X-RAY CHARACTERISATION OF SILICEOUS SINTER FROM STEAMBOAT SPRINGS AND ROOSEVELT GEOTHERMAL FIELDS, USA

Abstract

A combination of different X-ray techniques was used to achieve a comprehensive understanding on siliceous sinters (hot spring rocks) from Steamboat Springs, Nevada, USA, and Roosevelt, Utah, USA. The iTRAX Core Scanner was used to provide in-position geochemical information both qualitatively and quantitatively. By using elemental correlation analysis with the iTRAX results, it was possible to identify mineral phases, examine the various elements and assess their effect on the sinter mineralogy. X-ray diffraction (XRD) was used to examine mineralogy and crystallinity of the siliceous sinters. The information obtained from iTRAX analysis extended and reinforced the XRD results, as XRD is best suited to identify and quantify the mineralogy of crystalline compounds. Further, Wavelength Dispersive X-ray Fluorescence (WD-XRF) was used for the precise elemental analysis. The methodology of combining multiple X-ray techniques provides meaningful information in solving environmental puzzles such as fluid chemistry and the development of complex sinter mineralogy, common in geothermal systems around the world.