ホウ素の同位体地球・宇宙科学 [in Japanese] Boron Isotope Geochemistry and Cosmochemistry [in Japanese]
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Progress and problems in the study of boron isotope geochemistry and cosmochemistry are reviewed in this article. The isotopic composition of natural boron (<sup>11</sup>B/<sup>10</sup>B) ranges from 3.95 to 4. 21, indicating a considerably large isotopic variation up to 60 per mil. This unique isotopic feature together with its incompatibility to mafic silicate minerals must enable us to investigate many geological phenomena, especially these related to alteration of the oceanic crust and subduction-related volcanism in island arc. Boron isotopic composition of meteorites can provide the important clues for understanding in nucleosynthesis at the early history of solar system and the early galaxy stage. Only little data of boron isotopic composition, however, are available to terrestrial and meteoritic materials because of difficulty of its measurement, making it difficult to use boron isotopic composition as a useful geochemical and cosmochemical tracer. Therefore, more detailed investigations are necessary in boron geochemistry and cosmochemistry.
Chikyukagaku 23(1), 23-34, 1989
The Geochemical Society of Japan