Geochemistry of rare-earth elements in thermal waters of Uzon-Geyzernaya hydrothermal system (Kamchatka) |
| |
| Authors: | GA Karpov PA Schroeder AG Nikolaeva |
| |
| Institution: | 1. Institute of Volcanology and Seismology, Far Eastern Branch of the Russian Academy of Sciences, Piipa bul’v. 9, Petropavlovsk-Kamchatsky, 683006, Russia;2. University of Georgia, Department of Geology, Athens, GA 30602-2501, USA |
| |
| Abstract: | Precisional analyses of the abundances of La, Ce, and major elements in thermal waters and rocks of the Uzon-Geyzernaya volcanotectonic depression, supplemented by published data on a number of modern high-temperature hydrothermal systems of Kamchatka and two other areas of the world, allowed defining genetically important patterns of rare-earth elements (REE) distribution. The La and Ce abundances positively correlate with silica contents both in fresh igneous rocks of the study areas and in the products formed by hydrothermal processes.All studied hydrothermal clays are enriched in La and Ce. The general enrichment trend is similar to the pattern of positive correlation between the La and Ce abundances. Geothermal waters display a strong relationship between REE enrichment and pH. Enhanced REE enrichment trend is observed in thermal waters with abundant SO42 ? and K. The REE versus Cl and B diagrams show two individual fields reflecting the level of acidity-alkalinity of thermal waters. These data demonstrate that La and Ce concentrations in the products of modern hydrothermal systems (in fluids and secondary mineral phases) are governed by wallrock composition, anionic water composition, and pH/Eh-dependent adsorption processes. |
| |
| Keywords: | Uzon Caldera rare-earth elements thermal waters thermal fields hydrothermal clays |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
