The origin of the Pailin Crystalline Complex in western Cambodia, and back-arc basin development in the Paleo-Tethys Ocean

Hara, Hidetoshi; Ito, Tsuyoshi; Tokiwa, Tetsuya; Kong, Sitha; Lim, Pagna

doi:10.1016/j.gr.2020.01.007

Cited by 16 publications

(8 citation statements)

References 65 publications

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“…The Pha Som Metamorphic Complex has been regarded as derived from basin-filling sediments covering an ophiolite sequence in the Nan Back-arc Basin as well as from sediments of the Pong Nam Ron Formation in the Sa Kaeo Back-arc Basin (Hara et al 2018(Hara et al , 2020. Our detrital zircon U-Pb ages suggest that the protolith of the psammitic schists was Triassic sandstones.…”

Section: D Accretionary Complex In the Inthanon Zone And Revision Of Sandstone Classificationmentioning

confidence: 88%

“…The Nan Back-arc Basin within the Nan-Uttaradit Suture Zone is characterized by ophiolitic ultramafic to mafic rocks such as peridotite, amphibolite, gabbro, pyroxenite and serpentinite (Hutchison, 1975;Macdonald & Barr, 1984;Barr & Macdonald, 1987;Barr & Charusiri, 2011); the Pha Som Metamorphic Complex of metavolcanic and metasedimentary rocks, and piedmontite-quartz schists (Singharajwarapan & Berry, 1993; Permian limestone (Ueno & Charoentitirat, 2011); and pelagic cherts that contain Permian and Middle Triassic radiolarians (Hada et al 1999;Saesaengseerung et al 2008;Yang et al 2009). The metamorphic rocks have previously been interpreted as a remnant of an accretionary complex (Singharajwarapan & Berry, 1993, but more recently have been regarded as basin-filling sediments that originally covered the ophiolite sequence, corresponding to the (Hara et al 2020) suggest that magmatism in the back-arc basins occurred during the Late Carboniferous to Early Permian. The Nam Pat Group is composed of conglomerate, interbedded sandstone and mudstone, and mudstone, which are exposed along the eastern margin of the Pha Som Metamorphic Complex (Fig.…”

Section: E Back-arc Basin Sediments Behind the Sukhothai Arcmentioning

confidence: 99%

“…Andesitic volcaniclastic rocks underlying middle Permian limestone are considered as evidence of Permian igneous activity in NW Cambodia (Udchachon et al 2018). Permian zircons have been found in felsic igneous rocks in western Cambodia and are related to magmatism in the Sa Kaeo Back-arc Basin (Hara et al 2020). The studied sandstone from the Num Duk Formation includes abundant Early Permian detrital zircons (Fig.…”

mentioning

confidence: 99%

“…11d). The detrital zircon U-Pb ages from basin-filling sediments in the Sa Kaeo Back-arc Basin (Pong Nam Ron and O Smoet formations) present a clear peak of Late Permian to Early Triassic with minor Palaeozoic and Proterozoic signatures, suggesting a large contribution to these sediments from rocks produced by the Late Permian to Early Triassic igneous activity (Hara et al 2018(Hara et al , 2020. In addition, the sandstones of the Sa Kaeo Back-arc Basin indicate a more basaltic provenance compared with those of the Nan Back-arc Basin (Fig.…”

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confidence: 99%

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Revisiting the tectonic evolution of the Triassic Palaeo-Tethys convergence zone in northern Thailand inferred from detrital zircon U–Pb ages

et al. 2020

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Detrital zircon U–Pb ages for sediments in and around the Palaeo-Tethyan convergence zone in northern Thailand provide constraints for tectonic interpretations of the Indochina Block, the Sibumasu Block, the Inthanon Zone accretionary complex and the Nan Back-arc Basin during the Triassic. In sedimentary rocks of the Indochina Block, almost all of the Palaeozoic and Triassic zircons were sourced from the collision zone between the Indochina and South China blocks, and an active continental margin in the western Indochina Block. Sediments of the Sibumasu Block were supplied by erosion of Archaean basement and from the Grenville and the Pan African orogenies, but show no record of Permian to Triassic igneous activity. Accretionary complex sediments have provenances of both the Sukhothai Arc and the Indochina and South China blocks, with detrital zircons of various ages being supplied from crustal uplift and erosion related to the Indosinian I orogeny. Sedimentary rocks of the Nan Back-arc Basin are widely distributed not only in the Nan–Uttaradit but also in northern Sukhothai areas. The origin of the Pha Som Metamorphic Complex and associated formations can be traced to basin-filling sediments in the Nan Back-arc Basin. These detrital zircon U–Pb ages have also allowed identification of the changing tectonic setting in the Palaeo-Tethys convergence zone from the ‘erosion of Proterozoic continental basement’ to ‘Palaeozoic active continental margin in the western Indochina Block’ and ‘Palaeozoic, Permian to Triassic collision zone between the South China and Indochina blocks’ through to ‘Triassic active Sukhothai Arc’.

