Discovery of the fossiliferous Cu Brei Formation (Lower Devonian) in the Kon Tum Block (South Viet Nam)

Thanh, Tong-Dzuy; Duyen, Than Duc; Hùng, Nguyễn Hữu; My, Bui Phu

doi:10.1016/j.jseaes.2006.02.006

Cited by 9 publications

(6 citation statements)

References 1 publication

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“…Unmetamorphosed dacitic lava flows, which belong to the Permian Chu Prong Formation, lie subhorizontally on the Complex, nearby the road to Sathay. Recently discovered Lower Devonian fossiliferous carbonate platform sediments of the Cu Brei Formation rest unconformably, through basal conglomerates, on the Dien Binh granitic material [55].…”

Section: Dien Binh Complexmentioning

confidence: 99%

Indosinian tectonics in Vietnam

Lepvrier¹,

Vuong²,

Maluski³

et al. 2008

Comptes Rendus. Géoscience

260

169

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In Vietnam, the Triassic Indosinian collision affected coevally the Truong Son belt and the Kontum Massif,which were not independent tectonic units, but parts of the same Gondwana-derived Indochina continental block. This thermotectonic event took place synchronously throughout Vietnam, during the Lower Triassic 250-240-Ma time interval, as demonstrated by numerous geochronological data, combining Ar-Ar and U-Pb dating methods. Structural and kinematic investigations, in the Indosinian metamorphic rocks, reveal that the collisional process resulted from a consistent northwest-striking convergence of Indochina with respect to the adjacent blocks. It is suggested that this motion was taken up by a pair of opposite subduction zones: to the north, beneath South China, and to the west, beneath western Indochina, along the Song Ma and Po Ko sutures, respectively. Tectonic markers, calc-alkaline subduction-related volcanism and granitic intrusions and the generation of high-pressure rocks that have been recently discovered support this geodynamic setting, at least along Po Ko. Along the northwest-trending Song Ma zone, the obliquity of the convergence during subduction and subsequent collision resulted in the development, within the Truong Son Belt, of a set of subparallel dextral mylonitic shear zones, under amphibolite-facies metamorphism. The intermediate segments remained weakly metamorphic or even almost devoid of metamorphism. Along Po Ko, the convergence was near-orthogonal, with a leftlateral strike-slip component; the ongoing continental subduction resulted in the reworking of the Kontum granulitic basement and the development of Indosinian HP granulitic conditions; the subsequent extension-related exhumation operated approximately in the same northwestwards direction. This Indosinian evolution, applied on a continental crust that had been probably affected, as in South China, by a Caledonian-related event, as judged by the general unconformity of the Lower Devonian sediments, the widespread occurrence of magmatic crystallisation ages of ca 450 Ma (Ordovician-Silurian), and by the approximately similar age of the primary granulitic episode in the Kontum Massif. The similarities of the Devonian facies over central, northern Vietnam and South China imply a land connection, possibly as a consequence of a Caledonian collision along Song Ma, but this does not preclude a further oceanic opening and a closure during the Indosinian.

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Section: Dien Binh Complexmentioning

confidence: 99%

Indosinian tectonics in Vietnam

Lepvrier¹,

Vuong²,

Maluski³

et al. 2008

Comptes Rendus. Géoscience

260

169

View full text Add to dashboard Cite

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“…This new finding described by Tong-Dzuy Thanh et al (2007) is a new piece of evidence for the exotic character of the Dien Binh series.…”

mentioning

confidence: 54%

“…The publication of Tong-Dzuy Thanh et al (2007) (JAES,vol. 29,1,(127)(128)(129)(130)(131)(132)(133)(134)(135) states the discovery of an outcrop dated as Lower Devonian (Pragian) at Cu Brei, a place located in the vicinity of Kon Tum town and the Ya Ly dam lake, in South-Central Vietnam.…”

mentioning

confidence: 99%

Comment on: Discovery of the fossiliferous Cu Brei Formation (Lower Devonian) in the Kon Tum Block (South Viet Nam): Tong-Dzuy Thanh, Than Duc Duyen, Nguyen Huu Hung, Bui Phu My

Maluski

2008

Journal of Asian Earth Sciences

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“…difficult to access. However, it is clear that the well-studied and dated sequences around the Sepon Mine in Lao PDR (Figures 7, 9-11) are similar to those further north in Laos (Ban, 2000;Ban et al, 2000a,b;Cannell et al, 2015;Udchachon et al, 2015;Thassanapak et al, 2018) and to those in the Vietnamese parts of the terrane (e.g., Thanh et al, 2007;Tri and Vu, 2011) and are summarized in Figures 2, 4-7. The Truong Son Terrane sedimentary succession consists of upper Cambrian to Upper Ordovician siliciclastics and minor carbonates, Silurian graptolitic shales, cherts and minor limestone, Early to Middle Devonian siliciclastics, Frasnian marginal platform reef complexes, an extensive carbonate platform from the Frasnian to the Tournaisian, coarse to fine siliciclastics from the Tournaisian to the Visean, and a final platform carbonate succession diachronously established from the Visean through to the mid-Permian (Figures 8-12).…”

Section: Truong Son Terranementioning

confidence: 88%

“…However, logistic problems of working in this area and a paucity of information make a definite terrane attribution of the Attapeu region impossible. Just to the west of the Poko Fault unmetamorphosed fossiliferous Early Devonian sediments of the Cu Brei Formation (Figure 13) rest unconformably on granites dated by K/Ar as 418+/−12 Ma to 384 +/-17 Ma showing that this region was not strongly affected by the extensive Triassic (Anisian to Carnian) metamorphism of the Kontum Terrane (Osanai et al, 2004;Nakano et al, 2007Nakano et al, , 2009Nakano et al, , 2013Nakano et al, , 2020Thanh et al, 2007).…”

Section: Kontum Terranementioning

confidence: 99%

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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Discovery of the fossiliferous Cu Brei Formation (Lower Devonian) in the Kon Tum Block (South Viet Nam)

Cited by 9 publications

References 1 publication

Indosinian tectonics in Vietnam

Indosinian tectonics in Vietnam

Comment on: Discovery of the fossiliferous Cu Brei Formation (Lower Devonian) in the Kon Tum Block (South Viet Nam): Tong-Dzuy Thanh, Than Duc Duyen, Nguyen Huu Hung, Bui Phu My

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

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