Paleoclimatic and paleoceanographic records through Marine Isotope Stage 19 at the Chiba composite section, central Japan: A key reference for the Early–Middle Pleistocene Subseries boundary

Suganuma, Yûsuke; Haneda, Yuki; Kameo, Koji; Kubota, Yoshimi; Hayashi, Hiroki; Itaki, Takuya; Okuda, Masahiro; Martin, Jessica; Sugaya, Manami; Nakazato, Hiroomi; Igarashi, Atsuo; Shikoku, Kizuku; Hongo, Misao; Watanabe, Masami; Satoguchi, Yasufumi; Takeshita, Yoshihiro; Nishida, Naoshi; Izumi, Kiyotaka; Kawamura, Kenji; Kawamata, Moto; Okuno, Jun’ichi; Yoshida, Takeyoshi; Ogitsu, Itaru; Yabusaki, Hisashi; Okada, Makoto

doi:10.1016/j.quascirev.2018.04.022

Cited by 45 publications

(203 citation statements)

References 109 publications

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“…Chiba composite section; CbCS L-M Kazaoka et al, 2015;Nishida et al, 2016;Okada et al, 2017;Suganuma et al, 2018 The Chiba Section, Japan: a proposed Global Boundary Stratotype Section and Point GSSP for the base of the Middle Pleistocene Subseries Kazaoka et al 2015Suganuma et al 2015Nishida et al 2016Okada et al 2017Suganuma et al 2018 -…”

Section: L-m Gsspmentioning

confidence: 99%

“…(k) Molluscan fossil assemblages (Baba, 1990 Fig. 5 CbCS GSSP L-M CbCS Nishida et al, 2016Nishida et al, 20162 Kazaoka et al, 2015, 1973, 1990, 1986, 1969Suganuma et al, 2018Oda, 1977, 1979;, 1994;Igarashi, 1996;, 1961;Aoki, 1968;, 1988Suganuma et al, 2018Cherepanova et al, 2002Suganuma et al, 2018Suganuma et al 2018 2.4. 6 Oda, 1977;, 1979;, 1994;Igarashi, 1996;, 1961; , 1986; , 1973; , 1990 Fig.…”

Section: L-m Gsspmentioning

confidence: 99%

“…The stratigraphic correlations are based on lithological changes and marker tephra beds. Sampling horizons for paleomagnetic (thin horizontal bars), δ 18 O (light blue lines) measurements (Suganuma et al, 2015;Okada et al, 2017;Suganuma et al, 2018), pollen (orange squares), and marine microfossils (calcareous nannofossils: red triangles and radiolarians: purple triangles) are shown in the figure. Modified from Suganuma et al (2018).…”

Section: 1 Byk-ementioning

confidence: 99%

“…Sampling horizons for paleomagnetic (thin horizontal bars), δ 18 O (light blue lines) measurements (Suganuma et al, 2015;Okada et al, 2017;Suganuma et al, 2018), pollen (orange squares), and marine microfossils (calcareous nannofossils: red triangles and radiolarians: purple triangles) are shown in the figure. Modified from Suganuma et al (2018). Augustin et al, 2004;Jouzel et al, 2007;Bereiter et al, 2015 Channell andKleiven, 2000;Hodell et al, 2008;Valet et al, 2014LR04 Lisiecki and Raymo, 2005Elderfield et al, 2012 bipolar seesaw model Barker et al, 2011 et al, 2004).…”

Section: 1 Byk-ementioning

confidence: 99%

“…(h) A synthetic record of Greenland climate variability (δ 18 O) based on the thermal bipolar seesaw model (purple) (Barker et al, 2011). (i) δ 18 O stratigraphy of benthic and planktonic foraminifera with the broadleaved pollen percentage (yellow shade) from the Chiba composite section (Suganuma et al, 2018). Red/blue lines are from the Yanagawa, Urajiro, and Kokusabata sections (1.0 m spacing), and orange and light blue lines are from the Yoro River and Yoro-Tabuchi sections (0.2 and 1.0 m spacing).…”

Section: 1 Byk-ementioning

confidence: 99%

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A summary of the Chiba Section, Japan

千葉セクションGSSP提案チーム¹

2019

Jour. Geol. Soc. Japan

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We propose the extensively studied Chiba section of the Chiba composite section (CbCS) as the Global Boundary Stratotype Section and Point (GSSP) to define the base of the Middle Pleistocene Subseries and Chibanian Stage. The CbCS is a continuous and expanded marine sedimentary succession within the middle of the Kokumoto Formation, Boso Peninsula, Chiba Prefecture. It contains well-preserved pollen, marine micro-and macrofossils, a tightly-defined Matuyama-Brunhes (M-B) paleomagnetic polarity boundary, and numerous tephra beds, allowing the establishment of a robust and precise chronostratigraphic framework across the Lower-Middle Pleistocene boundary. Its deep-marine, open-ocean continental slope setting, coupled with high sedimentation rates with no evidence of abrupt deposition, has resulted in preserving both terrestrial and marine environmental changes in and around Marine Isotope Stage (MIS). We have performed high-resolution oxygen isotope analysis, as well as detailed sedimentological, geochemical, and biostratigraphic studies of the CbCS, confirming the completeness of the stratigraphic interval spanning the Lower-Middle Pleistocene boundary. The M-B polarity boundary serves as the agreed primary guide for the Lower-Middle Pleistocene boundary, and the CbCS represents one of the most detailed marine sedimentary records yet obtained for this reversal, yielding an astronomical age of. ka with a duration of ca.. kyr. This section therefore offers an exceptional opportunity to calibrate the geological time scale as well as understand the dynamics of the geodynamo. The widespread Byk-E tephra lies close to the reversal, allowing precise regional lithostratigraphic correlation. The CbCS is easy to access from international airports. The section will be permanently preserved and maintained by the local government as a natural monument. Based on these attributes, the base of the Byk-E tephra bed in the Chiba section is the best horizon for establishing the GSSP that will define the Lower-Middle Pleistocene boundary.

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