Abstract
Potassium-fluor-richterite is reported from wollastonite-rimmed metachert bands embedded in marbles of the Bufa del Diente aureole, NE-Mexico. K-F-richterites were generated via reaction of previously formed contact-metamorphic diopside with infiltrated hypersaline brines of magmatic origin that used the metachert bands as metamorphic aquifers. Their formation occurred at peak metamorphic conditions of 500 to 600 °C at 1 kbar according to the generalised reaction 10 CaMgSi2O6 + 8 SiO2 + 2 KClaq + 6 NaClaaq + 4 H2O + 4 HF diopside + quartz = 2 KNaCaMg5Si8O22(F)2 + 4 Ca2NaH(SiO3)3 + 8 HClaq K-F-richterite + pectolite Compositional ranges in two samples are K-Ri58−69Ri16−25Tri12−21 and K-Ri58−66Ri32−40Tr0−5. Mg/(Mg + Fe2+) ranges from 0.81 to 0.95, F/(F + OH) from 0.55 to 0.85, and the K-F-richterites are Cl-free.
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