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Geology; September 2000; v. 28; no. 9; p. 771-774; DOI: 10.1130/0091-7613(2000)28<771:IEOPNO>2.0.CO;2
© 2000 Geological Society of America
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Isotope evidence of paleo–El Niño–Southern Oscillation cycles in loess-paleosol record in the central United States

Hong Wang1, Leon R. Follmer1 and Jack Chao-li Liu1

1 Illinois State Geological Survey, 615 Peabody, Champaign, Illinois 61820, USA

The {delta}13C of soil carbonate in rhizoconcretions collected from a loess-paleosol sequence in the central United States indicates that growing-season C3/C4 plant ratio oscillated by 35% on a 900 ± 200 yr time scale during the late Wisconsinan glaciation. The pattern appears in phase with advance and retreat of the southern margin of the Laurentide ice sheet, suggesting influence by paleo–El Niño–Southern Oscillation cycles. The {delta}13C of soil organic matter indicates that the annual average C3/C4 plant ratio oscillated only by 18%, with a periodicity of 450 ± 100 yr, and closely matched the cyclic pattern of loess-paleosol layers. It suggests a periodic enhancement of the penetration of the Gulf of Mexico air over the region during this time.

Key Words: carbon isotope • loess-paleosol • glacial phase • paleo-ENSO cycle




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