Nature and evolution of the Cretaceous basins in the eastern margin of Eurasia: A case study of the Gyeongsang Basin, SE Korea

Lee, Tae Ho; Park, Kye‐Hun; Yi, Keewook

doi:10.1016/j.jseaes.2018.07.004

Cited by 51 publications

(15 citation statements)

References 54 publications

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“…Age . The Daegu Formation was correlated to the Haman Formation based on the bulk composition of lithology, which is known as the Albian based on radiometric dating of the overlying Hakbong basalt and underlying formations 10 , 11 . Thus, the Daegu Formation is considered Albian in age.…”

Section: Resultsmentioning

confidence: 99%

The first possible choristoderan trackway from the Lower Cretaceous Daegu Formation of South Korea and its implications on choristoderan locomotion

Lee

Kong

Jung

2020

Sci Rep

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Here we report a new quadrupedal trackway found in the Lower Cretaceous Daegu Formation (Albian) in the vicinity of Ulsan Metropolitan City, South Korea, in 2018. A total of nine manus-pes imprints show a strong heteropodous quadrupedal trackway (length ratio is 1:3.36). Both manus and pes tracks are pentadactyl with claw marks. The manus prints rotate distinctly outward while the pes prints are nearly parallel to the direction of travel. The functional axis in manus and pes imprints suggests that the trackmaker moved along the medial side during the stroke progressions (entaxonic), indicating weight support on the inner side of the limbs. There is an indication of webbing between the pedal digits. These new tracks are assigned to Novapes ulsanensis, n. ichnogen., n. ichnosp., which are well-matched not only with foot skeletons and body size of Monjurosuchus but also the fossil record of choristoderes in East Asia, thereby N. ulsanensis could be made by a monjurosuchid-like choristoderan and represent the first possible choristoderan trackway from Asia. N. ulsanensis also suggests that semi-aquatic choristoderans were capable of walking semi-erect when moving on the ground with a similar locomotion pattern to that of crocodilians on land. South Korea has become globally famous for various tetrapod footprints from Cretaceous strata 1 , among which some clades such as frogs 2 , birds 3 and mammals 4 have been proved for their existences only with ichnological evidence. Recently, a new quadrupedal trackway with a pronounced heteropody (sensu stricto) 5 was discovered in the Daegu Formation (Albian, Lower Cretaceous), Ulsan City, which consists of nine manus-pes sets (Fig. 1). Both manus and pes are pentadactyl with sharp claw marks. They look different from any known quadrupedal dinosaur footprints because there is a clear indication of webbing between the pedal digits. During the Mesozoic, the webbed footprints have been occasionally reported in various quadrupedal animals such as freshwater turtles 6 , amphibians 7 , crocodyliforms 8 , and pterosaurs 9. However, new footprints differ from their tracks in morphology and appear to belong to that of other clade. Therefore, the purpose of this paper is to describe the new type of tracks and to investigate the possible trackmaker by comparing their ichnological features with skeletal ones. In addition, the trackmaker's locomotory posture on land was inferred from the trackway pattern. Results Systematic ichnology. Ichnogenus Novapes ichnogen. nov. (Figs. 2, 3). Type species. Novapes ulsanensis ichnogen. et ichnosp. nov., by monotypy and designation herein. Diagnosis. Quadrupedal tracks with a pronounced heteropody; pentadactyl manus impression with claw marks and semi-symmetrical outline, wider than longer; divergence between digit I and V imprints ranges 180° to 210°; the digit IV imprint slightly longer than digit II; entaxonic; pentadactyl pes impression with claw marks and asymmetrical outline (i.e., lateral digits are more developed), longer than wide; webbing bet...

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Section: Resultsmentioning

confidence: 99%

The first possible choristoderan trackway from the Lower Cretaceous Daegu Formation of South Korea and its implications on choristoderan locomotion

Lee

Kong

Jung

2020

Sci Rep

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“…Therefore, samples were selected for sedimentary layers that are expected to have many detrital zircons of Cretaceous age. For the Gyeongsang Basin in Korea, we used the Hayang Group samples whose detrital zircon U-Pb ages have already been reported [19]; two in the Silla Conglomerate (Sila14, KU5) and one in each of the Chilgok (CG-1), Haman (HA-1), and Jindong (JD-2-1) Formations. For U-Pb age measurement and Hf isotope analysis, we used two sandstone samples from the upper Cretaceous Himenoura Group (Kuma-5, Kuma-6-1) and two samples from the mid Cretaceous Goshoura Group (Kuma-449 and Kuma-450), Kyushu, SW Japan, collected during the IGCP-507 field trip (Figure 1) [24].…”

Section: Samples and Analytic Methodsmentioning

confidence: 99%

“…In this study, Hf isotope composition was also analyzed from detrital zircons of Hayang Group in Gyeongsang basin, Korea (Table A3), which had already analyzed U-Pb ages [19]. The detrital zircons of the Hayang Group have a much wider range of U-Pb ages [19] than those of the Goshoura and Himenoura groups. The ε Hf (t) values of detrital zircons of the Hayang Group show significant changes with geological age.…”

