Newly identified Towada-Chuseri tephra from lacustrine deposits in Lake Aoki, Nagano Prefecture, central Japan

大輔, 石村; 佑一, 吉永; 圭太郎, 山田; 強, 原口; 晋次, 遠田

doi:10.4116/jaqua.56.265

Cited by 2 publications

(6 citation statements)

References 10 publications

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“…We sampled an AOK sample from piston core AOK15‐3 in Ishimura et al . (). The AOK15‐3 core was drilled in Lake Aoki in central Japan.…”

Section: Resultssupporting

confidence: 86%

“…We sampled ONM samples from the Geoslicer core ONM‐GS9 in Ishimura et al . (). Core ONM‐GS9 was drilled at the bottom of an excavated trench in a coastal lowland on the southern Sanriku Coast.…”

Section: Resultsmentioning

confidence: 97%

“…Based on the refractive indices and glass composition, To‐Cu (total thickness of 0.1 cm) was previously identified interbedded within organic silt and clay (Fig. ; Ishimura et al ., ). In this study, we observed the glass morphology but used the refractive index and glass composition from Ishimura et al .…”

Section: Resultsmentioning

confidence: 99%

“…In this study, we observed the glass morphology but used the refractive index and glass composition observations from Ishimura et al . ().…”

Section: Resultsmentioning

confidence: 99%

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Proximal–distal fall deposit correlation of VEI‐5 tephra (Towada‐Chuseri) from Towada volcano, northeast Japan

Ishimura

Hiramine

2019

J Quaternary Science

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A tephra layer offers an isochronous surface in sediments, thus serving as a key bed and/or an age marker. Recent high-resolution sediment research (e.g. varved sediments) has revealed optically invisible tephra fingerprints and provided high-precision tephra ages. However, a tephra-based correlation cannot succeed without detailed knowledge of the tephra characteristics in a proximal area to correlate with tephra in high-resolution sediments in remote areas. Here we documented the detailed characteristics of Towada-Chuseri (To-Cu) tephra, which is associated with the Middle Holocene volcanic explosivity index 5 eruption of Towada volcano, northeast Japan. We used To-Cu tephra samples to achieve the proximal-distal correlation of three members: Chuseri pumice (Cu), Kanegasawa pumice (Kn) and Utarube ash (Ut). These distal occurrences correlate with proximal To-Cu tephra based on volcanic glass morphology and refractive index, as well as on major element composition of volcanic glass shards. Refractive indices allow the preliminary correlation of each member, and major element composition helps in distinguishing Ut from the other members. Glass morphology provides additional support. These correlations reveal that To-Cu, especially Cu, covered central to northeast Japan while confirming that To-Cu is the representative tephra in the Middle Holocene of the Tohoku region.

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“…We sampled an AOK sample from piston core AOK15‐3 in Ishimura et al . (). The AOK15‐3 core was drilled in Lake Aoki in central Japan.…”

Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

“…In this study, we observed the glass morphology but used the refractive index and glass composition observations from Ishimura et al . ().…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Proximal–distal fall deposit correlation of VEI‐5 tephra (Towada‐Chuseri) from Towada volcano, northeast Japan

Ishimura

Hiramine

2019

J Quaternary Science

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“…While there is some overlap in their glass composition, Ishimura and Hiramine (2020) have shown that the units are separable on the basis of shard morphology and major element geochemistry, especially Ut, the youngest unit which is the product of phreatic eruptions. On the basis of previous investigations, To‐Cu dispersal was mainly towards the south of Towada, and tephra has been identified in various sedimentary archives, the most distal occurrence being in Lake Suigetsu ~700 km southwest of the vent (Hirose et al ., 2014; Ishimura et al ., 2017; Kariya et al ., 2016; McLean et al ., 2018). The GST‐314 tephra exhibits a homogeneous glass composition which cannot be separated from the Cu and Kn pumices and which is also similar to the records in Lake Suigetsu (Fig.…”

Section: Resultsmentioning

confidence: 99%

~5.9 cal ka bp Towada‐Chuseri tephra from Towada volcano: a mid‐Holocene marker layer from Japan to northeast China

Sun

Plunkett

Zhu

et al. 2021

J Quaternary Science

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Far‐travelled ash layers from explosive volcanic eruptions can provide invaluable marker horizons for dating and correlating regional to global sedimentary archives. Here, we present a new cryptotephra associated with the ~5.9 cal ka bp Towada‐Chuseri eruption (To‐Cu) in a peat sediment record from northeast China. This tephra exhibits a rhyolitic glass composition that can be distinguished from other widespread tephra layers around the region of Japan and northeast China. Our findings extend the known range of this ash significantly, making it now traceable about 1200 km from its source, Towada volcano, Japan. Notably, this tephra provides an important isochron for synchronising palaeoenvironmental studies during the mid‐Holocene period from the western Pacific, central Japan, Japan Sea and northeast China.

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Newly identified Towada-Chuseri tephra from lacustrine deposits in Lake Aoki, Nagano Prefecture, central Japan

Cited by 2 publications

References 10 publications

Proximal–distal fall deposit correlation of VEI‐5 tephra (Towada‐Chuseri) from Towada volcano, northeast Japan

Proximal–distal fall deposit correlation of VEI‐5 tephra (Towada‐Chuseri) from Towada volcano, northeast Japan

~5.9 cal ka bp Towada‐Chuseri tephra from Towada volcano: a mid‐Holocene marker layer from Japan to northeast China

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