Magnitude and Duration of Late Ordovician-Early Silurian Glaciation
Understanding ancient climate changes is hampered by the inability to disentangle trends in ocean temperature from trends in continental ice volume. We used carbonate "clumped" isotope paleothermometry to constrain ocean temperatures, and thereby estimate ice volumes, through the Late Ordo...
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| Veröffentlicht in: | Science (American Association for the Advancement of Science) 2011-02, Vol.331 (6019), p.903-906 |
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| container_title | Science (American Association for the Advancement of Science) |
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| creator | Finnegan, Seth Bergmann, Kristin Eiler, John M Jones, David S Fike, David A Eisenman, Ian Hughes, Nigel C Tripati, Aradhna K Fischer, Woodward W |
| description | Understanding ancient climate changes is hampered by the inability to disentangle trends in ocean temperature from trends in continental ice volume. We used carbonate "clumped" isotope paleothermometry to constrain ocean temperatures, and thereby estimate ice volumes, through the Late Ordovician-Early Silurian glaciation. We find tropical ocean temperatures of 32° to 37°C except for short-lived cooling by approximately 5°C during the final Ordovician stage. Evidence for ice sheets spans much of the study interval, but the cooling pulse coincided with a glacial maximum during which ice volumes likely equaled or exceeded those of the last (Pleistocene) glacial maximum. This cooling also coincided with a large perturbation of the carbon cycle and the Late Ordovician mass extinction. |
| doi_str_mv | 10.1126/science.1200803 |
| format | Article |
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| source | American Association for the Advancement of Science; Jstor Complete Legacy |
| subjects | Biodiversity Carbonates Cooling Earth Extinction Geological time Glacial landforms Glaciers Ice sheets Late Ordovician epoch Ocean temperature Paleoclimatology Temperature measurement |
| title | Magnitude and Duration of Late Ordovician-Early Silurian Glaciation |
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