Yang, Shengchao;
Fan, Junxuan;
Algeo, Thomas J;
Shields, Graham A;
Zhou, Ying;
Li, Chao;
Chen, Jitao;
... Shen, Shuzhong; + view all
(2024)
Steep oceanic DIC δ13C depth gradient during the Hirnantian Glaciation.
Earth-Science Reviews
, 255
, Article 104840. 10.1016/j.earscirev.2024.104840.
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Abstract
The Hirnantian carbon isotopic excursion (HICE) was characterized by a positive δ13C excursion (up to ∼ + 7‰) of oceanic dissolved inorganic carbon (DIC). However its mechanism remains controversial, impeding our understanding of this global event and its environmental significance. Here, we conducted a comprehensive analysis of global carbon-isotope records, based on 65 paleogeographically-widely distributed sections (4612 carbon-isotope data), documenting a steep oceanic DIC δ13C water-depth gradient (e.g., a 4.6‰ offset in the HICE excursion magnitude within Laurentia) during the Hirnantian Stage. We propose a hybrid hypothesis that the HICE records a shift toward more positive values owing to a large glacio-eustatic fall (>100 m) under the herein-identified steep δ13C water-depth gradient, with potential contributions from global-ocean δ13CDIC changes and authigenic carbonates. This study provides the first large-data evidence for a widely density-stratified ocean during the Hirnantian Glaciation, with implications for reconstructions of ocean circulation and the carbon cycle during the Early Paleozoic.
| Type: | Article |
|---|---|
| Title: | Steep oceanic DIC δ13C depth gradient during the Hirnantian Glaciation |
| DOI: | 10.1016/j.earscirev.2024.104840 |
| Publisher version: | https://doi.org/10.1016/j.earscirev.2024.104840 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Ordovician; HICE; carbon cycle; ice age; dissolved inorganic carbon |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10193643 |
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