Advanced

Multiple episodes of extensive marine anoxia linked to global warming and continental weathering following the latest Permian mass extinction

Zhang, Feifei; Romaniello, Stephen J.; Algeo, Thomas J.; Lau, Kimberly V.; Clapham, Matthew E.; Richoz, Sylvain LU ; Herrmann, Achim D.; Smith, Harrison; Horacek, Micha and Anbar, Ariel D. (2018) In Science Advances 4(4).
Abstract

Explaining the ∼5-million-year delay in marine biotic recovery following the latest Permian mass extinction, the largest biotic crisis of the Phanerozoic, is a fundamental challenge for both geological and biological sciences. Ocean redox perturbations may have played a critical role in this delayed recovery. However, the lack of quantitative constraints on the details of Early Triassic oceanic anoxia (for example, time, duration, and extent) leaves the links between oceanic conditions and the delayed biotic recovery ambiguous. We report high-resolution U-isotope (δ238U) data from carbonates of the uppermost Permian to lowermost Middle Triassic Zal section (Iran) to characterize the timing and global extent of ocean redox... (More)

Explaining the ∼5-million-year delay in marine biotic recovery following the latest Permian mass extinction, the largest biotic crisis of the Phanerozoic, is a fundamental challenge for both geological and biological sciences. Ocean redox perturbations may have played a critical role in this delayed recovery. However, the lack of quantitative constraints on the details of Early Triassic oceanic anoxia (for example, time, duration, and extent) leaves the links between oceanic conditions and the delayed biotic recovery ambiguous. We report high-resolution U-isotope (δ238U) data from carbonates of the uppermost Permian to lowermost Middle Triassic Zal section (Iran) to characterize the timing and global extent of ocean redox variation during the Early Triassic. Our δ238U record reveals multiple negative shifts during the Early Triassic. Isotope mass-balance modeling suggests that the global area of anoxic seafloor expanded substantially in the Early Triassic, peaking during the latest Permian to mid-Griesbachian, the late Griesbachian to mid-Dienerian, the Smithian-Spathian transition, and the Early/Middle Triassic transition. Comparisons of the U-, C-, and Sr-isotope records with a modeled seawater PO4 3- concentration curve for the Early Triassic suggest that elevated marine productivity and enhanced oceanic stratification were likely the immediate causes of expanded oceanic anoxia. The patterns of redox variation documented by the U-isotope record show a good first-order correspondence to peaks in ammonoid extinctions during the Early Triassic. Our results indicate that multiple oscillations in oceanic anoxia modulated the recovery of marine ecosystems following the latest Permian mass extinction.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Science Advances
volume
4
issue
4
publisher
American Association for the Advancement of Science (AAAS)
external identifiers
  • scopus:85045769156
ISSN
2375-2548
DOI
10.1126/sciadv.1602921
language
English
LU publication?
yes
id
3705a2e7-c7f6-4ab8-b3bb-b14d2fbb91f5
date added to LUP
2018-05-02 15:53:23
date last changed
2018-10-21 04:55:53
@article{3705a2e7-c7f6-4ab8-b3bb-b14d2fbb91f5,
  abstract     = {<p>Explaining the ∼5-million-year delay in marine biotic recovery following the latest Permian mass extinction, the largest biotic crisis of the Phanerozoic, is a fundamental challenge for both geological and biological sciences. Ocean redox perturbations may have played a critical role in this delayed recovery. However, the lack of quantitative constraints on the details of Early Triassic oceanic anoxia (for example, time, duration, and extent) leaves the links between oceanic conditions and the delayed biotic recovery ambiguous. We report high-resolution U-isotope (δ<sup>238</sup>U) data from carbonates of the uppermost Permian to lowermost Middle Triassic Zal section (Iran) to characterize the timing and global extent of ocean redox variation during the Early Triassic. Our δ<sup>238</sup>U record reveals multiple negative shifts during the Early Triassic. Isotope mass-balance modeling suggests that the global area of anoxic seafloor expanded substantially in the Early Triassic, peaking during the latest Permian to mid-Griesbachian, the late Griesbachian to mid-Dienerian, the Smithian-Spathian transition, and the Early/Middle Triassic transition. Comparisons of the U-, C-, and Sr-isotope records with a modeled seawater PO<sub>4</sub> <sup>3-</sup> concentration curve for the Early Triassic suggest that elevated marine productivity and enhanced oceanic stratification were likely the immediate causes of expanded oceanic anoxia. The patterns of redox variation documented by the U-isotope record show a good first-order correspondence to peaks in ammonoid extinctions during the Early Triassic. Our results indicate that multiple oscillations in oceanic anoxia modulated the recovery of marine ecosystems following the latest Permian mass extinction.</p>},
  articleno    = {e1602921},
  author       = {Zhang, Feifei and Romaniello, Stephen J. and Algeo, Thomas J. and Lau, Kimberly V. and Clapham, Matthew E. and Richoz, Sylvain and Herrmann, Achim D. and Smith, Harrison and Horacek, Micha and Anbar, Ariel D.},
  issn         = {2375-2548},
  language     = {eng},
  month        = {04},
  number       = {4},
  publisher    = {American Association for the Advancement of Science (AAAS)},
  series       = {Science Advances},
  title        = {Multiple episodes of extensive marine anoxia linked to global warming and continental weathering following the latest Permian mass extinction},
  url          = {http://dx.doi.org/10.1126/sciadv.1602921},
  volume       = {4},
  year         = {2018},
}