1997 Fiscal Year Final Research Report Summary
The process of formation of rare metal-bearing phosphates by hydrothermal alteration.
| Project/Area Number |
08640615
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | National Science Museum |
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Principal Investigator |
MATSUBARA Satoshi National Science Museum, Department of Geology, Chief Curator of Division, 地学研究部, 室長 (40000137)
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| Co-Investigator(Kenkyū-buntansha) |
MIYAWAKI Ritsuro National Science Museum, Department of Geology, Senior Curator of Division, 地学研究部, 主任研究官 (80290865)
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| Project Period (FY) |
1996 – 1997
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| Keywords | trolleite / gorceixite / goyazite / crandallite / woodhouseite / phosphate minerals |
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| Research Abstract |
The studied materials were collected from Yamaguchi Prefecture, Shimane prefecture, Saga Prefecture, and Kagoshima Prefecture. Many phosphate minerals are recognized from the Hinomaru-Nako mine, Abu-cho, Yamaguchi Prefecture. Among them, trolleite, gorceixite and goyazite are firstly found in Japan. They are closely associated and barium and minor strontium are concentrated in gorceixite, only strontium is in goyazite. Though both minerals are isostructural, no complite solidsolution exists between them under the condition of hydrothermal alteration. Gorceixite and goyazite do not include REE in spite of their close association with isostructural florencite- (Ce). REE-bearing crandallite and woodhouseite are found in alunite rock from the alteration rigion around Makurazaki, Kagoshima Prefecture and Ugusu, Shizuoka Prefecture. The sequence of concentration of rare metal and assemblage of anions during the hydrothermal alteration is recognized under the chemical analyzes and observatoin of back-scattered electron images. For example, the assemblage of anions is (PO_4) (PO_4), (PO_4) (SO_4) and (SO_4) (SO_4) in order of stage of formation.
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