B.N. Pritchett, M.E. Elwood Madden
Jarosite is a ferric sulfate salt ((K, H, Na)Fe3(SO4)2(OH)6) that forms in acidic, oxidizing environments on Earth and has also been observed in outcrops on Mars. High chloride concentrations within the outcrops at Meridiani Planum suggest that jarosite likely interacted with high salinity brines. This study examines jarosite dissolution in H2O–CaCl2, and H2O–NaCl brines (activity of water,aH2O¼0.35 and 0.75 respectively) to determine the effects of high salinity brines and aH2O on jarosite dissolution rates. Within brines with aH2O¼0.75 and 0.35, initial K-jarosite dissolution rates at 298 K decrease from log r¼/C0 9.9 to /C0 11.6 mol m/C0 2 s/C0 1, and Na-jarosite rates decrease from log r¼/C0 10.6 to /C0 11.2 mol m/C0 2 s/C0 1, respectively. In addition, K-jarosite dissolution in NaCl brine at 263 K yielded an average dissolution rate of logr¼/C0 11.6 mol m/C0 2 s/C0 1. Applying a shrinking sphere model to determine 1 mm jarosite particle lifetimes extends the maximum duration of fluid alteration from lifetimes of o500 years calculated for dilute solutions up to 30,000þ years in cold, high salinity conditions.
@article{5162e19b-3ee4-487c-a6e8-6bdc4108f59d,
title={Jarosite dissolution rates and maximum l},
author={B.N. Pritchett and M.E. Elwood Madden},
year={2026},
language={en}
}TY - JOUR TI - Jarosite dissolution rates and maximum l AU - B.N. Pritchett AU - M.E. Elwood Madden PY - 2026 LA - en ER -
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