1987 Fiscal Year Final Research Report Summary
Mineralogical Study on Phosphates in Sedimentary Rocks
| Project/Area Number |
61540597
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
鉱物学(含岩石・鉱床学)
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| Research Institution | National Science Museum |
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Principal Investigator |
MATSUBARA Satoshi National Science Museum, 地学研究部, 主任研究官 (40000137)
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| Co-Investigator(Kenkyū-buntansha) |
SAITO Yasuji National Science Museum, 地学研究部, 室長 (00000133)
KATO Akira National Science Museum, 地学研究部, 室長 (70000114)
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| Project Period (FY) |
1986 – 1987
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| Keywords | Sedimentary Rockc / Phosphates / Apatite Series Minerals / 藍鉄鉱系鉱物 |
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| Research Abstract |
Primary phosphates in sedimentary rocks in Japan are apatite series mineral and vivianite mineral. From banded cherts in several localities secondary Al-and/or Fe^<3+> -phasphates are newly found. They are the products from decomosition of neardy apatite series minerals by sulphuric acid generated from associated sulphides after oxidation. Viviantite serirs minerals are commonly found in lacustrine clayey sedimeuts. Under a near surface condition,they alter to an amorphous material or ocasionally limonite after loss of phosphoric acid. However,in a rare case,are observed Mn-bearing Fe^<3+>-phosphates replaced vivianite series minerals. The occurrence of these phosphates may be controlled by manganese contents in vivianite series minerals and degree of oxidation.
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