DOI: 10.1016/j.palaeo.2014.10.019
论文题名: Diatom-inferred salinity changes from the Yushe paleolake indicate an aridification during the Pliocene-Pleistocene transition in north China
作者: Li Y.-M. ; Ferguson D.K. ; Zhao Q. ; Wang Y.-F. ; Wang R.-X. ; Li C.-S.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 417 起始页码: 544
结束页码: 553
语种: 英语
英文关键词: Aridification
; Diatoms
; North China
; Paleolimnology
; Pliocene-Pleistocene transition
; Zhangcun
英文摘要: The global climate changed significantly during the Pliocene-Pleistocene transition, and a worldwide aridification occurred.In order to investigate the influence of the aridification during the Pliocene-Pleistocene transition in the East Asian interior, diatom assemblages from the Upper Zhangcun Formation, north China, deposited during 2.7-2.5. Ma BP were analyzed, and the lake salinity was reconstructed using diatom-environment transfer functions.A total of 74 diatom taxa were found in the sediments, belonging to 21 families and 32 genera. Four zones were established from the bottom to the top, based on the changes in the diatom assemblages over the 15.7m sediment sequence. In Zone 1, Cyclotella iris dominated in assemblage while Caloneis westii and Staurosira construens were less presented among representative species. In Zone 2, C. iris dominated, which indicates carbonate-rich water. But in Zone 3, benthic pennate taxa such as C. westii and Anomoeoneis sphaerophora became more abundant, indicating a significant increase in water salinity, from carbonate type to sulfate type, caused by climatic change. In Zone 4, C. iris became dominant again, with abundant Gomphonema intricatum and rare Pinnularia rathsbergiana and Martyana martyi species. The salinity inferred by conductivity reconstruction increased from 1.9ppt in Zone 2 to 4.1ppt in Zone 3. The significant changes of anion ratio (Alk/(Cl-+SO42-)) indicate an abrupt change from carbonate-rich to a sulfatic type water.The increase of salinity reflects changes in the precipitation. -evaporation balance. The change from carbonate to sulfatic water inferred from the diatom assemblages could indicate a significant aridification around ca. 2.6. Ma BP on the eastern edge of the Loess Plateau. This is the most easterly record of aridification across the Eastern Asian interior and may be related with the global cooling and the development of the Northern Hemisphere glaciation. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69097
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Institute of Geology and Paleontology, Linyi University, Linyi, Shandong Province, China; State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing, China; College of Life Science, Capital Normal University, Beijing, China; Institute of Palaeontology, University of Vienna, Vienna, Austria
Recommended Citation:
Li Y.-M.,Ferguson D.K.,Zhao Q.,et al. Diatom-inferred salinity changes from the Yushe paleolake indicate an aridification during the Pliocene-Pleistocene transition in north China[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,417