Phosphate minerals in chert from Toyoda, Kochi, City, Japan. .
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- MATSUBARA SATOSHI
- Department of Geology, National Science Museum
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- SAITO YASUJI
- Department of Geology, National Science Museum
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- KATO AKIRA
- Department of Geology, National Science Museum
Bibliographic Information
- Other Title
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- 高知市豊田産チャート中の燐酸塩鉱物
Description
Wavellite, variscite, planerite and cacoxenite were found in chert from Toyoda, Kochi City, as the first occurrence of aluminum phosphate assemblage in sedimentary rocks in Japan. They were formed on walls of fractures therein under a near surface condition. The phosphate ion came from nearby fluorapatite seam after the decomposition by sulphuric acid generated from pyrite in the intercalated slate after oxidation.<br> The chemical analyses of wavellite, variscite, planerite and cacoxenite indicate wavellite to be a high fluorine material, variscite to be a nearly ideal one, planerite to be a copper-bearing one, and cacoxenite to be a highly aluminian material, respectively. The X-ray powder studies on variscite and fluorapatite specify the former to be Messbach-type and the latter to be very close to end member. Under such a near surface condition, different geochemical behaviours of Al from Fell leads to the formation of aluminum phosphates without any essential Fe3+.
Journal
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- JOURNAL OF MINERALOGY, PETROLOGY AND ECONOMIC GEOLOGY
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JOURNAL OF MINERALOGY, PETROLOGY AND ECONOMIC GEOLOGY 83 (4), 141-149, 1988
Japan Association of Mineralogical Sciences
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Details 詳細情報について
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- CRID
- 1390282681211914752
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- NII Article ID
- 130003728562
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- ISSN
- 18813275
- 09149783
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- Text Lang
- en
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed