Carbon isotope stratigraphy of Torinosu-type limestone in the western Paleo-Pacific and its implication to paleoceanography in the Late Jurassic and earliest Cretaceous

Yoshihiro Kakizaki, Akihiro Kano

研究成果: ジャーナルへの寄稿記事

2 引用 (Scopus)

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Carbon isotope stratigraphy of the Late Jurassic and earliest Cretaceous was revealed from Torinosu-type limestone, which was deposited in a shallow-marine setting in the western Paleo-Pacific, in Japan. Two sections were examined; the Nakanosawa section of the late Kimmeridgian to early Tithonian age (Fukushima Prefecture, Northeast Japan), and the Furuichi section of the late Kimmeridgian to early Berriasian age (Ehime Prefecture, Southwest Japan). The age-model was established using Sr isotope ratio and fossil occurrence. The limestone samples have a low Mn/Sr ratio (mostly <0.5) and lack a distinct correlation between δ13C and δ18O, indicating a low degree of diagenetic alteration. Our composite δ13C profile from the two limestone sections shows three stratigraphic correlation points that can be correlated with the profiles of relevant ages from the Alpine Tethyan region: a large-amplitude fluctuation (the lower upper Kimmeridgian, ∼152Ma), a positive anomaly (above the Kimmeridgian/Tithonian boundary, ∼150Ma), and a negative anomaly (the upper lower Tithonian, ∼148Ma). In addition, we found that δ13C values of the Torinosu-type limestone are ∼1‰ lower than the Tethyan values in the late Kimmeridgian. This inter-regional difference in δ13C values is likely to have resulted from a higher productivity and/or an organic burial in the Tethyan region. The difference gradually reduces and disappears in the late Tithonian, where the Tethyan and our δ13C records show similar stable values of 1.5-2.0‰. This isotopic homogenization is probably due to changes in the continental distribution and the global ocean circulation, which propagated the 13C-depleted signature from the larger Paleo-Pacific to the smaller Tethys Ocean during this time.

元の言語英語
ページ(範囲)16-32
ページ数17
ジャーナルIsland Arc
23
発行部数1
DOI
出版物ステータス出版済み - 1 1 2014

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paleoceanography
Kimmeridgian
Tithonian
carbon isotope
stratigraphy
Jurassic
limestone
Cretaceous
anomaly
Berriasian
stratigraphic correlation
global ocean
Tethys
isotope
fossil
productivity
ocean

All Science Journal Classification (ASJC) codes

  • Geology

これを引用

Carbon isotope stratigraphy of Torinosu-type limestone in the western Paleo-Pacific and its implication to paleoceanography in the Late Jurassic and earliest Cretaceous. / Kakizaki, Yoshihiro; Kano, Akihiro.

:: Island Arc, 巻 23, 番号 1, 01.01.2014, p. 16-32.

研究成果: ジャーナルへの寄稿記事

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title = "Carbon isotope stratigraphy of Torinosu-type limestone in the western Paleo-Pacific and its implication to paleoceanography in the Late Jurassic and earliest Cretaceous",
abstract = "Carbon isotope stratigraphy of the Late Jurassic and earliest Cretaceous was revealed from Torinosu-type limestone, which was deposited in a shallow-marine setting in the western Paleo-Pacific, in Japan. Two sections were examined; the Nakanosawa section of the late Kimmeridgian to early Tithonian age (Fukushima Prefecture, Northeast Japan), and the Furuichi section of the late Kimmeridgian to early Berriasian age (Ehime Prefecture, Southwest Japan). The age-model was established using Sr isotope ratio and fossil occurrence. The limestone samples have a low Mn/Sr ratio (mostly <0.5) and lack a distinct correlation between δ13C and δ18O, indicating a low degree of diagenetic alteration. Our composite δ13C profile from the two limestone sections shows three stratigraphic correlation points that can be correlated with the profiles of relevant ages from the Alpine Tethyan region: a large-amplitude fluctuation (the lower upper Kimmeridgian, ∼152Ma), a positive anomaly (above the Kimmeridgian/Tithonian boundary, ∼150Ma), and a negative anomaly (the upper lower Tithonian, ∼148Ma). In addition, we found that δ13C values of the Torinosu-type limestone are ∼1‰ lower than the Tethyan values in the late Kimmeridgian. This inter-regional difference in δ13C values is likely to have resulted from a higher productivity and/or an organic burial in the Tethyan region. The difference gradually reduces and disappears in the late Tithonian, where the Tethyan and our δ13C records show similar stable values of 1.5-2.0‰. This isotopic homogenization is probably due to changes in the continental distribution and the global ocean circulation, which propagated the 13C-depleted signature from the larger Paleo-Pacific to the smaller Tethys Ocean during this time.",
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AB - Carbon isotope stratigraphy of the Late Jurassic and earliest Cretaceous was revealed from Torinosu-type limestone, which was deposited in a shallow-marine setting in the western Paleo-Pacific, in Japan. Two sections were examined; the Nakanosawa section of the late Kimmeridgian to early Tithonian age (Fukushima Prefecture, Northeast Japan), and the Furuichi section of the late Kimmeridgian to early Berriasian age (Ehime Prefecture, Southwest Japan). The age-model was established using Sr isotope ratio and fossil occurrence. The limestone samples have a low Mn/Sr ratio (mostly <0.5) and lack a distinct correlation between δ13C and δ18O, indicating a low degree of diagenetic alteration. Our composite δ13C profile from the two limestone sections shows three stratigraphic correlation points that can be correlated with the profiles of relevant ages from the Alpine Tethyan region: a large-amplitude fluctuation (the lower upper Kimmeridgian, ∼152Ma), a positive anomaly (above the Kimmeridgian/Tithonian boundary, ∼150Ma), and a negative anomaly (the upper lower Tithonian, ∼148Ma). In addition, we found that δ13C values of the Torinosu-type limestone are ∼1‰ lower than the Tethyan values in the late Kimmeridgian. This inter-regional difference in δ13C values is likely to have resulted from a higher productivity and/or an organic burial in the Tethyan region. The difference gradually reduces and disappears in the late Tithonian, where the Tethyan and our δ13C records show similar stable values of 1.5-2.0‰. This isotopic homogenization is probably due to changes in the continental distribution and the global ocean circulation, which propagated the 13C-depleted signature from the larger Paleo-Pacific to the smaller Tethys Ocean during this time.

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