caa a22 4500 469056819 CHVBK 20180323132846.0 cr unu---uuuuu 170328e19920301xx s 000 0 ita 10.1007/BF03002963 doi (NATIONALLICENCE)springer-10.1007/BF03002963 Sulla vanabilità compositiva delle miche nell'amhito di uno stesso affioramento di metapeliti di basso grado: un esempio. 2: Le muscoviti e considerazioni conclusive [Elektronische Daten] [Luca Peruzzo, Raffaele Sassi, F. Sassi] Compositional variability of micas within the same outcrop of low-grade metapelites: a case-study. 2: The muscovites, and concluding remarks The present paper reports and discusses the results on compositional variability of muscovites, obtained in the frame of a research project on the chemistry of biotites and muscovites in low-grade metapelites. The results on biotites have been reported in a separate paper, to which readers are deferred also because it gives the statement of the problem, the strategy of research and the analytical procedures. Muscovite flakes from granoblastic domains are substantially identical to those from lepidoblastic domains, as well as muscovite flakes located in the hinges of microfolds in comparison with those in the limbs. On the contrary, muscovite flakes crystallized during Cr2 compositionally differ from those crystallized during Cr3, in the latter case, muscovite and biotite chemistries suggest slightly higher temperatures although the mineral compatibilities are unchanged. The analytical results indicate a similar behaviour for muscovites and biotites. In particular, within rock samples in which Cr3 effects are widespread, the chemistries of Cr2 muscovites and biotites turn out to be changed. This fact, as well as some chemical peculiarities of the mica flakes depending on the different mineral phases in contact, indicates that use of geothermobarometry in low-grade metapelites requires caution: microtexturally identical mica flakes may give differentT,P values depending on their size, the adjacent mineral phase, and the extent of chemical re-equilibration during the thermal climax. Accademia nazionale dei Lincei, 1992 Muscovite nationallicence Biotite nationallicence Mineral chemistry nationallicence Geothermometry nationallicence Metapelites nationallicence Peruzzo Luca Dipartimento di Mineralogia e Petrologia, Università degli Studi di Padova, Corso Garibaldi, 37 - 35122, Padova aut Sassi Raffaele Dipartimento di Mineralogia e Petrologia, Università degli Studi di Padova, Corso Garibaldi, 37 - 35122, Padova aut Sassi F. Dipartimento di Mineralogia e Petrologia, Università degli Studi di Padova, Corso Garibaldi, 37 - 35122, Padova aut Rendiconti Lincei Springer-Verlag 3/1(1992-03-01), 43-55 1120-6349 3:1<43 1992 3 12210 https://doi.org/10.1007/BF03002963 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF03002963 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Peruzzo Luca Dipartimento di Mineralogia e Petrologia, Università degli Studi di Padova, Corso Garibaldi, 37 - 35122, Padova aut NATIONALLICENCE 700 1- Sassi Raffaele Dipartimento di Mineralogia e Petrologia, Università degli Studi di Padova, Corso Garibaldi, 37 - 35122, Padova aut NATIONALLICENCE 700 1- Sassi F. Dipartimento di Mineralogia e Petrologia, Università degli Studi di Padova, Corso Garibaldi, 37 - 35122, Padova aut NATIONALLICENCE 773 0- Rendiconti Lincei Springer-Verlag 3/1(1992-03-01), 43-55 1120-6349 3:1<43 1992 3 12210 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer