Age, composition and tectonic implications of late Ordovician-early Silurian igneous rocks of the Loel Volcanic Belt, NW Laos

Long, Yongzhen; Zhang, Dexian; Huang, Dezhi; Yang, Xiaoyong; Chen, Shanshan; Bayless, Richard C.

doi:10.1080/00206814.2019.1576065

Cited by 12 publications

(6 citation statements)

References 64 publications

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“…Thailand the stratigraphy on either side of the Loei Suture is different with, in the eastern part of the foldbelt, Silurian to Early Devonian mainly siliciclastics and volcaniclastics and minor limestones with a Silurian to early Devonian coralbrachiopod fauna, interdigitating westwards with a dated Silurian to Early Devonian volcanic arc east of the Loei Suture (Figure 5) (Fontaine et al, 2005;Khositanont et al, 2013;Zhao et al, 2016). The continuation of the eastern Loei belt northwards into Laos contains a similar succession except that older Ordovician limestone (with brachiopods) and igneous rocks are also present with dacitic tuff at 449.6 +/-2.6, rhyolitic tuff at 419.8 +/-2.6, and a dioritic dyke at 417 +/-4.9 Ma (Long et al, 2019). We therefore separate the eastern Loei Foldbelt in Thailand and Laos from the western Loei Foldbelt and place it within the Truong Son Terrane.…”

Section: Loei-phetchabun Terranementioning

confidence: 97%

“…They are succeeded in the Silurian of Laos and Vietnam by deep-water radiolarian cherts and volcanics of the Vang Nang Formation (at Sepon) and the Long Dai Formation and Long Dai Volcanic Arc in Vietnam. Dacitic tuffs of arc affinity are dated as latest Ordovician in the Truong Son Terrane's eastern Loei foldbelt (Long et al, 2019). This suggests Truong Son's attachment to a continental margin in the Ordovician and rifting in the Late Ordovician allowing both very deep marine conditions in the Silurian and the establishment of a subducting and arc-producing margin by the Llandoverian.…”

Section: Rifting From Gondwanamentioning

confidence: 97%

“…Stratigraphic data are from numerous sources. Ordovician gabbro within the Nan Suture is from Khin et al (2014) and Long et al (2019) and Devonian and Carboniferous dates are from Shen et al (2010a). The Tan Lam Formation in the Vietnamese sector of Truong Son represents the influx of coarse terrigenous siliciclastics caused by the first collision of the Truong Son Terrane with the South China Terrane in the late Silurian to Early Devonian.…”

Section: Truong Son Terranementioning

confidence: 99%

“…In this area, the orogenic belt known as the Loei Foldbelt (Loei in Figure1) is divided into a western Loei-Phetchabun Terrane and an eastern Truong Son Terrane (East Loei on Figure1) separated by the Loei Suture. (A) Ordovician in Truong Son Terrane in Laos based onLong et al (2019). (B) Silurian to Early Devonian.…”

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confidence: 99%

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The Truong Son, Loei-Phetchabun, and Kontum Terranes in Indochina: Provenance, Rifting, and Collisions

2021

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The three main regions of Indochina are defined as the Truong Son, Loei-Phetchabun, and Kontum terranes. The aim of this review is to integrate numerous petrological studies with sedimentary, palaeontological, and provenance studies in order to construct a preliminary tectonic model which shows the terranes docked in the earliest Carboniferous (Truong Son with Loei-Phetchabun) and in the Permian (Kontum). The Kontum Terrane is characterized by Proterozoic magmatism, mid-Ordovician to Early Devonian granites, and Permian charnockites. Major carbonate platforms developed in the Givetian to earliest Tournaisian on Truong Son and from the Visean to mid-Permian across Truong Son and Loei-Phetchabun terranes. The Truong Son has Silurian granites and a Late Ordovician to Silurian magmatic arc along its southern and western borders caused by subduction of oceanic lithosphere, the remnants of which are now partially preserved in the Loei and Tamky sutures. A region to the east of the Loei Suture in the Loei Foldbelt has a similar-age volcanic arc extending northwards into Laos and is included in Truong Son. A platform-margin coral-stromatoporoid reef developed on Truong Son in the Frasnian and was coincident with a gap in magmatism until the Pennsylvanian with granite magmatism became widespread until the Late Triassic. In the Loei-Phetchabun Terrane, Devonian siliciclastics, volcanics are overlain by Givetian limestones and patch reefs and in turn overlain by Late Devonian to earliest Tournaisian radiolarian cherts and siliciclastics. Tournaisian to early Visean siliciclastic turbidites were coincidental with initial uplift and deformation and were replaced by Visean terrestrial evaporites and coal and marine limestones. Arc magmatism along the Loei-Phetchabun Terrane indicates intermittent eastward subduction from mid-Devonian to mid-Triassic. Carboniferous-Triassic volcanism extends eastward along the northern margin of Cambodia and is probably an extension of Loei-Phetchabun. Ordovician within-plate basalts in Kontum and the transition from shallow marine Ordovician siliciclastics to Silurian deep-marine sediments and a volcanic arc in Truong Son suggest rifting of both terranes from Gondwana in the Late Ordovician. Initial docking of Truong Son with South China was probably in the late Silurian to Early Devonian and docking of Loei-Phetchabun and Truong Son was in the late Tournaisian to early Visean.

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Section: Loei-phetchabun Terranementioning

confidence: 97%

Section: Rifting From Gondwanamentioning

confidence: 97%

Section: Truong Son Terranementioning

confidence: 99%

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confidence: 99%

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The Truong Son, Loei-Phetchabun, and Kontum Terranes in Indochina: Provenance, Rifting, and Collisions

2021

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“…The Ordovician to earliest Devonian (490-400 Ma) zircons are interpreted to be sourced from the 423 Ma rhyolite in the Loei area in Thailand (Zhao & Feng, 2016), and the 450-418 Ma rhyolitic and dacitic tuff and diorite dike in northwestern Lao PDR (Laos) (Long et al 2019). These igneous activities, also identified in SW Yunnan in China, occurred in an active continental margin along the western margin of the Indochina Block (Liu et al 2020).…”

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confidence: 97%

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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Prototethyan orogenesis in southwest Yunnan and Southeast Asia

Wang

Qian

et al. 2022

Sci. China Earth Sci.

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Age, composition and tectonic implications of late Ordovician-early Silurian igneous rocks of the Loel Volcanic Belt, NW Laos

Cited by 12 publications

References 64 publications

The Truong Son, Loei-Phetchabun, and Kontum Terranes in Indochina: Provenance, Rifting, and Collisions

The Truong Son, Loei-Phetchabun, and Kontum Terranes in Indochina: Provenance, Rifting, and Collisions

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

Prototethyan orogenesis in southwest Yunnan and Southeast Asia

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