noaa-other-16035 North Horn Formation, Utah Paleocene-Eocene Thermal Maximum Clumped Isotopes VanDeVelde, J.H.; Bowen, G.J.; Passey, B.H.; Bowen, B.B. North Horn Formation, Utah Paleocene-Eocene Thermal Maximum Clumped Isotopes 2014-01-21 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/16035 Investigator J.H. VanDeVelde Investigator G.J. Bowen Investigator B.H. Passey Investigator B.B. Bowen earth science paleoclimate others geoscientificInformation thermal maximum 57000000 cal yr BP 55000000 cal yr BP Complete 39.4109 39.4109 -111.6994 -111.6994 1980 1980 Continent North America United States Of America Utah Axhandle Canyon>LATITUDE 39.4109>LONGITUDE -111.6994 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Justin H. VanDeVelde, Gabriel J. Bowen, Benjamin H. Passey, Brenda B. Bowen 2013 Geochimica et Cosmochimica Acta 109 254-267 10.1016/j.gca.2013.02.005 http://www.sciencedirect.com/science/article/pii/S0016703713000823

The precipitation of primary dolomite in soil is rare and controversial, and its occurrence indicates highly unusual geochemical and climatic conditions. We utilize isotopic and petrographic techniques, including clumped isotope thermometry, to evaluate diagenetic alteration and preservation of primary climatic signal in dolomitic paleosol nodules from a section spanning the Paleocene-Eocene boundary in central Utah. Isotopic measurements differentiate samples into groups that may be interpreted in terms of alteration; however moderate burial depths and extreme warmth during the interval of soil formation make it difficult to reach definitive conclusions from isotope values alone. With the addition of petrographic analysis, including cathodoluminescence and scanning electron microscopy, we are able to identify textural differences between samples suggesting differing amounts of recrystallization. We conclude that while some nodules have experienced significant diagenetic alteration the original nodule mineralogy is dolomite, and the majority of sampled nodules retain a primary paleoclimate signal. Early Paleogene temperatures recorded at this site are considerably warmer than those suggested for the continental interior from alternate proxies, a result that may be partially the result of the clumped isotope temperatures recording warm season soil temperatures, rather than mean annual air temperature. Soil water isotopic composition is suggestive of heightened aridity, particularly through the Paleocene-Eocene Thermal Maximum (PETM). STUDY NOTES: Clumped isotope study of pedogenic carbonates from North Horn Fm. paleosols

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/vandevelde2013/axhandle2013.txt Axhandle Canyon Clumped Isotopes; Formatted Text File USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11