Welded tuff infilling a volcanic vent at Weolseong, Republic of Korea

Reedman, A. J.; Park, Ki Hwa; Merriman, R. J.; Kim, Seon Eok

doi:10.1007/bf01080448

Cited by 42 publications

(26 citation statements)

References 9 publications

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“…Our interpretation is in accordance with the earlier inference that the IWT would be the source of the CVF (Reedman et al, 1987). It can therefore be concluded that the IWT is the source of A4 member (Figure 9).…”

Section: Source Implicationsupporting

confidence: 81%

“…Indeed, the IWT yielded sericite K/Ar age of 65.1 ± 1.8 Ma, statistically contemporaneous to the second eruptive cycle. In particular, Reedman et al (1987) proposed that the IWT would be the source for the CVF.…”

Section: Introductionmentioning

confidence: 99%

“…The CVF lies within a broad structural basin regarded as a down sag caldera (Figure 1). According to Reedman et al (1987), the CVF was produced by a sequence of subaerial explosive silicic volcanism that involved an emplacement of thick ignimbrites intercalated with volcanoclastic sedimentary rocks.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic Fabrics and Source Implications of Chisulryoung Ignimbrites, South Korea

Hong

Doh

et al. 2016

Front. Earth Sci.

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The anisotropy of magnetic susceptibility (AMS) of late Cretaceous ash-flow tuffs in Chisulryoung Volcanic Formation, southeastern Korea was studied to define the primary pyroclastic flow azimuth. AMS data revealed a dominant oblate fabric with a tight clustering of k 3 (minimum axis of magnetic susceptibility) and shallow dispersal of k 1 (maximum axis of magnetic susceptibility) and k 2 (intermediate axis of magnetic susceptibility). Dominance of oblate fabrics indicates clast imbrications imposed by compaction and welding. Flow azimuth inferred from AMS data indicates the nearby intrusive welded tuff (IWT) as the source of calderas for ignimbrites. Such an inference is supported by geologic investigations, in which the IWT displays eutaxitic textures nearly parallel to its subvertical contacts. The results are compatible with a unique prolate fabric and an anomalously high inclination observed for the IWT, possibly produced by rheomorphic flows as the welded tuff is squeezed along the rough-surfaced dyke walls due to agglutination.

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Section: Source Implicationsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

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Magnetic Fabrics and Source Implications of Chisulryoung Ignimbrites, South Korea

Hong

Doh

et al. 2016

Front. Earth Sci.

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“…Ragan and Sheridan (1972) found that the rotated lithic clasts and rotated segments of broken fiamme might be the results of post emplacement loading. Wolff and Wright (1981) further proposed that lineation of high-grade ignimbrites are diagnostic of post-depositional "re-flowing" in contrast to the idea of Chapin and Lowell (1979) and Reedman at al. (1987) that consider these features as formed during initial deposition.…”

Section: Ignimbritic Textures: a Reviewmentioning

confidence: 94%

Paleoproterozoic felsic volcanism of the Tapajós Mineral Province, Southern Amazon Craton, Brazil

Roverato

Giordano

Echeverri-Misas

et al. 2016

Journal of Volcanology and Geothermal Research

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Amazonian rocks record one amongst the most complete and best-preserved Paleoproterozoic magmatic episodes on Earth. The present contribution documents the extremely well preserved paleoproterozoic architecture of a series of felsic rocks found in the Tapajós Mineral Province (TMP), located in the western part of Pará state, southern Amazon Craton, north of Brazil. These rocks are the first to be investigated to comprehend, based on their textural evidences, their emplacement mechanisms. Textural characterization allowed to identify three main facies with, as following reported, 1) chaotic ("Breccia") group, 2) eutaxitic ("Eutax") group and 3) parataxitic ("Paratax") group vitrophyric texture. Given the superb preservation of our samples, the investigated rocks are grouped, according to their grade of welding, into a wide variety of lithofacies from very low-grade to high-grade and rheomorphic ignimbrites. In the "paratax group" strong similarities with banding in lava flows are observed. Based on the presented data we discuss the effusive or explosive origin of the observed flow mechanisms.

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“…According to Reedman et al (1987), the CVF was formed by two sequential cycles of subaerial explosive silicic volcanic activities in which an emplacement of thick ash-flows intercalated with volcanoclastic sedimentary rocks. It is typically a basin, circular in form whose underlying sedimentary rocks inclined with centripetal dips (Figure 1).…”

Section: Geologymentioning

confidence: 99%

Paleomagnetism and U-Pb geochronology of the late Cretaceous Chisulryoung Volcanic Formation, Korea: tectonic evolution of the Korean Peninsula

Jeong

Doh

et al. 2015

Earth Planet Sp

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Late Cretaceous Chisulryoung Volcanic Formation (CVF) in southeastern Korea contains four ash-flow ignimbrite units (A1, A2, A3, and A4) and three intervening volcano-sedimentary layers (S1, S2, and S3). Reliable U-Pb ages obtained for zircons from the base and top of the CVF were 72.8 ± 1.7 Ma and 67.7 ± 2.1 Ma, respectively. Paleomagnetic analysis on pyroclastic units yielded mean magnetic directions and virtual geomagnetic poles (VGPs) Our best estimates of the paleopoles for A1, A3, and A4 are in remarkable agreement with the reference apparent polar wander path of China in late Cretaceous to early Paleogene, confirming that Korea has been rigidly attached to China (by implication to Eurasia) at least since the Cretaceous. The compiled paleomagnetic data of the Korean Peninsula suggest that the mode of clockwise rotations weakened since the mid-Jurassic. Such interesting variation of vertical rotations in the Korean Peninsula might result from the strike-slip motions of major faults developed in East Asia (the Tancheng-Lujiang fault to the northwest and the Korea-Taiwan strait fault to the southeast), near-field tectonic forcing of the subducting Pacific Plate beneath the Eurasian Plate, and far-field expressions of the India-Asia collision.

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Welded tuff infilling a volcanic vent at Weolseong, Republic of Korea

Cited by 42 publications

References 9 publications

Magnetic Fabrics and Source Implications of Chisulryoung Ignimbrites, South Korea

Magnetic Fabrics and Source Implications of Chisulryoung Ignimbrites, South Korea

Paleoproterozoic felsic volcanism of the Tapajós Mineral Province, Southern Amazon Craton, Brazil

Paleomagnetism and U-Pb geochronology of the late Cretaceous Chisulryoung Volcanic Formation, Korea: tectonic evolution of the Korean Peninsula

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