Characteristics of the late Quaternary tephra layers in the East/Japan Sea and their new occurrences in western Ulleung Basin sediments

Park, Myong-Ho; Kim, Il-Soo; Shin, Jae-Bong

doi:10.1016/s0025-3227(03)00287-1

Cited by 31 publications

(15 citation statements)

References 13 publications

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“…By now, distal tephra and cryptotephra research has been successfully undertaken in many regions including Greenland (e.g., Abbott et al, 2012;Abbott and Davies, 2012;Coulter et al, 2012;Bourne et al, 2015b); North Atlantic (e.g., Lacasse and Garbe-Schönberg, 2001;Brendryen et al, 2011;Gudmundsdóttir et al, 2012;Blockley et al, 2014;Davies et al, 2014;Griggs et al, 2014;Voelker and Haflidason, 2015); European mainland (e.g., Caron et al, 2010;Sulpizio et al, 2010a,b;Lane et al, 2011Lane et al, , 2015Lawson et al, 2012); Mediterranean (Siani et al, 2004;Wulf et al, 2004Wulf et al, , 2008Wulf et al, , 2012Paterne et al, 2008;Zanchetta et al, 2011;Albert et al, 2012Albert et al, , 2015Bourne et al, 2015a;Çagatay et al, 2015;Wutke et al, 2015); in and around Japan (e.g., Park et al, 2003;Matsu'ura et al, 2011;Okuno et al, 2011;Smith et al, 2011bSmith et al, , 2013Lim et al, 2013); New Zealand (Shane, 2000;Alloway et al, 2005;Shane et al, 2006;Allan et al, 2008;Holt et al, 2011;Shane and Wright, 2011;…”

Section: Record Of Explosive Eruptions: Identification and Dating Of mentioning

confidence: 99%

Tephra without Borders: Far-Reaching Clues into Past Explosive Eruptions

2015

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This review is intended to highlight recent exciting advances in the study of distal (>100 km from the source) tephra and cryptotephra deposits and their potential application for volcanology. Geochemical correlations of tephra between proximal and distal locations have extended the geographical distribution of tephra over tens of millions square kilometers. Such correlations embark on the potential to reappraise volume and magnitude estimates of known eruptions. Cryptotephra investigations in marine, lake, and ice-core records also give rise to continuous chronicles of large explosive eruptions many of which were hitherto unknown. Tephra preservation within distal ice sheets and varved lake sediments permit precise dating of parent eruptions and provide new insight into the frequency of eruptions. Recent advances in analytical methods permit an examination of magmatic processes and the evolution of the whole volcanic belts at distances of hundreds and thousands of kilometers from source. Distal tephrochronology has much to offer volcanology and has the potential to significantly contribute to our understanding of sizes, recurrence intervals and geochemical make-up of the large explosive eruptions.

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Section: Record Of Explosive Eruptions: Identification and Dating Of mentioning

confidence: 99%

Tephra without Borders: Far-Reaching Clues into Past Explosive Eruptions

2015

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“…Organic carbon and biogenic methane prevail in the deep sediments of the Ulleung basin [ Lee et al , 2008; Ryu et al , 2009]. Sediments are mainly sandy soils in the shelf (massive sand and bioturbated sand) and clayey soils in the continental slope (laminated mud, slightly laminated mud, bioturbated mud, homogeneous mud with distinct tephra layers) [ Bahk et al , 2000; Lee et al , 1993; Park et al , 2003]. Dominant clay minerals in the Miocene shales and sandstones of the Ulleung Basin are illite and smectite, with some kaolinite and chlorite presumably resulting from hydrothermal events [ Hillier et al , 1996].…”

Section: Introductionmentioning

confidence: 99%

A pressure core based characterization of hydrate-bearing sediments in the Ulleung Basin, Sea of Japan (East Sea)

