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＜departmental bulletin paper＞
Calcite grain coarsening by contact metamorphism in calcite marbles
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| Abstract | Grain coarsening of calcite by contact metamorphism was studied by measuring the grain-size of calcite in calcite marbles in the Katamuki Mountain's ring-dyke contact aureole, Oita Prefecture, Japan. ...The Miocene ring-dyke rocks consist of granite porphyry and quartz porphyry which intruded in Jurassic sediments. Calcite marbles are interbedded in Jurassic sediments called the Okugawachi Formation and have undergone thermal metamorphism in Miocene age. Equigranular calcite marbles which outcrop together with metapelites, metabasites and cherts show a systematic pattern of increasing grain-size towards the ringdyke contact. The mean diameter of calcite in calcite marbles increases with distance towards the contact by an exponential fashion. The grain-size distribution broadens with increase in the mean diameter towards the contact boundary, where the recrystallized grains are somewhat deformed and strain-induced suturing of grain boundaries is present between deformed grains and subgrains are often seen at the boundaries between large crystals. Therefore strain was induced in calcite marbles when the ring-dyke rocks intruded in them.show more |
| Table of Contents | I . はじめに II. 地質概略 III. 石灰岩の薄片観察 IV. 方解石の粒径測定 V. 粒径測定結果 VI. 考察 VII. まとめ |
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| Created Date | 2021.10.14 |
| Modified Date | 2022.06.20 |