Structure and tectonics of a Late Jurassic, arcuate fold belt in the Ban Don Group, Southern Vietnam

Schmidt, William; Handschy, James W.; Hoang, Bui Huy; Morley, Christopher; Linh, Do Van; Tùng, Nguyễn Thanh; Tuấn, Nguyễn Quốc

doi:10.1016/j.tecto.2021.229040

Cited by 8 publications

(8 citation statements)

References 91 publications

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“…Meanwhile, U-Pb geochronology and Lu-Hf isotopic signatures of the Huai Hin Lat formation (HHF) suggest that the western margin of the Khorat Plateau may have been part of an early Paleozoic arc system [ 64 – 70 ], which is consistent with the prominence of early Paleozoic zircons, or approximately 452 Ma [ 71 , 72 ], and similar to the South China Terrane [ 73 – 76 ]. In addition, the 290 Ma zircon isotopic signature in the HHF is consistent with crystallization ages from granitoids within the Indochina Terrane that span from 310 to 203 Ma [ 54 , 77 – 84 ] and is more evolved than the Khao Khwang Fold-Thrust Belt [ 85 , 86 ]. Therefore, these ages may be associated with Late Carboniferous to Middle Permian subduction-related volcanic arcs as a result of the early stages of the South China collision with Vietnam and Indochina [ 73 , 76 ], or the similarly timed Indosinian orogeny caused by the collision of the Sibumasu and Indochina Terranes [ 58 , 83 ].…”

Section: Discussionsupporting

confidence: 61%

“…Over time, these two microcontinents became more stable, and the Nam Phong Formation occurred ( Fig 13B ) from sediments of felsic igneous rocks and quartzose sedimentary rocks [ 59 ], bounded below and above by major unconformities, deposited in the NW-SE trending basin in similarity to south Vietnam and NE Cambodia [ 84 ]. The ostracod assemblage and microfacies in the lower Jurassic Nam Phong Formation, above the oldest known dinosaur footprints site in Thailand, indicate deposition in a shallow and low-energy fluvial-lacustrine regime [ 85 ].…”

Section: Discussionmentioning

confidence: 99%

“…The ostracod assemblage and microfacies in the lower Jurassic Nam Phong Formation, above the oldest known dinosaur footprints site in Thailand, indicate deposition in a shallow and low-energy fluvial-lacustrine regime [ 85 ]. During this period, a contractional fold belt in the basin developed during the Early and Middle Jurassic affected by the Jurassic tectonic of the southeastern Indochina Terrane [ 84 ].…”

Section: Discussionmentioning

confidence: 99%

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Geochemistry and provenance of Mesozoic sandstones in Khon Kaen Geopark: Implication for tectonics of the western Khorat Plateau of Thailand

et al. 2023

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Khon Kaen Geopark, representing an area of dinosaur fossil diversity, was selected for investigations to reveal the origin and tectonic setting of the Khorat Group. The area occupied by Mesozoic sedimentary rocks of four formal formations of the Khorat Group, namely the Phra Wihan Formation (PWF), Sao Khua Formation (SKF), Phu Phan Formation (PPF), and Khok Kruat Formation (KKF). A field investigation and macroscopic observations suggested that the immature sedimentary rocks of the study area are mainly clast-supported, pebbly sandstone and siltstone with few calcretes. The 50 rock samples that were selected for petrographical and geochemical investigations revealed that the sandstones of the PWF and PPF are quartz arenite and sublitharenite, with some subarkose, whereas those of the SKF are mainly subarkose and sublitharenite. In addition, the KKF dominantly presents sublitharenite with pebbles and calcretes. Mesozoic sandstones contain quartz, feldspars, various types of rock fragments, and accessory minerals (biotite, muscovite, zircon, and tourmaline), with siliceous, ferrous, and calcareous cement. Petrographic (Q–F–L) and geochemical (major and trace element) data suggested that the sources of sediments are mostly quartzose sedimentary rocks and some felsic-intermediate igneous rocks. Chondrite-normalized rare earth element patterns indicated that the origins of the studied sandstones are quartzose sedimentary rocks deposited in a passive continental margin or an upper continental crust. Geochemical traits of the sedimentary successions demonstrated that the provenance of the Khorat Basin prior to reworking by fluvial processes was situated in the passive continental margin or recycled orogen of the paleo-volcanic arc during the Mesozoic period.

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Section: Discussionsupporting

confidence: 61%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Geochemistry and provenance of Mesozoic sandstones in Khon Kaen Geopark: Implication for tectonics of the western Khorat Plateau of Thailand

et al. 2023

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“…2 Stratigraphic overview of the offshore successions in the Cuu Long and Nam Con Son basins and their time equivalents in onshore southern Vietnam (modified from Hennig et al 2018). Letters in the CLB and NCSB represent the seismic horizons Triassic igneous rocks (Nguyen et al 2004;Fyhn et al 2010;Shellnutt et al 2013;Hennig-Breitfeld et al 2021;Schmidt et al 2021). This Cretaceous granitic belt extends into SW Vietnam and SE Cambodia (Fyhn et al 2016;Nong et al 2021;Waight et al 2021) and across the Sunda Shelf into Borneo (Hennig et al 2017b;Breitfeld et al 2017Breitfeld et al , 2020b.…”

