Potassium-fluor-richterite in metacherts from the Bufa del Diente contact-metamorphic auréole, NE-México View Full Text


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Article Info

DATE

1994-12

AUTHORS

W. Heinrich

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. Microthermometrically determined K/(K + Na)-ratios of hypersaline brines trapped at 500°C to 600°C range from 0.50 to 0.64, resulting in distribution coefficients KDK-NaAmph-F1 = XK(in A)Amph/XN(in A)Amph · XNaF1/XKF1 of 0.85 to 1.3 for the Na-K amphibole-fluid exchange reaction. Very low Ca-contents in bulk fluid leachates indicate that Cacontaining fluids cannot coexist with richterite and that Ca is incorporated into amphibole as a tremolite component. Amphibole compositions in Al-free systems can predict Na-K-Ca-ratios of metasomatic brines that equilibrated with them. Despite the hypersaline nature of the brines, Cl is not incorporated into the Mg-rich K-F-richterites because of the Mg-Cl and Fe-F avoidance rules in amphiboles. More... »

PAGES

259-270

References to SciGraph publications

  • 1967-03. The mineralogy and petrology of the volcanic rocks from the Leucite Hills, Wyoming in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • Journal

    TITLE

    Mineralogy and Petrology

    ISSUE

    4

    VOLUME

    50

    Author Affiliations

    Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/bf01164609

    DOI

    http://dx.doi.org/10.1007/bf01164609

    DIMENSIONS

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