Abstract
This paper discusses the results of examining solid geyserite specimens from two present-day Kamchatkan hydrothermal systems: from geysers of the Academy of Sciences and from the Eastern Thermal Field in the caldera of the Uzon Volcano. These studies were performed using methods of IR spectroscopy, XR spectral analysis, and electron microscopy. Three types of geysers were discriminated: underwater, subaerial, and those that originated under the ground surface. All geyserite varieties consist of amorphous opal, and differences between them are caused by the shape, dimensions, and distribution character of silica aggregates. Most examined geyserites enclose silicified microfossil remnants.
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