Section: Regional Backgroundmentioning

confidence: 99%

Provenance of Oligocene–Miocene sedimentary rocks in the Cuu Long and Nam Con Son basins, Vietnam and early history of the Mekong River

Breitfeld

Hennig-Breitfeld

BouDagher‐Fadel

et al. 2022

Int J Earth Sci (Geol Rundsch)

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The offshore Cuu Long (CLB) and Nam Con Son (NCSB) basins of SE Vietnam are two important Cenozoic hydrocarbon-bearing basins in the southern South China Sea (SCS), which can contribute to understanding the evolution of major SE Asian river systems, in particular the Mekong River. The Oligocene to Early Miocene basin fill of the Cuu Long Basin is dominated by sediment sourced locally from the Da Lat Zone basement on land. Sandstones have abundant Cretaceous detrital zircons and heavy mineral assemblages dominated by apatite and epidote. The Bach Ho Unconformity at c. 16 to 20.5 Ma marks a major provenance change and the overlying Middle to Late Miocene Con Son and Dong Nai formations were sourced by a large river system, which drained Indochina or even the Himalaya, resembling the present-day Mekong River. These formations have heterogeneous detrital zircon populations dominated by Triassic ages and zircon–rutile–tourmaline-dominated heavy mineral assemblages. The Oligocene Cau and Early Miocene Dua formations of the Nam Con Son Basin have a similar provenance to the CLB Con Son and Dong Nai formations, indicating a comparable drainage history of a large proto-Chao Phraya. At the Dua Unconformity at c. 15.4 to 17 Ma the Indochina provenance signature changes to a predominant Sibumasu signature.The early Mekong River evolution is suggested to have involved two river systems. A proto-Mekong 1 initially filled the CLB, while at the same time a proto-Chao Phraya River with a capture area into the Himalaya filled the Malay Basin and/or the NCSB. At the end of the Early Miocene drainage was completely reorganised, and the proto-Mekong 1 captured the headwaters of the proto-Chao Phraya and became the proto-Mekong 2, while the NCSB was filled by sediment from the Malay–Thai Peninsula. This major change marks a very important drainage reorganisation in the southern SCS region.

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“…Tri and Khuc (2011), through a remote sensing and field‐based study, suggested that during the Early and Middle Jurassic, Southern Vietnam was situated in a passive margin setting along the eastern edge of the Indochina plate. This passive margin setting transitioned into a more dynamic back‐arc fold‐thrust belt, marked by a shift from passive to active tectonic setting, with subsequent deformation driven by changes in subduction angle and/or subduction obliquity during the Jurassic (Schmidt et al., 2021). Throughout the Late Jurassic and the Cretaceous, igneous activity along the coastlines of southern Vietnam and southeastern China was linked to an eastern subduction zone (Schmidt et al., 2021; Shellnutt et al., 2013; Thuy et al., 2004; Xu et al., 2016).…”

Section: Geologic Settingmentioning

confidence: 99%

Neogene‐Recent Reactivation of Pre‐Existing Faults in South‐Central Vietnam, With Implications for the Extrusion of Indochina

Richard,

Burberry,

Hoang

et al. 2024

Tectonics

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Vietnam contains complex faults coupled with a diffuse igneous province that has been active since the mid‐Miocene. However, existing fault maps demonstrate little consensus over the location of Neogene basalt flows and relative ages of mapped faults, which complicates interpretations of tectonic model for the evolution of Indochina. This paper identifies discrete tectonic blocks within Vietnam and aims to define the Neogene‐Recent tectonic setting and kinematics of south‐central Vietnam by analyzing the orientation, kinematics, and relative ages of faults across each block. Fault ages and relative timing are estimated using cross‐cutting relationships with dated basalt flows and between slickenside sets. Remote sensing results show distinct fault trends within individual blocks that are locally related to the orientations of the basement‐involved block‐bounding faults. Faults observed in the field indicate an early phase of dip‐slip motion and a later phase of strike‐slip motion, recording the rotation of blocks within a stress field. Faulting after the change in motion of the Red River Fault Zone at ∼16 Ma is inferred, as faults cross‐cut basalt flows as young as ∼0.6 Ma. Strike‐slip motion on block‐bounding faults is consistent with rotation and continuous extrusion of each block within south‐central Vietnam. The rotation of the blocks is attributed to the “continuum rubble” behavior of small crustal blocks influenced by upper mantle flow after the collision between India and Eurasia. We infer a robust lithospheric‐asthenospheric coupling in the extrusion model, which holds implications for other regions experiencing extrusion even in the absence of a free surface.

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Structure and tectonics of a Late Jurassic, arcuate fold belt in the Ban Don Group, Southern Vietnam

Cited by 8 publications

References 91 publications

Geochemistry and provenance of Mesozoic sandstones in Khon Kaen Geopark: Implication for tectonics of the western Khorat Plateau of Thailand

Geochemistry and provenance of Mesozoic sandstones in Khon Kaen Geopark: Implication for tectonics of the western Khorat Plateau of Thailand

Provenance of Oligocene–Miocene sedimentary rocks in the Cuu Long and Nam Con Son basins, Vietnam and early history of the Mekong River

Neogene‐Recent Reactivation of Pre‐Existing Faults in South‐Central Vietnam, With Implications for the Extrusion of Indochina

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