The DOI matches its Crossref record; 38 of the 38 references it cites were found in a registry or an index.
Rapid expansion of oceanic anoxia immediately before the end-Permian mass extinction
Open accessAbstract
Periods of oceanic anoxia have had a major influence on the evolutionary history of Earth and are often contemporaneous with mass extinction events. Changes in global (as opposed to local) redox conditions can be potentially evaluated using U system proxies. The intensity and timing of oceanic redox changes associated with the end-Permian extinction horizon (EH) were assessed from variations in 238 U/ 235 U ( δ 238 U) and Th/U ratios in a carbonate section at Dawen in southern China. The EH is characterized by shifts toward lower δ 238 U values (from -0.37‰ to -0.65‰), indicative of an expansion of oceanic anoxia, and higher Th/U ratios (from 0.06 to 0.42), indicative of drawdown of U concentrations in seawater. Using a mass balance model, we estimate that this isotopic shift represents a sixfold increase in the flux of U to anoxic facies, implying a corresponding increase in the extent of oceanic anoxia. The intensification of oceanic anoxia coincided with, or slightly preceded, the EH and persisted for an interval of at least 40,000 to 50,000 y following the EH. These findings challenge previous hypotheses of an extended period of whole-ocean anoxia prior to the end-Permian extinction.
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Cites
The geochemistry of redox sensitive trace metals in sediments
Morford, J. L., & Emerson, S. (1999) · Geochimica et Cosmochimica Acta · doi:10.1016/s0016-7037(99)00126-x · Cited by 1,215
Oceanic Anoxia and the End Permian Mass Extinction
Wignall, P. B., & Twitchett, R. J. (1996) · Science · doi:10.1126/science.272.5265.1155 · Cited by 1,196
Permo-Triassic Boundary Superanoxia and Stratified Superocean: Records from Lost Deep Sea
Isozaki, Y. (1997) · Science · doi:10.1126/science.276.5310.235 · Cited by 842
Photic Zone Euxinia During the Permian-Triassic Superanoxic Event
Grice, K., Cao, C., Love, G. D., Böttcher, M. E., Twitchett, R. J., Grosjean, E., Summons, R. E., Turgeon, S. C., Dunning, W., & Jin, Y. (2005) · Science · doi:10.1126/science.1104323 · Cited by 823
Modern and ancient continental shelf anoxia: an overview
Tyson, R. V., & Pearson, T. H. (1991) · Geological Society, London, Special Publications · doi:10.1144/gsl.sp.1991.058.01.01 · Cited by 781
Uranium in the oceans: Where it goes and why
Klinkhammer, G. P., & Palmer, M. R. (1991) · Geochimica et Cosmochimica Acta · doi:10.1016/0016-7037(91)90024-y · Cited by 703
Uranium in open ocean: concentration and isotopic composition
Ku, T.-L., Mathieu, G. G., & Knauss, K. G. (1977) · Deep Sea Research · doi:10.1016/0146-6291(77)90571-9 · Cited by 651
Natural fractionation of 238U/235U
Weyer, S., Anbar, A. D., Gerdes, A., Gordon, G. W., Algeo, T. J., & Boyle, E. A. (2008) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2007.11.012 · Cited by 509
Self-citationKump, L. R., Pavlov, A., & Arthur, M. A. (2005) · Geology · doi:10.1130/g21295.1 · Cited by 501
Bond, D. P. G., & Wignall, P. B. (2010) · Geological Society of America Bulletin · doi:10.1130/b30042.1 · Cited by 494
Cited by
Paleoceanographic applications of trace-metal concentration data
Algeo, T. J., & Rowe, H. (2012) · Chemical Geology · doi:10.1016/j.chemgeo.2011.09.002 · Cited by 537
Self-citationOcean acidification and the Permo-Triassic mass extinction
Clarkson, M. O., Kasemann, S. A., Wood, R. A., Lenton, T. M., Daines, S. J., Richoz, S., Ohnemueller, F., Meixner, A., Poulton, S. W., & Tipper, E. T. (2015) · Science · doi:10.1126/science.aaa0193 · Cited by 364
Penn, J. L., Deutsch, C., Payne, J. L., & Sperling, E. A. (2018) · Science · doi:10.1126/science.aat1327 · Cited by 362
Marine productivity changes during the end-Permian crisis and Early Triassic recovery
Shen, J., Schoepfer, S. D., Feng, Q., Zhou, L., Yu, J., Song, H., Wei, H., & Algeo, T. J. (2015) · Earth-Science Reviews · doi:10.1016/j.earscirev.2014.11.002 · Cited by 329
Self-citationMarine anoxia and delayed Earth system recovery after the end-Permian extinction
Lau, K. V., Maher, K., Altiner, D., Kelley, B. M., Kump, L. R., Lehrmann, D. J., Silva-Tamayo, J. C., Weaver, K. L., Yu, M., & Payne, J. L. (2016) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.1515080113 · Cited by 294
Metadata
- Authors
- Brennecka, G. A., Herrmann, A. D., Algeo, T. J., & Anbar, A. D.
- Venue
- Proceedings of the National Academy of Sciences
- Published
- 2011-10-10
- Volume
- 108
- Issue
- 43
- Pages
- 17631-17634
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- OpenAlex
- W2107474811
- Cited by
- 358
- References
- 38
- FWCI
- 12.29
- Type
- journal article
- Language
- en
- Open access
- green
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