| Autor: |
T.D. Bullen, Martin R. Palmer, J.K. Aggarwal, Stefán Arnórsson, Kristin Vala Ragnarsdottir |
| Rok vydání: |
2000 |
| Předmět: |
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| Zdroj: |
Geochimica et Cosmochimica Acta. 64:579-585 |
| ISSN: |
0016-7037 |
| DOI: |
10.1016/s0016-7037(99)00300-2 |
| Popis: |
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 δ11B 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 δ11B 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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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