Section: Hf Isotopic Compositions Of the Detrital Zircons From The Hayang Group Koreamentioning

confidence: 99%

“…Since this time, there were several cyclic igneous activities called Pacific-type orogeny, and arc-related pull-apart sedimentary basins developed within the Japanese Islands [5,13]. As a result, [19] and the Amakusa Islands (after Saito et al 2010) [23] The Himenoura Group extends from northeast to southwest and is exposed to the northeast of the Amakusa Islands. It is unconformable overlying the Higo plutonic and metamorphic rocks and the Goshoura Group and unconformably overlained by the Paleogene Miroku Group.…”

Section: Introduction and General Geologymentioning

confidence: 99%

“…In the lower layers of the Gyeongsang Basin, sediments were supplied by waters flowing from the west and northwest [33][34][35][36], but sediments constituting the upper layers were supplied from streams flowing from the east, the direction of the Japanese islands connected to the Korean Peninsula at the time [32,[37][38][39]. The maximum depositional ages of the four formations constituting the Hayang Group defined from the youngest U-Pb age populations of detrital zircons are as follows; 109 Ma for the Chilgok Formation, 106 Ma for the Silla Conglomerate, 105 Ma for the Haman Formation, and 100 Ma for the Jindong Formation [19].…”

Section: Introduction and General Geologymentioning

confidence: 99%

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Detrital Zircon U-Pb Geochronology and Hf Isotope Geochemistry of the Hayang Group, SE Korea and the Himenoura and Goshoura Groups, SW Japan: Signs of Subduction-Related Magmatism after a Long Resting Period

Lee

Park

2020

Minerals

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There was a hiatus in magmatism in Korea and Japan, located on the eastern continental margin of Asia, during a period of about 40 Ma from 160 Ma to 120 Ma. The cause of the resumption of magmatism since then is not yet well understood. In this study, we analyzed the Hf isotope composition of detrital zircons in the Cretaceous sediments of Korea (Hayang Group) and Japan (Goshoura and Himenoura groups) to investigate the tectonic evolution of eastern Asia in the Early Cretaceous period. εHf(t) in Cretaceous zircons from Japanese samples values from +8.2 to +0.1, suggesting that magmatism was sourced from the depleted juvenile materials, which is compatible with ridge subduction and subsequent melting of the young oceanic crust. εHf(t) values from Cretaceous zircons in the Hayang Group are negative, except for the Jindong Formation, which had a sediment supply from Japan, indicating that the old continental crust material of the Korean Peninsula was included in the magma generation. The detrital zircons of this study exhibit a depleted isotopic character at the beginning of subduction-related magmatism in Permian and Early Cretaceous, and then gradually change to a more enriched composition. This trend may be a typical example of the Pacific-type orogenic cycle.

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Ordovician continental arc magmatism in the Tam Ky‐Phuoc Son Suture Zone, Central Indochina Block, Southeast Asia

et al. 2022

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The Indochina Block is considered as a part of the Indian and Australian margins of Gondwana, and the Tam Ky-Phuoc Son Suture Zone (TPSZ) lies in its central region as the boundary between the Truong Son Belt and Kon Tum Massif (KTM). However, the early Palaeozoic tectonic nature and timing of magmatism within the TPSZ are still controversial. To tackle the issue, we present herein the zircon U-Pb ages with their trace-element compositions of five dioritic-granitic granitoids in the TPSZ.U-Pb age dating of magmatic zircons from them suggests emplacement ages of ca. 447-450 Ma. Whole-rock geochemistry of the samples shows low TiO 2 contents (0.36-1.18 wt%) and Mg# (42.04-53.07). They display enrichment in light rare earth elements ([La/Yb] N = 4.10-15.19), pronounced negative Nb, Ta and Ti anomalies relative to the chondrite-normalized rare earth element patterns and primitive mantlenormalized trace-element distribution diagrams. The whole-rock geochemical characteristics together with zircon trace-element compositions from the same samples revealed their petrogenesis of a continental arc tectonic setting. Combining the results from this study together with available data from the TPSZ and its neighbouring units, we suggest accretionary orogenesis was responsible for generation of the Ordovician magmatic arc in the KTM, which will provide better understanding of the Early Palaeozoic evolution of the eastern Indochina Block.

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Nature and evolution of the Cretaceous basins in the eastern margin of Eurasia: A case study of the Gyeongsang Basin, SE Korea

Cited by 51 publications

References 54 publications

The first possible choristoderan trackway from the Lower Cretaceous Daegu Formation of South Korea and its implications on choristoderan locomotion

The first possible choristoderan trackway from the Lower Cretaceous Daegu Formation of South Korea and its implications on choristoderan locomotion

Detrital Zircon U-Pb Geochronology and Hf Isotope Geochemistry of the Hayang Group, SE Korea and the Himenoura and Goshoura Groups, SW Japan: Signs of Subduction-Related Magmatism after a Long Resting Period

Ordovician continental arc magmatism in the Tam Ky‐Phuoc Son Suture Zone, Central Indochina Block, Southeast Asia

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