X-ray absorption spectra-in the Fe K near-edge.region (XANES) and 57Fe Mossbauer spectra were collected on two Fe-rich pumpellyite specimens from low-grade metarnorphosed spilitic rocks from the Keweenaw Peninsula, northern Michigan, and on prehnite and epidote coexisting with pumpellyite, Spectroscopic data for prehnite, presented for the first rime, are discussed in Iight of the pseudosymmetry of its structure, The data clearly show the prevailing role of Fe3+ in the crystal chemìstry of the paragenetically assooiated Ca-silicates, This 1Sin agreement with the overall oxidizing conditions typical of the low-grade metamorphic environment and the mìneralassemblages characteristic of alterationzones i.n basaltic rocks as described by petrological analyses.
Spectroscopic studies of coexisting prehnite-pumpellyite and epidote-pumpellyite
ARTIOLI, GILBERTO;
1995
Abstract
X-ray absorption spectra-in the Fe K near-edge.region (XANES) and 57Fe Mossbauer spectra were collected on two Fe-rich pumpellyite specimens from low-grade metarnorphosed spilitic rocks from the Keweenaw Peninsula, northern Michigan, and on prehnite and epidote coexisting with pumpellyite, Spectroscopic data for prehnite, presented for the first rime, are discussed in Iight of the pseudosymmetry of its structure, The data clearly show the prevailing role of Fe3+ in the crystal chemìstry of the paragenetically assooiated Ca-silicates, This 1Sin agreement with the overall oxidizing conditions typical of the low-grade metamorphic environment and the mìneralassemblages characteristic of alterationzones i.n basaltic rocks as described by petrological analyses.Pubblicazioni consigliate
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