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dc.contributor.authorSelkin, Peter. A.
dc.contributor.authorStromberg, Caroline. A. E.
dc.contributor.authorDunn, Regan.
dc.contributor.authorKohn, Matthew. J.
dc.contributor.authorCarlini, Alfredo. A.
dc.contributor.authorDavies-Vollum, K. Siân
dc.contributor.authorMadden, Richard. H.
dc.date.accessioned2016-11-01T12:55:14Z
dc.date.available2016-11-01T12:55:14Z
dc.date.issued2015-05-19
dc.identifier.citationSelkin, P, Stromberg, C, Dunn, R, Kohn, M, Carlini, A, Davies-Vollum, K, & Madden, R 2015, 'Climate, dust, and fire across the Eocene-Oligocene transition, patagonia', Geology, 43 (7), p. 567en
dc.identifier.issn0091-7613
dc.identifier.issn1943-2682
dc.identifier.doi10.1130/G36664.1
dc.identifier.urihttp://hdl.handle.net/10545/620681
dc.description.abstractThe Eocene-Oligocene transition (EOT) is typically interpreted as a time of drastic global cooling and drying associated with massive growth of a glacial icecap in Antarctica and the shift to an “icehouse” climate. The effects of this transition on the terrestrial environments, floras, and faunas of the Southern Hemisphere, however, have been unclear. Here we document simultaneous changes in fire regime and plant community in Patagonia, Argentina. Decreases in the concentration of magnetite in loessites from the Eocene-Oligocene Vera Member of the Sarmiento Formation correlate with decreases in the fraction of burnt palm phytoliths as well as more consistently palm-dominated phytolith assemblages. Association of magnetite and burnt palm phytoliths suggests intense wildfires, which appear to have been suppressed for ~200 k.y. shortly after the EOT. The disappearance of fire-related characteristics near the EOT is possible if changes in regional wind patterns—consistent with observed changes in sediment particle sizes—caused changes in seasonal precipitation. These results imply a more important role for fire in structuring Eocene-Oligocene landscapes than previously thought
dc.language.isoenen
dc.publisherGeological Society of Americaen
dc.relation.urlhttp://geology.gsapubs.org/cgi/doi/10.1130/G36664.1en
dc.rightsArchived with thanks to Geologyen
dc.subjectClimate changeen
dc.subjectEocene-Oligoceneen
dc.subjectWildfiresen
dc.subjectGeologyen
dc.titleClimate, dust, and fire across the Eocene-Oligocene transition, Patagoniaen
dc.typeArticleen
dc.contributor.departmentSheffield Hallam Universityen
dc.identifier.journalGeologyen
dcterms.dateAccepted2015-04-15
html.description.abstractThe Eocene-Oligocene transition (EOT) is typically interpreted as a time of drastic global cooling and drying associated with massive growth of a glacial icecap in Antarctica and the shift to an “icehouse” climate. The effects of this transition on the terrestrial environments, floras, and faunas of the Southern Hemisphere, however, have been unclear. Here we document simultaneous changes in fire regime and plant community in Patagonia, Argentina. Decreases in the concentration of magnetite in loessites from the Eocene-Oligocene Vera Member of the Sarmiento Formation correlate with decreases in the fraction of burnt palm phytoliths as well as more consistently palm-dominated phytolith assemblages. Association of magnetite and burnt palm phytoliths suggests intense wildfires, which appear to have been suppressed for ~200 k.y. shortly after the EOT. The disappearance of fire-related characteristics near the EOT is possible if changes in regional wind patterns—consistent with observed changes in sediment particle sizes—caused changes in seasonal precipitation. These results imply a more important role for fire in structuring Eocene-Oligocene landscapes than previously thought


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