Sequential changes in rock texture of Shimanto sandstone due to weathering in South Kyushu, Japan.

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  • 風化による砂岩の岩石組織の変化　　南九州における四万十帯砂岩の例
  • フウカ ニ ヨル サガン ノ ガンセキ ソシキ ノ ヘンカ ミナミキュウシュウ ニ オケル シマントタイ サガン ノ レイ

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Sequential changes in mineralogical properties due to weathering during 350 ka were examined using sandstone gravel in fluvial terrace deposits with a known emergence time which were distributed in the Miyazaki Plain, South Kyushu. Fe is increasingly concentrated and Si and alkali elements such as K, Na are increasingly leached from the sandstone matrix with the progress of weathering. Pores of gravel increase with weathering and can be correlated to the decrease of Si, K and Na contents.

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