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dc.contributor.author Larsen, Kari
dc.contributor.author Holterhoff, Peter
dc.contributor.author Montañez, Isabel
dc.contributor.author Griffin, Julie
dc.coverage.temporal Paleozoic Geologic Period
dc.date.accessioned 2019-11-26T17:19:40Z
dc.date.available 2019-11-26T17:19:40Z
dc.date.issued 2019-11-26
dc.identifier.uri http://hdl.handle.net/10211.3/214314
dc.description.abstract Carboniferous and Permian cyclothems record eccentricity-forced (100ky and 400ky) fluctuations in glacioeustasy (the rise and fall of sea levels due to the melting and growing of ice sheets during glacials and interglacials) during the Late Paleozoic Ice Age (LPIA), Earth’s penultimate icehouse. The magnitude of change in the oxygen isotopic composition of conodonts (δ18OPO4), apatite microfossils (Fig. 1), within one cyclothem proxies the amount of glacioeustatic change. However, it is impossible to determine if conodont δ18OPO4 documents changes in global ice volume, ocean temperature, and/or regional precipitation patterns. Global circulation modeling (GCM) indicates that precession (20ky; the change in the rotation of the Earth’s axis) drove fluctuations in the intensity of tropical precipitation during the LPIA (Horton et al., 2012; Heavens et al., 2015). These additions of fresh water and periods of increased evaporation likely modified seawater δ18O, and thus conodont δ18OPO4.
dc.description.sponsorship Geology
dc.language.iso en en_US
dc.subject Glacial epoch
dc.subject Global circulation modeling
dc.subject Conodonts
dc.title Orbital forcing of tropical precipitation during the Late Paleozoic Ice Age revealed by conodont oxygen isotope composition
dc.type Poster en_US
dc.date.updated 2019-11-26T17:19:41Z

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