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• W2012324561 abstract "As a contribution to the controversial discussion regarding the nature and extent of the Pleistocene glaciation on the Tibetan Plateau, additional observations and results were obtained during several Chinese-German joint expeditions. In the investigation area of the eastern and central Tibetan Plateau, it will be shown that the maximum extent of the last glaciation was limited to the glaciation of isolated mountain groups or smaller plateau glaciations. These glaciations are characterized by glacial erosional features such as U-shaped valleys in the inner mountain massifs and cirques in the higher summit areas. Accumulation forms, such as terminal and lateral moraines (less common than basal moraines) are marked by granitic and basaltic erratics. Using two examples from the eastern margin of the Tibetan Plateau (Nianbaoyeze Shan and northern Chola Shan), the extent of Pleistocene glaciations can be mapped by the distribution of terminal and lateral moraines and erratic granite boulders on the slopes of the surrounding schists. Two to three main Pleistocene glaciations can be separated using weathering criteria, paleosols, and the overlying stratum on the moraines and associated terrace sequences. Overlying stratum consist of aeolian sandy silt or solifluction debris. The younger moraines are found to be characterized by large erratics, were therefore named “Big-Boulder-Moraine”, and can be found over the investigated area. The ice free areas are characterized by Pleistocene terraces along the main rivers, loess deposits with sand and ice wedges at higher elevations (e.g. the basin of Zoige), and paleosols in the basins below 3500 m a.s.l. (e.g. Aba basin or Garzê basin). The hypothesis of an extensive plateau glaciation could not be verified for this region. A rising snowline (equilibrium-line altitudes = ELAs) is revealed in two cross-sections during the Last Glacial Maximum (LGM) at the eastern and northern margin of the Tibetan Plateau. Snowlines migrated from about 4000 m in the east (Minshan), to 4300 m in the Nianbaoyeze, and to about 4700 m in the west (Bayan Har Shan). A rise was also recorded from about 3800 m in the north (central Qilian Shan), up to a range of 4300–4950 m (different exposures) in the Kunlun Shan, to approximately 5200 m in the Tanggula Shan in the center of the Tibetan Plateau. The general increase of modern and LGM snowlines (or ELAs) towards the plateau corresponds with a decrease of precipitation from east to west and from north to south respectively. Precipitation was more pronounced at the eastern margin during glacial times than compared to present." @default.
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• W2012324561 date "1998-01-01" @default.
• W2012324561 modified "2023-09-26" @default.
• W2012324561 title "Extent and spatial distribution of Pleistocene glaciations in eastern Tibet" @default.
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• W2012324561 doi "https://doi.org/10.1016/s1040-6182(97)00010-4" @default.
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