チベット高原色林錯の湖底堆積物の粒度組成の変動と古水文環境

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Grain-size variations in the bottom sediment of Siling-co in central Tibet reveal the paleo-hydrological environments in the Tibetan plateau during the last 12,000 years. The age of the sediment was estimated from ^<14>C dates obtained by Tandetron Accelerater Mass Spectrometry done at Nagoya University (the usual method (liquid scintillation) also was used). The area around the lake was arid or semi-arid berofe 10,000 yr B.P. (late last glacial period), water inflow being small and the level of the lake low. At about 10,000 yr B.P. (early postglacial period) it became markedly humid and the water level rose rapidly because of large inflows surrounding basins ; melting water and large precipitation. The climate was humid and the level of the lake high for a while. At about 2,000-3,500 yrB.P. it again became arid within a short time and the water level dropped. After this short arid interval and low water level, it again became humid and the water inflow increased. Large inflows continued for a time after which it again began to be slightly arid.
名古屋大学の論文