The boron isotope systematics of Icelandic geothermal waters: 1. Meteoric water charged systems

Aggarwal, J.K., Palmer, M.R., Bullen, T.D., Arnórsson, S. and Ragnarsdóttir, K.V. (2000) The boron isotope systematics of Icelandic geothermal waters: 1. Meteoric water charged systems. Geochimica et Cosmochimica Acta, 64 (4), 579-585. (doi:10.1016/S0016-7037(99)00300-2).

Abstract

We have measured the boron isotope composition and boron and chloride concentrations of 27 Icelandic geothermal fluids from both high- and low-temperature systems. The ?11B values range from -6.7‰ in the Krafla system, to +25.0‰ in a warm spring from the Southern Lowlands. In addition, we have also determined the ?11B values of basaltic glass from Nesjavellir (-5.3 ± 1.4‰) and travertine from Snaefellsnes (-22 ± 0.5‰). The B isotope and Cl/B systematics of the high-temperature systems are dominated by the composition of the local basalts. The lower temperature systems show evidence for mixing with B and Cl of a marine origin, together with some uptake of B into secondary mineral phases. The data from the Snaefellsnes geothermal system indicate that the fluids have undergone interaction with basalts that have undergone significant low-temperature alteration by seawater.

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