Yun

Lee

et al. 2011

J. Geophys. Res.

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[1] The physical characteristics of hydrate-bearing sediments sampled by pressure coring from the Ulleung Basin in the Sea of Japan (East Sea) were investigated using an instrumented chamber capable of testing recovered natural sediments that have never left the methane hydrate stability field. The heterogeneous distribution of segregated hydrate veins and lens structures in sediments results in highly variable geophysical and geomechanical properties. The scaled production test was conducted by controlled depressurization of pressure cores while dissociation and gas production were concurrently monitored using various sensors in the instrumented chamber. The hydrate saturation was estimated to be ∼19.5% in the pore space. Data show a sharp reduction in sediment shear and bulk stiffnesses during hydrate dissociation. Relatively fast gas migration was observed, probably along high-conduction planes left behind as hydrate veins dissociated. The spatial distribution of hydrates in sediment was analyzed based on 3-D image processing. The phenomena relevant to the production test and sampling effects during pressure coring are discussed.

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“…Many seismic, stratigraphic and sedimentological studies of Quaternary sediments have been carried out in an effort to understand the paleoenvironmental changes in the Ulleung Basin of the East Sea (Japan Sea) (Lee et al 1996;Chough et al 2000;Kim et al 2000;Park et al 2003;Lee et al 2004). However, only a few geochemical studies have been conducted in this basin (Park et al 2005;Kim et al 2006) that characterize and identify shallow gas and organic matters.…”

Section: Introductionmentioning

confidence: 99%

Geochemical characterization of the organic matter, pore water constituents and shallow methane gas in the eastern part of the Ulleung Basin, East Sea (Japan Sea)

Kim

Park²,

Tsunogai

et al. 2007

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Geochemical analyses of sediments, pore water and headspace gas of the piston cores taken from the eastern part of Ulleung Basin of the East Sea (Japan Sea) were carried out to assess the origin of the sedimentary organic matter and interstitial fluid. Several tephra layers within the core are identified as the Ulleung‐Oki (10.1 ka), the Aira‐Tanzawa (23 ka) and the Ulleung‐Yamato (30.9 ka) tephras. With the exception of these volcanic layers, the cores consist predominantly of muddy sediments that contain >0.5% total organic carbon. Atomic C/N ratios and δ13Corg values suggest that the organic matter originated from marine algae rather than from land vascular plants, whereas Rock‐Eval pyrolysis suggests that the organic matter is thermally immature and comes from a land vascular plant (Type III). These conflicting results seem to be caused by the heavy oxidization of the marine organic matter. Sulphate concentration profiles of pore waters show strongly linear depletion (r2 > 0.97) with sediment depth. The estimated sulphate–methane interface (SMI) depth using the sulphate concentration gradient was nearly 3.5 m below seafloor (mbsf) in the southern part of the study area, and deeper than 6 mbsf in the northern part of the area. The difference in SMI depths is likely associated with the amount of the methane flux. The methane concentration below the SMI in the two southern cores increases rapidly, implying the occurrence of methanogenesis and anaerobic methane oxidation (AMO). In contrast, the two northern cores have a low methane concentration below the SMI. values measured from all cores were in the range of −83.5 to −69.5‰, which suggests that the methane derives from a methanogenic microbe. values become decreased toward SMI, but increased below SMI; therefore, has eventually the minimum value near the SMI. The values are also decreased when the methane concentration is increased. These phenomena support the typical occurrence of AMO in the study area.

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Characteristics of the late Quaternary tephra layers in the East/Japan Sea and their new occurrences in western Ulleung Basin sediments

Cited by 31 publications

References 13 publications

Tephra without Borders: Far-Reaching Clues into Past Explosive Eruptions

Tephra without Borders: Far-Reaching Clues into Past Explosive Eruptions

A pressure core based characterization of hydrate-bearing sediments in the Ulleung Basin, Sea of Japan (East Sea)

Geochemical characterization of the organic matter, pore water constituents and shallow methane gas in the eastern part of the Ulleung Basin, East Sea (Japan Sea)

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