Lower Triassic mixed carbonate and siliciclastic setting with Smithian–Spathian anoxic to dysoxic facies, An Chau basin, northeastern Vietnam

Komatsu, Toshimitsu; Naruse, Hajime; Shigeta, Yasuteru; Takashima, Reishi; Maekawa, Takumi; Dang, Huyen T.; Dinh, Tien C.; Nguyen, Phong Duc; Nguyen, Hung H.; Tanaka, Gengo; Sone, Masatoshi

doi:10.1016/j.sedgeo.2013.10.009

Cited by 34 publications

(6 citation statements)

References 45 publications

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“…These structures, for instance, were documented in the Spathian Virgin Limestone of southern Nevada on hummocky cross‐stratified proximal sandy tempestites (Mata & Bottjer, ). However, Hips () also reported such structures from Lower Triassic supratidal‐flat environments in Hungary, and they have also been observed in the mixed carbonate and siliciclastic Lower Triassic of north‐east Vietnam (Komatsu et al ., ).…”

Section: Microbialite Associations and Their Fabricsmentioning

confidence: 99%

Microbial deposits in the aftermath of the end‐Permian mass extinction: A diverging case from the Mineral Mountains (Utah, USA)

et al. 2015

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International audienceData indicate that the morphologies of the three microbialite associations are controlled primarily by accommodation, hydrodynamics, bathymetry and grain supply. This study suggests that microbial constructions are controlled by changes between trapping and binding versus precipitation processes in variable hydrodynamic conditions. Due to the presence of numerous metazoans associated with microbialites throughout the Smithian increase inaccommodation and Spathian decrease in accommodation, the commonly assumed anachronistic character of the Early Triassic microbialites and thetraditional view of prolonged deleterious conditions during the Early Triassic time interval is questioned

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Section: Microbialite Associations and Their Fabricsmentioning

confidence: 99%

Microbial deposits in the aftermath of the end‐Permian mass extinction: A diverging case from the Mineral Mountains (Utah, USA)

et al. 2015

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“…The SSB is associated with widespread deposition of organicrich sediments in China (Chen et al 2011;Grasby et al 2013a;Sun et al 2015), Japan, Vietnam, Arctic Canada and Far East Russia (Galfetti et al 2008;Shigeta et al 2009;Komatsu et al 2014). However, as noted by Sun et al (2015), the temporal correlation between marine anoxia and the C-isotope record is still unresolved.…”

Section: Introductionmentioning

confidence: 99%

The Smithian–Spathian boundary in North Greenland: implications for extreme global climate changes

et al. 2019

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Smithian–lower Anisian strata in Peary Land, North Greenland, were deposited at ∼45° N on the northern margin of Pangaea in offshore to upper shoreface settings. The well-constrained succession (palynology and ammonite biostratigraphy) documents a remarkable shift from lycophyte spore-dominated assemblages in the upper Smithian to gymnosperm pollen-dominated ones in the lower Spathian in concert with a marked shift of +6 ‰ in δ13Corg. Correlation with other Smithian–Spathian boundary sections that record terrestrial floral changes indicates that the recovery of gymnosperms began earlier in the mid-latitudes of the Southern Hemisphere than in the Northern Hemisphere. The lycophyte-dominated Late Smithian Thermal Maximum is here interpreted as reflecting dry and hot climatic conditions with only brief seasonal precipitation unable to sustain large areas of gymnosperm trees, but able to revive dehydrated lycophytes. This suggests that the Late Smithian Thermal Maximum was a time of widespread aridity, which is also supported by red bed deposition in many areas globally, even as far south as Antarctica. The shift to gymnosperm-dominated vegetation during the cooling across the Smithian–Spathian boundary reflects a change to seasonally more humid climatic conditions favouring gymnosperm recovery, and could have been initiated by increased albedo over land due to the widespread aridity during the Late Smithian Thermal Maximum. The recovery of gymnosperm vegetation would have helped to draw down CO2 from the atmosphere and exacerbate global cooling.

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“…Three microfacies types, including oolitic grainstone (Og), bioclastic grainstone (Bg), and peloidal grainstone (Pg), of this area are different from the other areas ( Table 3 ). Ooids grains are broken from wave and current reworking ( Tucker, 1984 ; Komatsu et al., 2014 ) ( Figure 13 a-b). In addition, the interspace of ooid grains in Og is filled with sparry calcite cement, indicating high-energy and moving water conditions ( Figure 13 a).…”

Section: Discussionmentioning

confidence: 99%

Carbonate microfacies and depositional model of Triassic Pha Kan and Doi Long Formations, Lampang Group, Sukhothai Zone, Northern Thailand

Moonpa

Motanated

2021

Heliyon

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Triassic carbonate rocks of Pha Kan and Doi Long Formations of Lampang Group consist mostly of carbonate successions deposited in the Sukhothai Zone, northern Thailand. These formations are mixed carbonate and siliciclastic sediments and widely exposed in the Lampang area. These deposits are important for the reconstruction of depositional environments and regional correlations of the Triassic carbonate rocks with respect to the volcanic arc of the Sukhothai Zone during the Triassic. The goal of this study is to analyze the lithology and microfacies of the carbonate rocks of the Pha Kan and Doi Long Formations and reevaluate the existing depositional models and carbonate settings. Both formations have diverse skeletal fossils, including foraminifers, sponges, calcimicrobes, calcareous algae, bivalves, echinoderm spines and fragments, ostracods, gastropods, and other fossils. Based on field observations and microfacies analysis, twelve major facies, corresponding to specific depositional environments within a carbonate setting, have been established. The inferred depositional environment is a carbonate platform with a well-developed lagoon, small-scale reefs, and bioclastic and oolitic shoals, as parts of a carbonate ramp. The microfacies and sedimentological study show that this carbonate system was influenced by the nearby volcanic arc. Consequently, our study shows that the Lampang Group in northern Thailand can be correlated with the Lincang Massif of the western Yunnan Province, PRC and the northwestern Lao PDR.

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Lower Triassic mixed carbonate and siliciclastic setting with Smithian–Spathian anoxic to dysoxic facies, An Chau basin, northeastern Vietnam

Cited by 34 publications

References 45 publications

Microbial deposits in the aftermath of the end‐Permian mass extinction: A diverging case from the Mineral Mountains (Utah, USA)

Microbial deposits in the aftermath of the end‐Permian mass extinction: A diverging case from the Mineral Mountains (Utah, USA)

The Smithian–Spathian boundary in North Greenland: implications for extreme global climate changes

Carbonate microfacies and depositional model of Triassic Pha Kan and Doi Long Formations, Lampang Group, Sukhothai Zone, Northern Thailand

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