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Investigating Low-t emperature Hydrothermal Alteration in Drill cuttings From Pilgrim Hot springs, Alaska, Using a suite of Low cost Analytical techniques

Reflectance spectroscopic, methylene blue, and X-ray diffraction (XRD) analyses have been applied to ~400 m of drill cuttings and core from an exploration well at Pilgrim Hot Springs, Alaska with the aim of rapidly characterizing the extent and style of lowtemperature hydrothermal alteration as well as determining paths of geothermal fluid-flow. Sample reflectance spectra indicate a mineral assemblage comprised predominantly of montmorillonite, illite, chlorite, and kaolinite with depth-related variations in mineral assemblages, specifically in core section, related to changing alteration intensity. The observations from reflectance spectroscopy show good agreement with the results of methylene blue analyses concerning the distribution of smectite within the cuttings and core samples. The results of XRD for a limited set of the drill cuttings show reasonable agreement with the outcomes of reflectance spectroscopy and methylene blue analyses. The results of this study reveal a history of hydrothermal activity at Pilgrim Hot Springs characterized as argillic alteration. This points to a possible temperature- and chemical-regime elevated above current conditions. The combination of these low-cost techniques can be applied to various geothermal systems as a means of investigating the degree of alteration in sediments and bedrock to determine past hydrothermal fluid migration pathways.