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Late Miocene-Pliocene development of asian aridification as recorded in the Red-Earth Formation in northern China

Late Miocene-Pliocene development of Asian aridification as ...

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中国科学院地质与地球物理研究所2004学术年会

作者： Pierre E.Biscaye Tungsheng Liu Lamont-Doherty Earth Observatory of Columbia University PO Box 1000PalisadesNY 10964-8000.USA Institute of Geology and Geophysics Chinese Academy of Sciences

In northern China,the Late Miocene-Pliocene Hipparion Red-Earth Formation in the eastern Loess Plateau fills a gap of climate records between the well-known loess-soil sequences of the last 2.6 Ma and the Miocene loess-soil sequences from the western Loess *** studies on type sections indicate that a major part of the Red-Earth Formation is also of windblown origin,covering the period from～7-8 to～2.6 Ma *** the eolian dust deposited in the region originated from the asian desert lands,the Red-Earth must contain a record of the aridification history of the asian *** this study,the Xifeng type section in the eastern Loess Plateau is studied to assess the development of asian aridification during Late Miocene-Pliocene *** dust deposition continued at the central Loess Plateau since-6.2 Ma BP,indicating that sizable desert lands in the interior of Asia and the asian winter monsoon must have been constantly maintained during Late Miocene-Pliocene time,and were able to provide a significant amount of eolian *** aridity in the source areas was stronger from～6.2 to～5 Ma BP and weaker from～5 to～3.6 Ma *** major aridification steps are observed at-3.6 and～2.6 Ma BP,*** intensification of eolian deposition at-3.6 Ma BP is synchronous with a suggested uplift of portions of the Tibetan *** general aridification history is also highly consistent with the ongoing high-latitude cooling and the consequent expansion of Arctic sea-ice/ice sheets during this *** results therefore suggest that both Tibetan uplift and ice-building processes in the northern hemisphere were two prominent driving forces behind the long-term desertification in the interior of Asia during Late Miocene and Pliocene time.

关键词： east asian aridification Miocene-Pliocene eolian deposition Winter monsoon Hipparion Red-Earth Formation

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