Abstract
The large relative mass difference between the two stable isotopes of boron, 10B and 11B, and the high geochemical reactivity of boron lead to significant isotope fractionation by natural processes. Published δ11B values (relative to the NBS SRM-951 standard) span a wide range of ≈ 90‰. The lowest δ11B values around — 30‰ are reported for non-marine evaporite minerals and certain tourmalines. The most 11B-enriched reservoir known to date are brines from Australian salt lakes and the Dead Sea of Israel with δ11B values up to +59‰. Dissolved boron in present-day seawater has a constant world-wide δ11B value of + 39.5‰. In this paper, available δ11B data of a variety of natural fluid and solid samples from different geological environments are compiled and some of the most relevant aspects, including possible tracer applications of boron-isotope geochemistry, are summarized.
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