| 概要 |
Several excellent crystals of zeolite, calcite, datolite and apophyllite are found in amygdaloidal cavities of biotite andesite, which is a neck intruded into Paleogene Kuma formation at Makinokawa qu...arry, Kuma-machi, Ehime Prefecture. Paragenic relation of minerals changes according to the height of druses of the neck in the quarry. In the lowest part of the quarry, the cavities are filled only with calcite or Mn-calcite. With increasing height, the mineral paragenesis changes from calcited-datolite-apophyllite through datolite-apophyllite-natrolite to heulandite-mordenite-stilbite. Finally in the uppermost part of the quarry, the cavities are filled up by chabazite. The chemical and physical data of the amygdale minerals are given, and morphological changes of calcite are discussed in relation to their occurrences. Some considerations are made on the concentration of volatile elements at the latest stage of magma's consolidation.続きを見る
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Mendeley出力
