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A Multi‐cycle Climatic Fluctuation Record of the Last Interglacial Period: Typical Stratigraphic Section in the Salawusu River Valley on the Ordos Plateau, China
Author(s) -
Baosheng LI,
ZHANG David Dian,
Xiaohao WEN,
Yuxiang DONG,
Yizhi ZHU,
Heling JIN
Publication year - 2005
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.2005.tb00905.x
Subject(s) - geology , interglacial , aeolian processes , period (music) , paleosol , plateau (mathematics) , loess , paleontology , facies , sedimentary rock , physical geography , quaternary , structural basin , geography , physics , mathematics , acoustics , mathematical analysis
Abstract The Last Interglacial Period strata in the Milanggouwan section in the Salawusu River valley on the Ordos Plateau, China, have 8.5 sedimentary cycles composed alternately of eolian dune sands, fluvio‐lacustrine facies and paleosols. Based on comprehensive analyses on the distribution of magnetic susceptibility and CaCO 3 and paleo‐ecology indicated by fossils in the region, it is considered that the sedimentation cycles resulted from dry‐cold and warm‐humid climate fluctuations. Magnetic susceptibility values and CaCO 3 contents in stratigraphic sectors I, III, V and II, IV basically respectively present peaks and low vales, and the former three can in time correlate with MIS5a, MIS5c and MISSe successively and the latter two with MISSb and MISSd. In addition, some horizons of eolian dune sands and the low vales of their magnetic susceptibility and CaCO 3 are also correlated with 6 periods of cooling events indicated by the higher content of foraminifer Neogloboquadrina pachydermia (S.) documented in the V29—191 drill in the North Atlantic and the cold events recorded by δ 18 O in the ice cores in GRIP, especially with 9 periods of dust events in Chinese Loess Plateau.