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A peculiar sandstone, in which grains are almost wholly made up of serpentine discs, was found in the Tertiary deposits in Hokkaido. This sandstone can be called washed serpentine graywacke, in which ...the serpentine discs are mineralogically identified largely as lizardite. In spite of the mineralogically immature character, the sandstone comprises very well-rounded grains. The composition of the sandstone indicates that serpentinite was the main source and that crystalline schists of the glaucophane facies was the subordinate one. This sandstone is warrantably referred to the lower Middle Miocene Takinoue Formation of the Kawabata Series which is called a kind of “molasses” type sediments. It presents a peculiar example of post-orogenic sediments derived from the Kamuikotan metamorphic belt with little transportation.続きを見る
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Mendeley出力
15_01_p023