the other hand, the formation of the Sukhothai Arc may have an effect on the geothermal field in the area. The volcanic arc system, Sukhothai Arc [10,16,[64][65][66][67], was constructed in the late Carboniferous-early Permian on the margin of the Indochina Block (V) by northwards subduction of the Palaeo-Tethys. However, it is unlikely that the arc magmatism could influence the CPD distribution due to the age-old magmatism.…”