摘要
Ｂ在岩浆作用中对于主要造岩矿物的不相容性和水溶液中的较大溶解度使其在地壳（１０×ｌ０（－６））和海洋（４．５×ｌ０（－６））中大量富集。在自然界中Ｂ的同位素组成变化很大（δ（１１）Ｂ＝－３２‰─＋５８‰），但在不同类型地质体中却有较特定的分布范围。造成自然界Ｂ的同位素分馏的主要原因在于流体─固体反应体系的ｐＨ条件和水／岩比值变化。Ｂ的这些特殊地球化学性质在不同地质地球化学作用示踪，特别是与流体有关的地球化学过程的研究中得到了广泛的应用。
This paper gives a thorough review of geochemical studies on boron isotope systems in natural materials, with an emphasis on boron isotope geochemistry of fluid-rock interaction systems. Boron is largely enriched in the crust (10× 10(-6)) and ocean (4.5× 10(-6)), because of its high incompatibility of most major rock-forming minerals and solubility in aqueous solution. The boron isotopic compositions show a big variation, ranging from δ(11)B=-32‰to +58‰, but form a narrow cluster of values for specific rock types. Boron isotopic fractionation mostly results from the pH and water / rock ratio change in the fluid-rock interaction system. The special geochemical featurs of B have been applied to tracing the geochemical processes, expecially those involving fluid-rock interaction.
出处
《地球化学》
CAS
CSCD
北大核心
1996年第1期93-100,共8页
Geochimica
关键词
流体
岩石
水岩反应
硼同位素
地球化学
B isotope
water-rock interaction
palaeoacidity indicator
