Numazawa-Kanayama Tephra Erupted from Numazawa Volcano at 50-55ka in the Southern Part of the Northeast Japan Arc.

Suzuki, Takehiko; Soda, Tsutomu

doi:10.4116/jaqua.33.233

Cited by 6 publications

(7 citation statements)

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“…2) as central and southern NE Japan, respectively. Some volcanoes (calderas) that erupted during the late Pleistocene provided cummingtonite-bearing tephras to the forearc: namely, the Dokusawa tephra (Dks), from the Hijiori volcano or another volcano in its vicinity, MIS 5.2-5.3 (Matsu'ura et al, 2002); the Naruko-Nisaka tephra (N-N), from the Naruko caldera, MIS 5.2-5.3 (Soda, 1989;Matsu'ura et al, 2009); the Adachi-Medeshima tephra (Ac-Md), from the Adachi volcano, older than MIS 5.2 (Yagi and Soda, 1989); the Numazawa-Shibahara tephra (Nm-SB) from the Numazawa caldera, 110 ka or MIS 5.4-5.3 (Suzuki et al, 2004); and the Numazawa-Kanayama tephra (Nm-KN) from the Numazawa caldera, 50-55 ka (Suzuki and Soda, 1994). No cummingtonite-bearing tephras were observed stratigraphically above the Aso-4 tephra (MIS 5.2) in marine cores KH-94-3 and LM-8, obtained offshore of Kesennuma (Aoki and Arai, 2000;Aoki, 2008; Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Its 5-cm isopach is far from loc. 1 (Kesennuma) (Suzuki and Soda, 1994; Fig. 2), but its 0-cm isopach has not been identified.…”

Section: Numazawa-kanayama Tephra (Nm-kn)mentioning

confidence: 98%

“…2; Suzuki et al, 2004). Nm-KN is between Aso-4 and the Daisen-Kurayoshi tephra (DKP) within the loess deposits (Suzuki and Soda, 1994). Its eruptive age was previously estimated to be 50-55 ka by assuming a constant accumulation rate of the loess between Aso-4 (MIS5.2, 86.8-87.3 ka; Aoki, 2008) and DKP (50-52 ka) (Suzuki and Soda, 1994).…”

Section: Numazawa-kanayama Tephra (Nm-kn)mentioning

confidence: 99%

“…Nm-KN is between Aso-4 and the Daisen-Kurayoshi tephra (DKP) within the loess deposits (Suzuki and Soda, 1994). Its eruptive age was previously estimated to be 50-55 ka by assuming a constant accumulation rate of the loess between Aso-4 (MIS5.2, 86.8-87.3 ka; Aoki, 2008) and DKP (50-52 ka) (Suzuki and Soda, 1994). However, the estimated eruptive age of DKP has recently been revised to ≥55 ka (Machida and Arai, 2003), older than the previous estimation, so the eruptive age of Nm-KN can now be estimated as ca.…”

Section: Numazawa-kanayama Tephra (Nm-kn)mentioning

confidence: 99%

“…2), but its 0-cm isopach has not been identified. Its heavy mineral assemblage consists of hornblende, cummingtonite, and biotite (Suzuki and Soda, 1994). We determined the Fe and Mg contents of the cummingtonite (sample 10 K1) as 1.89-2.01 and 4.31-4.59, respectively (Fig.…”

Section: Numazawa-kanayama Tephra (Nm-kn)mentioning

confidence: 99%

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Late Quaternary cryptotephra detection and correlation in loess in northeastern Japan using cummingtonite geochemistry

2011

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We detected late Pleistocene cummingtonite-bearing cryptotephras in loess deposits in NE Japan and correlated them with known tephras elsewhere by using major-element compositions of the cummingtonite. This is the first time cryptotephras have been identified by analysis of a crystal phase rather than glass shards. In central NE Japan, four cummingtonite-bearing tephras, the Ichihasama pumice, the Dokusawa tephra, the Naruko–Nisaka tephra, and the Adachi–Medeshima tephra, are present in late Pleistocene loess deposits. Because the cummingtonite chemistry of each tephra is different and characteristic, it is potentially a powerful tool for detecting and identifying cryptotephras. An unidentified cummingtonite-bearing cryptotephra previously reported to be present in the late Pleistocene loess deposits at Kesennuma (Pacific coast) did not correlate with any of the known cummingtonite-bearing tephras in central NE Japan, but instead with the Numazawa–Kanayama tephra (erupted from the Numazawa caldera, southern NE Japan), although Kesennuma is well beyond the previously reported area of the distribution of the Numazawa–Kanayama tephra. Three new cummingtonite-bearing cryptotephras in the mid and late Pleistocene loess deposits (estimated to be less than 82 ka, 100–200 ka, and ca. 250 ka) on the Isawa upland were also detected.

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