Triassic marine Os isotope record from a pelagic chert succession, Sakahogi section, Mino Belt, southwest Japan

Tatsuo Nozaki, Takashi Nikaido, Tetsuji Onoue, Yutaro Takaya, Keiko Sato, Jun Ichi Kimura, Qing Chang, Daisuke Yamashita, Honami Sato, Katsuhiko Suzuki, Yasuhiro Kato, Atsushi Matsuoka

研究成果: ジャーナルへの寄稿記事

抄録

Pelagic cherts preserved in accretionary complexes represent former seafloor sediment that can retain geochemical evidence of paleoceanographic conditions that predate the oldest extant oceanic crust. The ratio of Os isotopes in seawater, in particular, is of wide interest as a source of insight into notable geologic events such as oceanic anoxic events, rapid global warming episodes, and eruption of large igneous provinces, but marine Os isotope records from before 80 Ma are scarce. We present a record of secular variations of marine Os isotope ratios from a thick, continuous succession of Middle and Upper Triassic pelagic chert in the Sakahogi section of the Mino Belt accretionary complex. Initial Os isotope ratios (187Os/188Os) have a wide range in this succession, from 0.197 to 0.813. The variations in this Os record are quite similar to those in the marine Sr isotope record for the same time period, although their amplitudes differ owing to the differing residence times of Os and Sr in the ocean. Together, our results and previous data trace a continuous Os isotope record for ca. 50 Myr starting in Anisian time. We document the following six notable features in the Os record, which also appear in the Sr record, and their interpretation: (1) a negative (unradiogenic) shift associated with euxinia in the latest Anisian reflecting late-stage Siberian Traps eruptions, (2) wide fluctuations from the latest Anisian to Ladinian induced by volcanism and by the late Ladinian humid pulse and volcanism of the Italian Volcanic Center, (3) a continuous decrease in the early Carnian during eruptions of the Wrangellia large igneous province, (4) stable unradiogenic values from the early to early middle Norian associated with a prolonged arid period, (5) a negative spike in the middle Norian associated with the Manicouagan impact event, and (6) a broad rise and fall from the earliest late Norian to the Rhaetian ages, attributed to the Cimmerian-Indosinian orogeny and subsequent volcanism of the Central Atlantic Magmatic Province.

元の言語英語
記事番号100004
ジャーナルJournal of Asian Earth Sciences: X
1
DOI
出版物ステータス出版済み - 6 15 2019

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chert
Triassic
isotope
Anisian
Norian
Ladinian
volcanism
large igneous province
volcanic eruption
Cimmerian
Rhaetian
Carnian
secular variation
orogeny
oceanic crust
residence time
global warming
seafloor
seawater
ocean

All Science Journal Classification (ASJC) codes

  • Geology
  • Earth-Surface Processes

これを引用

Triassic marine Os isotope record from a pelagic chert succession, Sakahogi section, Mino Belt, southwest Japan. / Nozaki, Tatsuo; Nikaido, Takashi; Onoue, Tetsuji; Takaya, Yutaro; Sato, Keiko; Kimura, Jun Ichi; Chang, Qing; Yamashita, Daisuke; Sato, Honami; Suzuki, Katsuhiko; Kato, Yasuhiro; Matsuoka, Atsushi.

:: Journal of Asian Earth Sciences: X, 巻 1, 100004, 15.06.2019.

