The Jangsan Formation refined

Chough, Sung Kwun; Kwon, Yongchai; Lee, Hyun Suk; Woo, Jong Inn

doi:10.1007/s12303-022-0006-1

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…Recently, the Jangsan quartzite has been interpreted as a Precambrian formation rather than a Cambrian formation due to the youngest Precambrian detrital zircon ages ranging from 2.0 to 1.8 Ga, with a peak at 2.5 Ga and no Paleozoic detrital zircon [33][34][35][36]. However, this issue is still under debate [37]. The Cambrian sedimentary rocks of the Taebaek group are distributed in the west and consist of the Myobong, Daegi, and Hwajeol formations from bottom to top.…”

Section: Regional Geology and Petrographymentioning

confidence: 99%

The Paleoproterozoic Evolution of Basement Rocks of the Taebaeksan Basin, Korean Peninsula, and Their Correlation to Those of the Paleoproterozoic Massifs in the Korean Peninsula

Lee

Cho

et al. 2023

Minerals

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The Korean Peninsula mainly comprises the Paleoproterozoic Gwanmo, Nangnim, Gyeonggi, and Yeongnam massifs from north to south. The Paleoproterozoic basement is rarely exposed in the Paleozoic Taebaeksan basin, which is located in the northeastern part of the Okcheon belt between the Gyeonggi and Yeongnam massifs. One of the most important issues in the tectonic interpretation of the Korean Peninsula is whether Paleoproterozoic rocks in the Taebaeksan basin have an affinity with those in the Gyeonggi or Yeongnam massifs. To solve this problem, we focused on the petrogenesis of the Imgye gabbroic diorite, Jungbongsan granite, and Jangsan quartzite in the Imgye area of the Taebaeksan basin. The Imgye gabbroic diorite shows mafic to intermediate compositions with slightly enriched LREEs compared to HREEs, slightly positive Rb, K, and Pb anomalies, and negative Ta, Nb, and P anomalies. The Imgye gabbroic diorite formed in a volcanic arc tectonic setting. The geochemical compositions of the Jungbongsan granite show enriched LREEs compared to HREEs with negative Eu anomalies, and reveal strong positive Rb, Th, K, and Pb anomalies with negative Ba, Ta, Nb, Sr, P, Eu, and Ti anomalies. This Jungbongsan granite also formed in an arc tectonic setting like the Imgye gabbroic diorite. LA-ICP-MS zircon age dating of the Imgye gabbroic diorite gives an intrusion age of 1948 ± 21 Ma, whereas SHRIMP U–Pb zircon age dating on the Jungbongsan granite yields an emplacement age of 1873 ± 14 Ma. The εHf(t) values of the Imgye gabbroic diorite are from 3.5 to 9.7, whereas those of the Jungbongsan granite are from −2.9 to 0.6. These data imply that the Imgye gabbroic diorite formed from a depleted mantle in the arc tectonic environment, whereas the Jungbongsan granite formed by reworking pre-existing crust material in the arc environment. The detrital zircons in the Jangsan quartzite show ages ranging from 3.06 to 1.85 Ga, with a peak concentration of ca. 2.5 Ga. Previous studies have suggested that the northern Gyeonggi and Nangnim massifs underwent collision-related magmatism and metamorphism at ca. 1.93–1.90 Ga, and then post-collisional magmatism and metamorphism at ca. 1.89–1.83 Ga, whereas the southern Gyeonggi massif underwent subduction-related magmatism and metamorphism at ca. 1.94–1.92 Ga, and then post-collision-related magmatism and metamorphism at ca. 1.84–1.78 Ga. By contrast, subduction-related events were recognized in the northern Yeongnam massif at ca 2.02–1.96 Ga and 1.90–1.85 Ga. This work, combined with the previous studies, suggests that the Paleoproterozoic basement in the Imgye area of the Taebaeksan basin can be correlated with the Paleoproterozoic basement of the northern Yeongnam massif rather than with those of the Nangnim and Gyeonggi massifs.

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Section: Regional Geology and Petrographymentioning

confidence: 99%

The Paleoproterozoic Evolution of Basement Rocks of the Taebaeksan Basin, Korean Peninsula, and Their Correlation to Those of the Paleoproterozoic Massifs in the Korean Peninsula

Lee

Cho

et al. 2023

Minerals

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“…; 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%

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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Deformation-induced right-side-up pseudo-stratigraphy of the early Paleozoic Joseon Supergroup in the southeastern Danyang area, South Korea

Uhmb,

Ree,

Kim

2024

Geosci J

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The Jangsan Formation refined

Cited by 5 publications

References 11 publications

The Paleoproterozoic Evolution of Basement Rocks of the Taebaeksan Basin, Korean Peninsula, and Their Correlation to Those of the Paleoproterozoic Massifs in the Korean Peninsula

The Paleoproterozoic Evolution of Basement Rocks of the Taebaeksan Basin, Korean Peninsula, and Their Correlation to Those of the Paleoproterozoic Massifs in the Korean Peninsula

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

Deformation-induced right-side-up pseudo-stratigraphy of the early Paleozoic Joseon Supergroup in the southeastern Danyang area, South Korea

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