Recognition of the “Great Unconformity” in the eastern Sino-Korean Block: Insights from the Taebaek Group, Korea

Lee, Jeonghyun; Oh, Min-Kyu; Choi, Taejin

doi:10.1016/j.precamres.2021.106363

Cited by 8 publications

(3 citation statements)

References 81 publications

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“…This three-fold succession can be correlated with coeval units in the Taebaek Group (i.e., (i) Myeonsan, (ii) Myobong, and (iii) Daegi formations) (Figs. 13 and 14) (Kwon et al, 2006;Chough, 2013;J.-H. Lee et al, 2021), as well as in North Korea (Kobayashi, 1966b;Om et al, 1996). In contrast, Precambrian strata in the Sino-Korean Block differ widely in lithology and age from place to place.…”

Section: Regional Lithostratigraphic Correlationmentioning

confidence: 99%

“…; Y.I. Lee et al, 2012Chough et al, 2016Chough et al, , 2022J.-H. Lee et al, 2021;Woo et al, 2023) and the difficulties of obtaining stratigraphic and lithologic data (Kobayashi, 1966a;. The unfossiliferous quartz sandstone-dominated Jangsan Formation had traditionally been considered the basal Cambrian unit of the Taebaek Group (e.g., Kobayashi, 1966a; D.K.…”

Section: Introductionmentioning

confidence: 99%

“…This new lithostratigraphic scheme allows to compare the basal Taebaek Group with coeval strata in the Sino-Korean Block. Resolution of the stratigraphic relationships within the basal Taebaek Group reveals the broad transgressive pattern of the Great Unconformity in the Sino-Korean Block (e.g., Kwon et al, 2006;J.-H. Lee et al, 2021) and its implications for the effects of the Cambrian Explosion in the region (e.g., Yoon et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

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Lithostratigraphic revision of the siliciclastic-dominated basal Taebaek Group (lower–middle Cambrian), Eastern Korea

Choi

Lee

et al. 2023

Episodes

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The lithostratigraphic relationships among the basal Taebaek Group, including the Jangsan, Myeonsan, and Myobong formations, have been controversial until recently. It has long been assumed that the Jangsan and Myeonsan formations are lateral equivalents that are both conformably overlain by the Myobong Formation. However, recent studies have shown that the Jangsan is Precambrian in age and is unconformably overlain by the Cambrian succession, whereas the Myeonsan is a Cambrian unit. Accordingly, this study proposes a revised lithostratigraphic framework of the basal Taebaek Group. The Myeonsan Formation (Cambrian Age 3?) is defined here as a basal Cambrian succession consisting of a basal conglomerate and coarse-grained immature sandstone with detrital heavy minerals that unconformably overlies Precambrian basement. The Myobong Formation (~Cambrian Age 4-Wuliuan) is a fine-grained unit that conformably overlies the Myeonsan Formation. The Myobong is subdivided as follows: Seokpo Member of lenticular cross-laminated sandstone and siltstone; Daehyun Member of laterally continuous alternations of thin-bedded sandstone and siltstone with some carbonate-filled channels; Gurae Member of bioturbated sandstone. The Myeonsan Formation is comparable with lowermost Cambrian units in North China that formed during second-order transgression. Further sealevel rise led to the deposition of the Myobong Formation and its correlative units in North China.

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Section: Regional Lithostratigraphic Correlationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Lithostratigraphic revision of the siliciclastic-dominated basal Taebaek Group (lower–middle Cambrian), Eastern Korea

Choi

Lee

et al. 2023

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The early–middle Cambrian siliciclastic tide‐dominated succession in eastern Korea

Oh,

Choi,

Lee

2024

The Depositional Record

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The basal Taebaek Group (Myeonsan and Myobong formations) illustrates second‐order transgression on the eastern Sino‐Korean Block during the early–middle Cambrian (Stage 3?–Wuliuan). The irregular palaeotopography of Precambrian basement led to the development of localised alluvial fans and fan deltas. As transgression continued, tidally influenced estuarine and associated shallow subtidal flats developed. Continued transgression resulted in a relatively deep subtidal environment, with postulated carbonate shoals serving as barriers. Stacking of facies indicates a general deepening‐upward trend, transitioning from terrestrial–nearshore to marine environments dominated by tidal effects. The study area subsequently experienced shallowing, leading to the emergence of tidal inlet and dune environments. Siliciclastic input was attenuated, facilitating the development of carbonate shoal complexes. The overall transgressive succession of the basal Taebaek Group aligns with similar sequences observed in the Sino‐Korean Block and western Laurentia, where the lowermost Cambrian strata which formed in various depositional environments on the uneven basement rocks were followed by extensive tide‐dominated siliciclastic successions. These successions were then overlain by epeiric carbonate platforms that developed synchronously across the area as siliciclastic input diminished with the continued transgression. This comparison demonstrates that the transgressive sequences in the Sino‐Korean Block and western Laurentia can be understood within a framework that explains how extensive Cambrian carbonate platforms initially developed due to a second‐order eustatic sea‐level rise during the Cambrian greenhouse period.

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Expanded deepwater euxinia recorded in the Ediacaran–Cambrian boundary interval in South China

Yang

Zhou

2022

Journal of Asian Earth Sciences

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Recognition of the “Great Unconformity” in the eastern Sino-Korean Block: Insights from the Taebaek Group, Korea

Cited by 8 publications

References 81 publications

Lithostratigraphic revision of the siliciclastic-dominated basal Taebaek Group (lower–middle Cambrian), Eastern Korea

Lithostratigraphic revision of the siliciclastic-dominated basal Taebaek Group (lower–middle Cambrian), Eastern Korea

The early–middle Cambrian siliciclastic tide‐dominated succession in eastern Korea

Expanded deepwater euxinia recorded in the Ediacaran–Cambrian boundary interval in South China

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