Oceanic oxygenation events in the anoxic Ediacaran ocean

S. K. Sahoo, N. J. Planavsky, G. Jiang, B. Kendall, J. D. Owens, X. Wang, X. Shi, Ariel Anbar, T. W. Lyons

Research output: Contribution to journalArticle

92 Citations (Scopus)

Abstract

The ocean-atmosphere system is typically envisioned to have gone through a unidirectional oxygenation with significant oxygen increases in the earliest (ca. 635 Ma), middle (ca. 580 Ma), or late (ca. 560 Ma) Ediacaran Period. However, temporally discontinuous geochemical data and the patchy metazoan fossil record have been inadequate to chart the details of Ediacaran ocean oxygenation, raising fundamental debates about the timing of ocean oxygenation, its purported unidirectional rise, and its causal relationship, if any, with the evolution of early animal life. To better understand the Ediacaran ocean redox evolution, we have conducted a multi-proxy paleoredox study of a relatively continuous, deep-water section in South China that was paleogeographically connected with the open ocean. Iron speciation and pyrite morphology indicate locally euxinic (anoxic and sulfidic) environments throughout the Ediacaran in this section. In the same rocks, redox sensitive element enrichments and sulfur isotope data provide evidence for multiple oceanic oxygenation events (OOEs) in a predominantly anoxic global Ediacaran-early Cambrian ocean. This dynamic redox landscape contrasts with a recent view of a redox-static Ediacaran ocean without significant change in oxygen content. The duration of the Ediacaran OOEs may be comparable to those of the oceanic anoxic events (OAEs) in otherwise well-oxygenated Phanerozoic oceans. Anoxic events caused mass extinctions followed by fast recovery in biologically diversified Phanerozoic oceans. In contrast, oxygenation events in otherwise ecologically monotonous anoxic Ediacaran-early Cambrian oceans may have stimulated biotic innovations followed by prolonged evolutionary stasis.

Original languageEnglish (US)
Pages (from-to)457-468
Number of pages12
JournalGeobiology
Volume14
Issue number5
DOIs
StatePublished - Sep 1 2016

Fingerprint

Ediacaran
oxygenation
oceans
ocean
Phanerozoic
atmosphere-ocean system
metazoan
sulfur isotope
mass extinction
oxygen
open ocean
fossil record
pyrite
innovation
deep water
isotopes
sulfur
iron
extinction
fossils

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Cite this

Sahoo, S. K., Planavsky, N. J., Jiang, G., Kendall, B., Owens, J. D., Wang, X., ... Lyons, T. W. (2016). Oceanic oxygenation events in the anoxic Ediacaran ocean. Geobiology, 14(5), 457-468. https://doi.org/10.1111/gbi.12182

Oceanic oxygenation events in the anoxic Ediacaran ocean. / Sahoo, S. K.; Planavsky, N. J.; Jiang, G.; Kendall, B.; Owens, J. D.; Wang, X.; Shi, X.; Anbar, Ariel; Lyons, T. W.

In: Geobiology, Vol. 14, No. 5, 01.09.2016, p. 457-468.

Research output: Contribution to journalArticle

Sahoo, SK, Planavsky, NJ, Jiang, G, Kendall, B, Owens, JD, Wang, X, Shi, X, Anbar, A & Lyons, TW 2016, 'Oceanic oxygenation events in the anoxic Ediacaran ocean', Geobiology, vol. 14, no. 5, pp. 457-468. https://doi.org/10.1111/gbi.12182
Sahoo SK, Planavsky NJ, Jiang G, Kendall B, Owens JD, Wang X et al. Oceanic oxygenation events in the anoxic Ediacaran ocean. Geobiology. 2016 Sep 1;14(5):457-468. https://doi.org/10.1111/gbi.12182
Sahoo, S. K. ; Planavsky, N. J. ; Jiang, G. ; Kendall, B. ; Owens, J. D. ; Wang, X. ; Shi, X. ; Anbar, Ariel ; Lyons, T. W. / Oceanic oxygenation events in the anoxic Ediacaran ocean. In: Geobiology. 2016 ; Vol. 14, No. 5. pp. 457-468.
@article{5801b3d5593f45d9930f98c50dcbc183,
title = "Oceanic oxygenation events in the anoxic Ediacaran ocean",
abstract = "The ocean-atmosphere system is typically envisioned to have gone through a unidirectional oxygenation with significant oxygen increases in the earliest (ca. 635 Ma), middle (ca. 580 Ma), or late (ca. 560 Ma) Ediacaran Period. However, temporally discontinuous geochemical data and the patchy metazoan fossil record have been inadequate to chart the details of Ediacaran ocean oxygenation, raising fundamental debates about the timing of ocean oxygenation, its purported unidirectional rise, and its causal relationship, if any, with the evolution of early animal life. To better understand the Ediacaran ocean redox evolution, we have conducted a multi-proxy paleoredox study of a relatively continuous, deep-water section in South China that was paleogeographically connected with the open ocean. Iron speciation and pyrite morphology indicate locally euxinic (anoxic and sulfidic) environments throughout the Ediacaran in this section. In the same rocks, redox sensitive element enrichments and sulfur isotope data provide evidence for multiple oceanic oxygenation events (OOEs) in a predominantly anoxic global Ediacaran-early Cambrian ocean. This dynamic redox landscape contrasts with a recent view of a redox-static Ediacaran ocean without significant change in oxygen content. The duration of the Ediacaran OOEs may be comparable to those of the oceanic anoxic events (OAEs) in otherwise well-oxygenated Phanerozoic oceans. Anoxic events caused mass extinctions followed by fast recovery in biologically diversified Phanerozoic oceans. In contrast, oxygenation events in otherwise ecologically monotonous anoxic Ediacaran-early Cambrian oceans may have stimulated biotic innovations followed by prolonged evolutionary stasis.",
author = "Sahoo, {S. K.} and Planavsky, {N. J.} and G. Jiang and B. Kendall and Owens, {J. D.} and X. Wang and X. Shi and Ariel Anbar and Lyons, {T. W.}",
year = "2016",
month = "9",
day = "1",
doi = "10.1111/gbi.12182",
language = "English (US)",
volume = "14",
pages = "457--468",
journal = "Geobiology",
issn = "1472-4677",
publisher = "Wiley-Blackwell",
number = "5",

