Calibrating Late Quaternary terrestrial climate signals: radiometrically dated pollen evidence from the southern Sierra Nevada,USA |
| |
| Institution: | 1. MS 955, U.S. Geological Survey, Reston, VA 20192, USA;2. MS 902, U.S. Geological Survey, Menlo Park, California 94025, USA;1. Department of Geology, Quaternary Sciences, Lund University, Lund Sweden;2. Department of Geological Sciences and the Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden;3. Laboratoire des Sciences du Climat et de l''Environnement, 91191 Gif-sur-Yvette Cedex, France;4. Patagonian Research Foundation, Puerto Williams, Chile;1. Faculty of Chemistry, Kharazmi University, 43 Mofateh Ave., Tehran 1571914911, Iran;2. Iranian National Institute for Oceanography and Atmospheric Science, No. 3, Etemadzadeh St., Fatemi Ave., Tehran 1411813389, Iran;3. Department of Analytical Chemistry, Faculty of Chemistry, K. N. Toosi University of Technology, Tehran 16315-1355, Iran;1. Imaging Group, The Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking RH5 6NT, UK;2. Centre for Planetary Sciences, University College London, Gower Street, London WC1E 6BT, UK;3. Department of Earth Science & Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK;4. Department of Earth and Planetary Sciences, Birkbeck, University of London, Malet Street, London WC1E 7HX, UK;1. Department of Earth and Planetary Sciences, Northwestern University, Evanston, IL 60208, USA;2. Department of Earth System Science, Stanford University, Stanford, CA 94305, USA;3. State Key Laboratory of Biogeology and Environmental Geology, School of Earth Sciences and Resources, China University of Geosciences, Beijing, China;4. Department of Earth Sciences, Durham University, Durham, DH1 3LE, UK;5. Department of Geological Sciences, Stanford University, Stanford, CA 94305, USA;1. Department of Earth and Planetary Sciences, University of New Mexico, 200 Yale Blvd, Albuquerque, NM 87131, USA;2. Center for Stable Isotopes, University of New Mexico, 200 Yale Blvd, Albuquerque, NM 87131, USA;3. Geowissenschaftliches Zentrum, Georg-August-Universität, Goldschmidtstraße 1, D-37073 Göttingen, Germany;4. School of Earth and Space Exploration, Arizona State University, PO Box 871404, Tempe, AZ 85287-1404, USA;5. School of Molecular Sciences, Arizona State University, PO Box 871404, Tempe, AZ 85287-1404, USA;1. Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD 21218, USA;2. American Museum of Natural History, Sackler Institute for Comparative Genomics, New York, NY 10024, USA |
| |
| Abstract: | We constructed a radiometrically calibrated proxy record of Late Pleistocene and Holocene climate change exceeding 230,000 yr duration, using pollen profiles from two cores taken through age-equivalent dry lakes—one core having greater age control (via 230Th alpha mass-spectrometry) and the other having greater stratigraphic completeness. The better dated of these two serial pollen records (Searles Lake) served as a reference section for improving the effective radiometric age control in a nearby and more complete pollen record (Owens Lake) because they: (1) are situated ～90 km apart in the same drainage system (on, and immediately leeward of, the eastern flank of the Sierra Nevada), and (2) preserved strikingly similar pollen profiles and concordant sequences of sedimentological changes. Pollen assemblages from both lakes are well preserved and diverse, and document serial changes in Late Pleistocene and Holocene plant zone distribution and composition in the westernmost Great Basin; they consist of taxa now inhabiting montane forest, woodland, steppe, and desert-scrub environments. The studied core intervals are interpreted here to be the terrestrial equivalent of marine δ18O stages 1 through 9; these pollen profiles now appear to be among the best radiometrically dated Late Pleistocene records of terrestrial climate change known. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
