Age of Matuyama-Brunhes boundary constrained by U-Pb zircon dating of a widespread tephra

Yusuke Suganuma, Makoto Okada, Kenji Horie, Hiroshi Kaiden, Mami Takehara, Ryoko Senda, Jun Ichi Kimura, Kenji Kawamura, Yuki Haneda, Osamu Kazaoka, Martin J. Head

研究成果: ジャーナルへの寄稿記事

40 引用 (Scopus)

抄録

The youngest geomagnetic polarity reversal, the Matuyama-Brunhes boundary (MBB), provides an important datum plane for sediments, ice cores, and lavas. Its frequently cited age of 780 ka is based on orbital tuning of marine sedimentary records, and is supported by 40Ar/39Ar dating of Hawaiian lavas using recent age calibrations. Challenging this age, however, are reports of younger astrochronological ages based on oxygen isotope stratigraphy of high-sedimentation-rate marine records, and cosmogenic nuclides in marine sediments and an Antarctic ice core. Here, we present a U-Pb zircon age of 772.7 ± 7.2 ka from a marinedeposited tephra just below the MBB in a forearc basin in Japan. U-Pb dating has a distinct advantage over 40Ar/39Ar dating in that it is relatively free from assumptions regarding standardization and decay constants. This U-Pb zircon age, coupled with a newly obtained oxygen isotope chronology, yields an MBB age of 770.2 ± 7.3 ka. Our MBB age is consistent with those based on the latest orbitally tuned marine sediment records and on an Antarctic ice core. We provide the first direct comparison between orbital tuning, U-Pb dating, and magnetostratigraphy for the MBB, fulfilling a key requirement in calibrating the geological time scale.

元の言語英語
ページ(範囲)491-494
ページ数4
ジャーナルGeology
43
発行部数6
DOI
出版物ステータス出版済み - 4 24 2015

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Brunhes chron
tephra
zircon
ice core
marine sediment
oxygen isotope
marine record
magnetic reversal
magnetostratigraphy
dating
geological time
forearc basin
standardization
sedimentation rate
chronology
stratigraphy
calibration
timescale

All Science Journal Classification (ASJC) codes

  • Geology

これを引用

Suganuma, Y., Okada, M., Horie, K., Kaiden, H., Takehara, M., Senda, R., ... Head, M. J. (2015). Age of Matuyama-Brunhes boundary constrained by U-Pb zircon dating of a widespread tephra. Geology, 43(6), 491-494. https://doi.org/10.1130/G36625.1

Age of Matuyama-Brunhes boundary constrained by U-Pb zircon dating of a widespread tephra. / Suganuma, Yusuke; Okada, Makoto; Horie, Kenji; Kaiden, Hiroshi; Takehara, Mami; Senda, Ryoko; Kimura, Jun Ichi; Kawamura, Kenji; Haneda, Yuki; Kazaoka, Osamu; Head, Martin J.

:: Geology, 巻 43, 番号 6, 24.04.2015, p. 491-494.

研究成果: ジャーナルへの寄稿記事

Suganuma, Y, Okada, M, Horie, K, Kaiden, H, Takehara, M, Senda, R, Kimura, JI, Kawamura, K, Haneda, Y, Kazaoka, O & Head, MJ 2015, 'Age of Matuyama-Brunhes boundary constrained by U-Pb zircon dating of a widespread tephra', Geology, 巻. 43, 番号 6, pp. 491-494. https://doi.org/10.1130/G36625.1
Suganuma, Yusuke ; Okada, Makoto ; Horie, Kenji ; Kaiden, Hiroshi ; Takehara, Mami ; Senda, Ryoko ; Kimura, Jun Ichi ; Kawamura, Kenji ; Haneda, Yuki ; Kazaoka, Osamu ; Head, Martin J. / Age of Matuyama-Brunhes boundary constrained by U-Pb zircon dating of a widespread tephra. :: Geology. 2015 ; 巻 43, 番号 6. pp. 491-494.
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