}

TY - JOUR

T1 - Oceanic oxygenation events in the anoxic Ediacaran ocean

AU - Sahoo, S. K.

AU - Planavsky, N. J.

AU - Jiang, G.

AU - Kendall, B.

AU - Owens, J. D.

AU - Wang, X.

AU - Shi, X.

AU - Anbar, Ariel

AU - Lyons, T. W.

PY - 2016/9/1

Y1 - 2016/9/1

N2 - The ocean-atmosphere system is typically envisioned to have gone through a unidirectional oxygenation with significant oxygen increases in the earliest (ca. 635 Ma), middle (ca. 580 Ma), or late (ca. 560 Ma) Ediacaran Period. However, temporally discontinuous geochemical data and the patchy metazoan fossil record have been inadequate to chart the details of Ediacaran ocean oxygenation, raising fundamental debates about the timing of ocean oxygenation, its purported unidirectional rise, and its causal relationship, if any, with the evolution of early animal life. To better understand the Ediacaran ocean redox evolution, we have conducted a multi-proxy paleoredox study of a relatively continuous, deep-water section in South China that was paleogeographically connected with the open ocean. Iron speciation and pyrite morphology indicate locally euxinic (anoxic and sulfidic) environments throughout the Ediacaran in this section. In the same rocks, redox sensitive element enrichments and sulfur isotope data provide evidence for multiple oceanic oxygenation events (OOEs) in a predominantly anoxic global Ediacaran-early Cambrian ocean. This dynamic redox landscape contrasts with a recent view of a redox-static Ediacaran ocean without significant change in oxygen content. The duration of the Ediacaran OOEs may be comparable to those of the oceanic anoxic events (OAEs) in otherwise well-oxygenated Phanerozoic oceans. Anoxic events caused mass extinctions followed by fast recovery in biologically diversified Phanerozoic oceans. In contrast, oxygenation events in otherwise ecologically monotonous anoxic Ediacaran-early Cambrian oceans may have stimulated biotic innovations followed by prolonged evolutionary stasis.

AB - The ocean-atmosphere system is typically envisioned to have gone through a unidirectional oxygenation with significant oxygen increases in the earliest (ca. 635 Ma), middle (ca. 580 Ma), or late (ca. 560 Ma) Ediacaran Period. However, temporally discontinuous geochemical data and the patchy metazoan fossil record have been inadequate to chart the details of Ediacaran ocean oxygenation, raising fundamental debates about the timing of ocean oxygenation, its purported unidirectional rise, and its causal relationship, if any, with the evolution of early animal life. To better understand the Ediacaran ocean redox evolution, we have conducted a multi-proxy paleoredox study of a relatively continuous, deep-water section in South China that was paleogeographically connected with the open ocean. Iron speciation and pyrite morphology indicate locally euxinic (anoxic and sulfidic) environments throughout the Ediacaran in this section. In the same rocks, redox sensitive element enrichments and sulfur isotope data provide evidence for multiple oceanic oxygenation events (OOEs) in a predominantly anoxic global Ediacaran-early Cambrian ocean. This dynamic redox landscape contrasts with a recent view of a redox-static Ediacaran ocean without significant change in oxygen content. The duration of the Ediacaran OOEs may be comparable to those of the oceanic anoxic events (OAEs) in otherwise well-oxygenated Phanerozoic oceans. Anoxic events caused mass extinctions followed by fast recovery in biologically diversified Phanerozoic oceans. In contrast, oxygenation events in otherwise ecologically monotonous anoxic Ediacaran-early Cambrian oceans may have stimulated biotic innovations followed by prolonged evolutionary stasis.

UR - http://www.scopus.com/inward/record.url?scp=85027944588&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85027944588&partnerID=8YFLogxK

U2 - 10.1111/gbi.12182

DO - 10.1111/gbi.12182

M3 - Article

C2 - 27027776

AN - SCOPUS:85027944588

VL - 14

SP - 457

EP - 468

JO - Geobiology

JF - Geobiology

SN - 1472-4677

IS - 5

ER -