Boron isotopic compositions of some boron minerals

Journal Article · Fri Dec 01 00:00:00 EST 1989 · Geochimica et Cosmochimica Acta; (USA)

DOI:https://doi.org/10.1016/0016-7037(89)90099-9· OSTI ID:6692913

Oi, Takao; Musashi, Masaaki; Ossaka, Tomoko; Kakihana, Hidetake ^[1]; Nomura, Masao; Okamoto, Makoto ^[2]

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1. Sophia Univ., Tokyo (Japan)
2. Tokyo Institute of Technology (Japan)

Boron minerals that have different structural formulae but are supposed to have the same geologic origin have been collected and analyzed for the {sup 11}B/{sup 10}B isotopic ratio. It has been reconfirmed that minerals of marine origin have higher {sup 11}B/{sup 10}B ratios than those of nonmarine origin. It has been found that the sequence of decreasing {sup 11}B/{sup 10}B values among the minerals with the same geologic origin is; borax, tincal, kernite (Na borates) > ulexite (Na/Ca borate) > colemanite, iyoite, meyerhofferite (Ca borates). This sequence is explainable on the basis of the difference in crystal structure among the minerals. That is, minerals with high BO{sub 3}/BO{sub 4} ratios, (the ratio of the number of the BO{sub 3} triangle units to the number of the BO{sub 4} tetrahedron units in the structural formula of a mineral) have higher {sup 11}B/{sup 10}B ratios.

• OSTI ID: 6692913
• Journal Information: Geochimica et Cosmochimica Acta; (USA), Vol. 53:12; ISSN 0016-7037
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
BORON COMPOUNDS
ISOTOPE RATIO
MINERALIZATION
PRECIPITATION
STRUCTURAL CHEMICAL ANALYSIS
BORON 10
BORON 11
CALCIUM COMPOUNDS
CHEMICAL COMPOSITION
CRYSTAL STRUCTURE
GEOCHEMISTRY
MINERALS
ORIGIN
PETROGENESIS
SEAWATER
SODIUM COMPOUNDS
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BORON ISOTOPES
CHEMISTRY
HYDROGEN COMPOUNDS
ISOTOPES
LIGHT NUCLEI
NUCLEI
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
OXYGEN COMPOUNDS
SEPARATION PROCESSES
STABLE ISOTOPES
WATER
580000* - Geosciences