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Section: D Accretionary Complex In the Inthanon Zone And Revision Of Sandstone Classificationmentioning

confidence: 88%

Section: E Back-arc Basin Sediments Behind the Sukhothai Arcmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Revisiting the tectonic evolution of the Triassic Palaeo-Tethys convergence zone in northern Thailand inferred from detrital zircon U–Pb ages

et al. 2020

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“…Hada [19] categorized Sa Kaeo-Chanthaburi area as southern segment of the Nan-Uttaradit suture in Eastern Thailand. Rock formations along this area, clearly formed along the main NW-SE structure, were subdivided into two parallel belts: the western belt of Chanthaburi chert-clastic sequence and the eastern belt of serpentinite Thung Kabin mélange [19][20][21]. The Thung Kabin mélange is characterized by strongly foliated serpentinite including various kinds of blocks.…”

Section: Sa Kaeo-chanthaburi Study Areamentioning

confidence: 99%

Petrogenesis of mafic-ultramafic and associated rocks along Sa Kaeo and Pattani Sutures, Thailand

Assawincharoenkij¹,

Sutthirat²,

Chenrai³

et al. 2021

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Petrogenesis of the early Jurassic Ora batholith in south‐western Cambodia

et al. 2022

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The Ora batholith in south‐western Cambodia is situated in the western part of Indochina and east of the Inthanon–Bentong–Raub Palaeo‐Tethys suture and thus bears significant constraints for the equivocal crustal generation of the Palaeo‐Tethys orogenic belt in Mainland South‐east Asia. The Ora batholith consists of monzonitic granite (Group 1), alkali‐feldspar granite (Group 2), and biotite granite (Group 3), and they yield similar Early Jurassic ages of 186.0–199.7 Ma. Group 2 are high‐silica (SiO2 > 75 wt%) rocks with lower TiO2, Al2O3, FeOtot, MgO, CaO, P2O5, Eu, Ba, Sr, P, and Ti contents compared to those of the other two groups. Group 2 and 3 are classified as fractionated‐type granitoids, whereas Group 1 is unfractionated granite as the complementary residual of the fractionated rocks. All groups have positive εHf(t) values from +2.29 to +8.83, suggesting they were cogenetic and derived from partial melting of the lower crust with the addition of asthenospheric mantle material. Integrating with other granitoids in this region, we suggest the Ora granitoids belong to I‐type granitoids. Our petrogenetic and zircon U–Pb age data suggest the Ora granitoids were related to the Early Jurassic post‐collisional magmatism that resulted from crustal thickening and mantle lithospheric delamination due to a denser crustal root than the underlying mantle lithosphere after the Palaeo‐Tethys Ocean closure and collision between the Sibumasu and Indochina terranes. Then the following upwelling of the asthenospheric mantle not only heated and caused partial melting of the lower crust and mantle wedge, but also supplied asthenospheric material to generate the high‐εHf(t) magma.

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The origin of the Pailin Crystalline Complex in western Cambodia, and back-arc basin development in the Paleo-Tethys Ocean

Cited by 16 publications

References 65 publications

Revisiting the tectonic evolution of the Triassic Palaeo-Tethys convergence zone in northern Thailand inferred from detrital zircon U–Pb ages

Revisiting the tectonic evolution of the Triassic Palaeo-Tethys convergence zone in northern Thailand inferred from detrital zircon U–Pb ages

Petrogenesis of mafic-ultramafic and associated rocks along Sa Kaeo and Pattani Sutures, Thailand

Petrogenesis of the early Jurassic Ora batholith in south‐western Cambodia

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