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Isotopic Evidence for Glaciation During the Cretaceous Supergreenhouse
Abstract
The Turonian (93.5 to 89.3 million years ago) was one of the warmest periods of the Phanerozoic eon, with tropical sea surface temperatures over 35°C. High-amplitude sea-level changes and positive δ 18 O excursions in marine limestones suggest that glaciation events may have punctuated this episode of extreme warmth. New δ 18 O data from the tropical Atlantic show synchronous shifts ∼91.2 million years ago for both the surface and deep ocean that are consistent with an approximately 200,000-year period of glaciation, with ice sheets of about half the size of the modern Antarctic ice cap. Even the prevailing supergreenhouse climate was not a barrier to the formation of large ice sheets, calling into question the common assumption that the poles were always ice-free during past periods of intense global warming.
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Citations
Cited by
O'Brien, C. L., Robinson, S. A., Pancost, R. D., Sinninghe Damsté, J. S., Schouten, S., Lunt, D. J., Alsenz, H., Bornemann, A., Bottini, C., Brassell, S. C., et al. (2017) · Earth-Science Reviews · doi:10.1016/j.earscirev.2017.07.012 · Cited by 586
Self-citationOxygen Isotopes in Foraminifera: Overview and Historical Review
Pearson, P. N. (2012) · The Paleontological Society Papers · doi:10.1017/s1089332600002539 · Cited by 214
Palaeogeographic controls on climate and proxy interpretation
Lunt, D. J., Farnsworth, A., Loptson, C., Foster, G. L., Markwick, P., O'Brien, C. L., Pancost, R. D., Robinson, S. A., & Wrobel, N. (2016) · Climate of the Past · doi:10.5194/cp-12-1181-2016 · Cited by 145
An early Cambrian greenhouse climate
Hearing, T. W., Harvey, T. H. P., Williams, M., Leng, M. J., Lamb, A. L., Wilby, P. R., Gabbott, S. E., Pohl, A., & Donnadieu, Y. (2018) · Science Advances · doi:10.1126/sciadv.aar5690 · Cited by 120
Geobiological constraints on Earth system sensitivity to CO2 during the Cretaceous and Cenozoic
ROYER, D. L., PAGANI, M., & BEERLING, D. J. (2012) · Geobiology · doi:10.1111/j.1472-4669.2012.00320.x · Cited by 95
Metadata
- Authors
- Bornemann, A., Norris, R. D., Friedrich, O., Beckmann, B., Schouten, S., Damsté, J. S. S., Vogel, J., Hofmann, P., & Wagner, T.
- Venue
- Science
- Published
- 2008-01-11
- Volume
- 319
- Issue
- 5860
- Pages
- 189-192
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2086254897
- Cited by
- 270
- References
- 0
- FWCI
- 15.21
- Type
- journal article
- Language
- en
- Open access
- closed
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
