Global change at the Paleocene-Eocene boundary: climatic and evolutionary consequences of tectonic events
dc.contributor.author | Rea, David K. | en_US |
dc.contributor.author | Zachos, James C. | en_US |
dc.contributor.author | Owen, Robert M. | en_US |
dc.contributor.author | Gingerich, Philip D. | en_US |
dc.date.accessioned | 2006-04-10T13:40:50Z | |
dc.date.available | 2006-04-10T13:40:50Z | |
dc.date.issued | 1990-07 | en_US |
dc.identifier.citation | Rea, David K., Zachos, James C., Owen, Robert M., Gingerich, Philip D. (1990/07)."Global change at the Paleocene-Eocene boundary: climatic and evolutionary consequences of tectonic events." Palaeogeography, Palaeoclimatology, Palaeoecology 79(1-2): 117-128. <http://hdl.handle.net/2027.42/28490> | en_US |
dc.identifier.uri | http://www.sciencedirect.com/science/article/B6V6R-48F009F-P6/2/1f912234b358395f28f78bdb8718d45d | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/28490 | |
dc.description.abstract | Events of the Paleocene-Eocene boundary provide the clearest example to date of how a tectonic event may have global climatic consequences. Recent advances permit well-constrained stratigraphic determination of several events that occurred at that boundary, in chron C24R: a many-fold increase in sea-floor hydrothermal activity, a global warming, a reduction in the intensity of atmospheric circulation, a conversion to salinity-driven deep ocean circulation, a marked lightening of oceanic [delta]13C values, extinction and evolution of both benthic foraminifera and land mammals, and important place-boundary reorganizations including the outpouring of the east Greenland volcanics and the initiation of the oceanic rift between Norway and Greenland.We hypothesize that enhanced sea-floor hydrothermal activity occasioned by global tectonism resulted in a flooding of the atmosphere with CO2, causing a reduced pole-to-equator temperature gradient and increased evaporation at low latitudes. Increased formation of warm, salty, probably low-nutrient waters coupled with the warm temperatures at high latitudes occasioned a salinity-driven, rather than temperature-driven, deep-water circulation. This newly-evolved ocean circulation pattern changed the apportionment of global heat transport from the atmosphere to the ocean, with concomitant changes in the circulation intensity of both. Reduced intensity of atmospheric circulation resulted in lower oceanic biological productivity and enhanced seasonality of climate on the continents. A major extinction event among benthic foraminifera was probably a response to the new low-nutrient and chemically changed bottom waters, and endemism following rapid evolution and dispersal of mammalian orders may have been in response to the new continental climate regime. | en_US |
dc.format.extent | 919254 bytes | |
dc.format.extent | 3118 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.language.iso | en_US | |
dc.publisher | Elsevier | en_US |
dc.title | Global change at the Paleocene-Eocene boundary: climatic and evolutionary consequences of tectonic events | en_US |
dc.type | Article | en_US |
dc.rights.robots | IndexNoFollow | en_US |
dc.subject.hlbsecondlevel | Geology and Earth Sciences | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Department of Geological Sciences, The University of Michigan, Ann Arbor, MI 48109-1063, U.S.A. | en_US |
dc.contributor.affiliationum | Department of Geological Sciences, The University of Michigan, Ann Arbor, MI 48109-1063, U.S.A. | en_US |
dc.contributor.affiliationum | Department of Geological Sciences, The University of Michigan, Ann Arbor, MI 48109-1063, U.S.A. | en_US |
dc.contributor.affiliationum | Department of Geological Sciences, The University of Michigan, Ann Arbor, MI 48109-1063, U.S.A. | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/28490/1/0000285.pdf | en_US |
dc.identifier.doi | http://dx.doi.org/10.1016/0031-0182(90)90108-J | en_US |
dc.identifier.source | Palaeogeography, Palaeoclimatology, Palaeoecology | en_US |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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