American Mineralogist · 2003 · 23 citations · 14 references
Natural SciencesEarth SciencesGeologyElemental AnalysisGeochemistryMineralogyMagma GenesisMineral AlterationMineral GenesisMineral TransformationSilicate MineralsSkarn DepositsAlteration MineralogyMetamorphic Mineral ReactionsMineral InclusionsMineral Reaction PathwaysQuartzRaman ScatteringRetrograde AlterationRetrograde Reactions
Evidence is presented for retrograde reaction of silicate minerals with saline brine inside fluid inclusions during post-entrapment cooling. Ferropyrosmalite [(Fe,Mn)8Si6O15(OH,Cl)10, where Fe>>Mn] has previously been interpreted as a daughter mineral in saline inclusions in magmatic quartz from altered granodiorite associated with the Vyhne-Klokoč Fe-skarn deposit of Slovakia. Based on combined Raman spectroscopic, microthermometric, and SEM-EDX techniques this phase is shown to react, on heating above 450 °C with a Ca-enriched saline inclusion fluid, to form clinopyroxene. This suggests that clinopyroxene was originally present in the inclusions at high temperature, and then underwent retrograde reaction with the saline fluid, on cooling, to form ferropyrosmalite. In its simplest form, the equilibrium reaction for this transformation is:
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Raman microspectrometry of fluid inclusions
E. A. J. Burke · Lithos · 2001 · 564 citations
Ferenc Molnár, David H. Watkinson, Peter C. Jones · Economic Geology · 2001 · 88 citations