研究成果: ジャーナルへの寄稿記事

Nozaki, T, Nikaido, T, Onoue, T, Takaya, Y, Sato, K, Kimura, JI, Chang, Q, Yamashita, D, Sato, H, Suzuki, K, Kato, Y & Matsuoka, A 2019, 'Triassic marine Os isotope record from a pelagic chert succession, Sakahogi section, Mino Belt, southwest Japan', Journal of Asian Earth Sciences: X, 巻. 1, 100004. https://doi.org/10.1016/j.jaesx.2018.100004
Nozaki, Tatsuo ; Nikaido, Takashi ; Onoue, Tetsuji ; Takaya, Yutaro ; Sato, Keiko ; Kimura, Jun Ichi ; Chang, Qing ; Yamashita, Daisuke ; Sato, Honami ; Suzuki, Katsuhiko ; Kato, Yasuhiro ; Matsuoka, Atsushi. / Triassic marine Os isotope record from a pelagic chert succession, Sakahogi section, Mino Belt, southwest Japan. :: Journal of Asian Earth Sciences: X. 2019 ; 巻 1.
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abstract = "Pelagic cherts preserved in accretionary complexes represent former seafloor sediment that can retain geochemical evidence of paleoceanographic conditions that predate the oldest extant oceanic crust. The ratio of Os isotopes in seawater, in particular, is of wide interest as a source of insight into notable geologic events such as oceanic anoxic events, rapid global warming episodes, and eruption of large igneous provinces, but marine Os isotope records from before 80 Ma are scarce. We present a record of secular variations of marine Os isotope ratios from a thick, continuous succession of Middle and Upper Triassic pelagic chert in the Sakahogi section of the Mino Belt accretionary complex. Initial Os isotope ratios (187Os/188Os) have a wide range in this succession, from 0.197 to 0.813. The variations in this Os record are quite similar to those in the marine Sr isotope record for the same time period, although their amplitudes differ owing to the differing residence times of Os and Sr in the ocean. Together, our results and previous data trace a continuous Os isotope record for ca. 50 Myr starting in Anisian time. We document the following six notable features in the Os record, which also appear in the Sr record, and their interpretation: (1) a negative (unradiogenic) shift associated with euxinia in the latest Anisian reflecting late-stage Siberian Traps eruptions, (2) wide fluctuations from the latest Anisian to Ladinian induced by volcanism and by the late Ladinian humid pulse and volcanism of the Italian Volcanic Center, (3) a continuous decrease in the early Carnian during eruptions of the Wrangellia large igneous province, (4) stable unradiogenic values from the early to early middle Norian associated with a prolonged arid period, (5) a negative spike in the middle Norian associated with the Manicouagan impact event, and (6) a broad rise and fall from the earliest late Norian to the Rhaetian ages, attributed to the Cimmerian-Indosinian orogeny and subsequent volcanism of the Central Atlantic Magmatic Province.",
author = "Tatsuo Nozaki and Takashi Nikaido and Tetsuji Onoue and Yutaro Takaya and Keiko Sato and Kimura, {Jun Ichi} and Qing Chang and Daisuke Yamashita and Honami Sato and Katsuhiko Suzuki and Yasuhiro Kato and Atsushi Matsuoka",
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T1 - Triassic marine Os isotope record from a pelagic chert succession, Sakahogi section, Mino Belt, southwest Japan

AU - Nozaki, Tatsuo

AU - Nikaido, Takashi

AU - Onoue, Tetsuji

AU - Takaya, Yutaro

AU - Sato, Keiko

AU - Kimura, Jun Ichi

AU - Chang, Qing

AU - Yamashita, Daisuke

AU - Sato, Honami

AU - Suzuki, Katsuhiko

AU - Kato, Yasuhiro

AU - Matsuoka, Atsushi

PY - 2019/6/15

Y1 - 2019/6/15

N2 - Pelagic cherts preserved in accretionary complexes represent former seafloor sediment that can retain geochemical evidence of paleoceanographic conditions that predate the oldest extant oceanic crust. The ratio of Os isotopes in seawater, in particular, is of wide interest as a source of insight into notable geologic events such as oceanic anoxic events, rapid global warming episodes, and eruption of large igneous provinces, but marine Os isotope records from before 80 Ma are scarce. We present a record of secular variations of marine Os isotope ratios from a thick, continuous succession of Middle and Upper Triassic pelagic chert in the Sakahogi section of the Mino Belt accretionary complex. Initial Os isotope ratios (187Os/188Os) have a wide range in this succession, from 0.197 to 0.813. The variations in this Os record are quite similar to those in the marine Sr isotope record for the same time period, although their amplitudes differ owing to the differing residence times of Os and Sr in the ocean. Together, our results and previous data trace a continuous Os isotope record for ca. 50 Myr starting in Anisian time. We document the following six notable features in the Os record, which also appear in the Sr record, and their interpretation: (1) a negative (unradiogenic) shift associated with euxinia in the latest Anisian reflecting late-stage Siberian Traps eruptions, (2) wide fluctuations from the latest Anisian to Ladinian induced by volcanism and by the late Ladinian humid pulse and volcanism of the Italian Volcanic Center, (3) a continuous decrease in the early Carnian during eruptions of the Wrangellia large igneous province, (4) stable unradiogenic values from the early to early middle Norian associated with a prolonged arid period, (5) a negative spike in the middle Norian associated with the Manicouagan impact event, and (6) a broad rise and fall from the earliest late Norian to the Rhaetian ages, attributed to the Cimmerian-Indosinian orogeny and subsequent volcanism of the Central Atlantic Magmatic Province.

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