Abstract
Lake Ichi-no-Megata is a maar in the Oga Peninsula, which is connected with the western side of Honshu Island, NE Japan. A 37-m long sediment core (IMG06) obtained from the center of the lake contains five fine ash layers. Stratigraphic positions in the core provide ages of five ashes to be 30, 21, 17, 7.3, and 1.0 cal ka BP, respectively. These layers are correlated with Aira-Tn (AT), Daisen-Kusatanihara (D-KsP), Asama-Kusatsu (As-K), Kikai-Akahoya (K-Ah) and Baitoushan-Tomakomai (B-Tm) tephras in ascending order, based on stratigraphy and petrographic characteristics such as grain assemblages, refractive indices, and major element compositions of glass shards. Although the AT, K-Ah and B-Tm tephras have been well known as widespread tephras, this study finds that the D-KsP, As-K and K-Ah tephras have more extensive distributions than the previous studies estimated. The D-KsP and As-K tephras have the potential to become useful time-markers in and around the Sea of Japan between the AT and K-Ah tephras.
| Original language | English |
|---|---|
| Pages (from-to) | 270-277 |
| Number of pages | 8 |
| Journal | Quaternary International |
| Volume | 246 |
| Issue number | 1-2 |
| DOIs | |
| Publication status | Published - 2011 Dec 20 |
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ASJC Scopus subject areas
- Earth-Surface Processes
Cite this
Widespread tephras in sediments from lake Ichi-no-Megata in northern Japan : Their description, correlation and significance. / Okuno, Mitsuru; Torii, Masayuki; Yamada, Kazuyoshi; Shinozuka, Yoshitsugu; Danhara, Tohru; Gotanda, Katsuya; Yonenobu, Hitoshi; Yasuda, Yoshinori.
In: Quaternary International, Vol. 246, No. 1-2, 20.12.2011, p. 270-277.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Widespread tephras in sediments from lake Ichi-no-Megata in northern Japan
T2 - Their description, correlation and significance
AU - Okuno, Mitsuru
AU - Torii, Masayuki
AU - Yamada, Kazuyoshi
AU - Shinozuka, Yoshitsugu
AU - Danhara, Tohru
AU - Gotanda, Katsuya
AU - Yonenobu, Hitoshi
AU - Yasuda, Yoshinori
PY - 2011/12/20
Y1 - 2011/12/20
N2 - Lake Ichi-no-Megata is a maar in the Oga Peninsula, which is connected with the western side of Honshu Island, NE Japan. A 37-m long sediment core (IMG06) obtained from the center of the lake contains five fine ash layers. Stratigraphic positions in the core provide ages of five ashes to be 30, 21, 17, 7.3, and 1.0 cal ka BP, respectively. These layers are correlated with Aira-Tn (AT), Daisen-Kusatanihara (D-KsP), Asama-Kusatsu (As-K), Kikai-Akahoya (K-Ah) and Baitoushan-Tomakomai (B-Tm) tephras in ascending order, based on stratigraphy and petrographic characteristics such as grain assemblages, refractive indices, and major element compositions of glass shards. Although the AT, K-Ah and B-Tm tephras have been well known as widespread tephras, this study finds that the D-KsP, As-K and K-Ah tephras have more extensive distributions than the previous studies estimated. The D-KsP and As-K tephras have the potential to become useful time-markers in and around the Sea of Japan between the AT and K-Ah tephras.
AB - Lake Ichi-no-Megata is a maar in the Oga Peninsula, which is connected with the western side of Honshu Island, NE Japan. A 37-m long sediment core (IMG06) obtained from the center of the lake contains five fine ash layers. Stratigraphic positions in the core provide ages of five ashes to be 30, 21, 17, 7.3, and 1.0 cal ka BP, respectively. These layers are correlated with Aira-Tn (AT), Daisen-Kusatanihara (D-KsP), Asama-Kusatsu (As-K), Kikai-Akahoya (K-Ah) and Baitoushan-Tomakomai (B-Tm) tephras in ascending order, based on stratigraphy and petrographic characteristics such as grain assemblages, refractive indices, and major element compositions of glass shards. Although the AT, K-Ah and B-Tm tephras have been well known as widespread tephras, this study finds that the D-KsP, As-K and K-Ah tephras have more extensive distributions than the previous studies estimated. The D-KsP and As-K tephras have the potential to become useful time-markers in and around the Sea of Japan between the AT and K-Ah tephras.
UR - http://www.scopus.com/inward/record.url?scp=81255188785&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=81255188785&partnerID=8YFLogxK
U2 - 10.1016/j.quaint.2011.08.015
DO - 10.1016/j.quaint.2011.08.015
M3 - Article
VL - 246
SP - 270
EP - 277
JO - Quaternary International
JF - Quaternary International
SN - 1040-6182
IS - 1-2
ER -