Eruption and emplacement of a laterally extensive, crystal-rich, and pumice-free ignimbrite (the Cretaceous Kusandong Tuff, Korea)

Sohn, Young Kwan; Son, Moon; Jeong, Jong Ok; Jeon, Yongmun

doi:10.1016/j.sedgeo.2009.04.020

Cited by 26 publications

(12 citation statements)

References 77 publications

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“…Wohletz & Sheridan (1979), Sohn & Chough (1989), Chough & Sohn (1990), Vazquez & Ort (2006), Dellino et al (2008) and Sohn et al (2012) developed facies models for deposition from small-volume PDCs with low densities produced in maar eruptions, and showed how these are related to flow processes. Wilson & Walker (1982), Branney & Kokelaar (1992), Fisher et al (1993), Choux & Druitt (2002) and Sohn et al (2009), among many others, developed transport and depositional models for large-volume PDCs with various particle concentrations. One complication to developing and using these models is that the portion of the flow that is depositing (the depositional system of Fisher 1990) does not necessarily share all characteristics of the portion of the flow that is carrying the particles out from the vent (the transport system).…”

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confidence: 99%

Towards the definition of AMS facies in the deposits of pyroclastic density currents

Ort

Newkirk

Vilas

2014

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Anisotropy of magnetic susceptibility (AMS) provides a statistically robust technique to characterize the fabrics of deposits of pyroclastic density currents (PDCs). AMS fabrics in two types of pyroclastic deposits (small-volume phreatomagmatic currents in the Hopi Buttes volcanic field, Arizona, USA, and large-volume caldera-forming currents, Caviahue Caldera, Neuquén, Argentina) show similar patterns. Near the vent and in areas of high topographical roughness, AMS depositional fabrics are poorly grouped, with weak lineations and foliations. In a densely welded proximal ignimbrite, this fabric is overprinted by a foliation formed as the rock compacted and deformed. Medial deposits have moderate-strong AMS lineations and foliations. The most distal deposits have strong foliations but weak lineations. Based on these facies and existing models for pyroclastic density currents, deposition in the medial areas occurs from the strongly sheared, high-particle-concentration base of a density-stratified current. In proximal areas and where topography mixes this denser base upwards into the current, deposition occurs rapidly from a current with little uniformity to the shear, in which particles fall and collide in a chaotic fashion. Distal deposits are emplaced by a slowing or stalled current so that the dominant particle motion is vertical, leading to weak lineation and strong foliation.

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confidence: 99%

Towards the definition of AMS facies in the deposits of pyroclastic density currents

Ort

Newkirk

Vilas

2014

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“…Interpretation : Lithofacies T1 corresponds to xs or sLT(cr) non‐genetic lithofacies of Branney & Kokelaar (). Its stratigraphic characteristics make this lithofacies similar to the Cretaceous Kusandong Tuff in Korea, a laterally extensive, crystal‐rich, and pumice‐free ignimbrite, generated from shallow‐level fragmentation of magma followed by highly expanded and turbulent flows, able to transport and disperse coarse crystals and lithics over wide areas and to elutriate much of the fine vitric ash (Sohn et al ., , ). Thus, this lithofacies has been interpreted as a crystal‐rich ignimbrite.…”

Section: Resultsmentioning

confidence: 99%

Sedimentological and petrographic evolution of a fluvio‐lacustrine environment during the onset of volcanism: Volcanically‐induced forcing of sedimentation and environmental responses

Capua

Scasso

2020

Sedimentology

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This work focuses on the transition from the Las Leoneras to Lonco Trapial Formations, in the lower part of the Early Jurassic succession of the incipient rift phase of the Cañadon Asfalto Basin (western part of Chubut Province -Patagonia, Argentina). Twenty lithofacies have been identified and grouped into seven facies associations on the basis of field characteristics (sedimentological and lithological) and optical microscope analysis, from two localities representing proximal and distal locations in the basin. The spatial relationship between all the lithofacies provided a four-dimensional reconstruction of the palaeoenvironmental evolution, showing how the original, clastic sedimentation in alluvial/fluvial and lake environments was modified by shortlived volcanic events during three volcanic cycles, and how the environment reacted after the input of huge amounts of volcaniclastics. Progradation of small deltas and subaqueous lobes, retrogradation caused by rising lake levels, and frequent erosion of valleys were typical processes in this environment. When explosive volcanism began, the original tectono-climatic control on sedimentation was replaced by the volcanic control, and the volcanicallyforced sedimentation broke the equilibrium among production, delivery and accumulation of sediments. The nature of the volcanic eruptions and the different propensity of volcanic lithofacies to produce particles of different size and types (lithics, crystals and glass) are also analyzed. The role of volcanism in the production and transport of great volumes of sediments across sedimentary systems needs to be carefully re-examined, and the analysis on the variability in the composition of volcaniclastic deposits must take into account that volcaniclastic particle types may not simply reflect a linear deepening in the dissection of magmatic arcs through time but are often controlled by the style of the eruptions and the lithological variation of the volcanic products.

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“…That is, the positive group appears mainly on the Japanese side, and the negative group appears mostly on the Korean side, except for some zircons of Jindong Formation. One thing to note here is that when Jindong Formation was deposited, the flow direction of paleocurrent indicates the supply of sediment from the east, or the Japanese side [32,[37][38][39]. Therefore, the detrital zircons of the positive group appearing in Jindong Formation may originate from sediment sources in Japan.…”

Section: Negative ε Hf (T) Values Of Cretaceous Zirconsmentioning

confidence: 99%

“…These formations were deposited in either alluvial, fluvial, or lacustrine environments [32]. 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%

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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Eruption and emplacement of a laterally extensive, crystal-rich, and pumice-free ignimbrite (the Cretaceous Kusandong Tuff, Korea)

Cited by 26 publications

References 77 publications

Towards the definition of AMS facies in the deposits of pyroclastic density currents

Towards the definition of AMS facies in the deposits of pyroclastic density currents

Sedimentological and petrographic evolution of a fluvio‐lacustrine environment during the onset of volcanism: Volcanically‐induced forcing of sedimentation and environmental responses

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

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