Hydrothermal mineralization in the Iceland rift zone (Tectonic control of the formation of mineral concentrations) |
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| Authors: | A R Geptner |
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| Institution: | (1) Geological Institute, Russian Academy of Sciences, Pyzhevskii per. 7, Moscow, 119017, Russia |
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| Abstract: | Distribution, timing, and sequence of hydrothermal mineralization in the Iceland rift zone are discussed. Vein and pore mineralization in basalts confined to the fissure-dike swarm is considered. Intermittent formation of siliceous and other hydrothermal minerals is established at a sufficiently prolonged existence of hydrothermal system. Formation of parallel-layered smectite-zeolite segregations in the course of extension and origination of open fissures and groundwater level fluctuations is analyzed. Local concentration of silica in the plateau basalt-hosted fissures and cavities, as well as accumulation of banded siliceous segregations (onyxes), is ascribed to the multiple intermittent inputs of solutions into the basalt mineralization zone. |
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