ボ-リングデ-タベ-スを用いた大阪・京都・亀岡盆地表層堆積物の層相解析

概要

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Facies analysis of sediments based on the boring database systems of the Osaka, Kyoto, and Kameoka basins situated in the central part of the Kinki district, Japan, have been carried out to correlate their subsurface sediments. The analytical method is the one which calculates the appearance percentage of clay, sand, and gravel at the same elevations and at 0.5m intervals in each of the basins, and then smooths these data using the moving average method for 21 terms. As a result, it has been revealed that the fluctuations in the appearance percentage of clay in the Osaka basin occur with a frequency very similar to the fluctuations of oxygen-isotope ratio in the upper part of core V28-239 raised from the Solomon Rise at lat 3°15′N, long 159°11′E from a depth of 3, 490m. Furthermore, the fluctuation patterns of the appearance percentage of gravel in each of the basins are similar to one another, which suggests a common sedimentation related to the global paleoclimate in the basins of the same drainage system.Spectral analysis using the Maximum Entropy Method (MEM) reveals that the appearance percentage of clay and sand in the Osaka basin each have a preeminent period of about 30m, while gravels in the northern part of the Kyoto basin and the Kameoka basin have a 12-13m period in common.
日本第四紀学会の論文