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＜departmental bulletin paper＞
Dolomite from the Ishizaki mine, Hokkaido
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| Abstract | Mineralogical and petrological descriptions are given to dolomite rocks, which form lenticular bodies in the Paleozoic slate and are accompanied by rhodochrosite replacement deposits of the Ishizaki m...ine, Hokkaido. The dolomite can be classified into two types as follows: (1) Coarse-grained dolomite containing a large amount of flat breccias of slate. The dolomite being crystalized in the earlier stage has more iron. Its modes of occurrence and lithology are considered to indicate that it is a precipitation product in the fracture zone formed in slate by uprising hydrothermal solution which preceded the rhodochrosite metallization of the Miocene age. (2) Fine-grained dolomite composed of ironpoor dolomite. It occurs as small fragments and is considered as dolomitized limestone which was included as breccias in the Paleozoic slate. The dolomitization of (1) and (2) types is inferred to have taken place simultaneously.show more |
| Table of Contents | 1. はじめに 2. 苦灰岩の分布および形態 3. 苦灰岩の岩質 4. 苦灰石の化学組成 5. 苦灰石のX線粉末回折線 6. むすぴ |
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1.93 MB | 168 |
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| Created Date | 2021.11.12 |
| Modified Date | 2022.06.20 |