1995 Fiscal Year Final Research Report Summary
Granite petrogenesis in the light of the correspondence between the chemical zoning and isotope zoning in a single crystal
| Project/Area Number |
06640618
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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 |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | Naruto Univ.of Education, Faculty of Science |
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Principal Investigator |
MURATA Mamoru Naruto Univ.of Education Assistant Professor, 学校教育学部, 助教授 (80239532)
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| Co-Investigator(Kenkyū-buntansha) |
OZAWA Hiroaki Naruto Univ.of Education Assistant, 学校教育学部, 助手 (60253241)
NISHIMURA Hiroshi Naruto Univ.of Education Professor, 学校教育学部, 教授 (30029722)
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| Project Period (FY) |
1994 – 1995
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| Keywords | SIMS / Boron isotope / Granite petrogenesis / Tourmaline |
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| Research Abstract |
Boron isotope zoning in a tourmaline crystal could be determined first with SIMS in Japan. The isotope data were corrected by the effect of coexisting elements. Our data, therefore, are more accurate than those of foreign investigators.
Chemical compositions of tourmalines from granitic rocks, Southwest Outer-zone, Japan, were determined with EPMA.The results show that the chemical features of tourmalines inherited from those of granitic magmas. Tourmaline, therefore, can be a useful petrogenetic indicator mineral. Boron isotope has been interpreted to reflect source material such as mantle and continental crust. Boron isotote zoning using SIMS and chemical zoning using EPMA from a tourmaline crystal were banded together in order to discuss the granite petrogenesis strictly. The chemical variation of tourmaline shows normal zoning. No variation of boron isotope in tourmaline is present. This fact shows that the interaction between mantle material and continental crust during the formation of granitic rocks is negligible
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