Depositional environments and a paleogeographic position for the Pleistocene basal part of the Karasuma Deep Drilling Core from Lake Biwa, central Japan

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  • 琵琶湖“烏丸ボーリング”最下部の堆積環境とその古地理上の位置

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The site of the Karasuma Deep Drilling at the southern part of Lake Biwa, the largest in Japan, was located west of the earlier main fluvial valley recognized above the basement topography under the thick sediment of the lake bottom. Depositional environments during about 1.7-1.9 Ma at the site, analyzed from the facies of the lowermost sequence of the cores, indicate the existence of an alluvial fan and/or talus cone in a feeder valley. Then, the place changed to a shallow, narrow lake filled with floodwater from the main valley lake, which formed as a seismic naturally dammed lake. Furthermore, it gradually changed to a deeper, wider lake with fluctuating lake levels. The estimation indicates that older records may exist in the deposits filling the main valley above the basement surface.

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