Mineralogia e geochimica della pegmatite del granito di Predazzo; II, I feldspati  [Mineralogy and geochemistry of pegmatite from the Predazzo Granite; II, Feldspars]

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Alternate Title:Mineralogy and geochemistry of pegmatite from the Predazzo Granite; II, Feldspars
Authors:Lucchini, F.; Morandi, N.; Nannetti, M. C.; Pirani, R.; Resmi, U.
Author Affiliations:Primary:
Univ., Ist. Mineral. Petrogr., Bologna 40127, Italy
Corporate Authors:Italy, Societa Italiana di Mineralogia e Petrologia, Milan 20121
Volume Title:Congresso di Cagliari
Source:Rendiconti della Società Italiana di Mineralogia e Petrologia, 38(1), p.469-482; Societa Italiana di Mineralogia e Petrologia; Congresso, Cagliari, Italy, Oct. 14-16, 1981, Italy, Societa Italiana di Mineralogia e Petrologia, Milan 20121. Publisher: Editrice Succ. Fusi., Pavia, Italy. ISSN: 0037-8828
Publication Date:1982
Note:In Italian with English summary. 2 p. refs.; illus. incl. 35 anal., 10 tables
Summary:The mineralogy, chemistry and structural state of 31 perthites and four plagioclase samples from aplitic and pegmatitic dykes, veins and geodes in the Predazzo granite are described, using chemical (AAS, XRF and microprobe), optical and X-ray analyses. The feldspars occurring in dykes crossing the albite granite and the uneven-grained biotite granite (zone a) show bulk compositions (Or 65%), structural state (higher obliquity) and trace geochemistry (especially Rb contents and K/Rb ratios) consistent with a marked differentiation. The feldspars collected in the south area (b and c zones) are less differentiated and are more affected by complex metasomatic activities, marked by lowering of Rb, by anomalous correlations among some major and trace elements, and by wider scattering in the bulk compositions and structural states. In addition, good correlations between the colour (darker) of the feldspars, their obliquity (higher) and chemical compositions (mobilization of K, Na, Rb and perhaps Ba) seem to be indicative of higher metasomatic activity. [J.M.H.]
Subjects:Alkali feldspar; Anorthoclase; Economic geology; Electron probe data; Feldspar group; Framework silicates; Geochemistry; Granites; Hydrothermal alteration; Igneous rocks; K-feldspar; Major elements; Metasomatism; Pegmatite; Perthite; Petrology; Plutonic rocks; Silicates; Trace elements; X-ray data; Europe; Italy; Predazzo Italy; Southern Europe; Trentino-Alto Adige Italy
Coordinates:N461800 N461800 E0113500 E0113500
Abstract Numbers:85M/1861
Record ID:1985058845
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique
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041 |a ita  |b eng 
072 7 |a 05A  |2 georeft 
100 1 |a Lucchini, F.  |e analytic author  |u Univ., Ist. Mineral. Petrogr., Bologna 40127 
242 0 0 |a Mineralogy and geochemistry of pegmatite from the Predazzo Granite; II, Feldspars 
245 1 0 |a Mineralogia e geochimica della pegmatite del granito di Predazzo; II, I feldspati 
300 |a p. 469-482 
500 |a In Italian with English summary. 2 p. refs. 
500 |a Abstract number: 85M/1861 
500 |a Abstractor: J.M.H. 
500 |a Affiliation: Univ., Ist. Mineral. Petrogr.; Bologna 40127; ITA; Italy 
500 |a Key title: Rendiconti della Società Italiana di Mineralogia e Petrologia 
500 |a Source note: Rendiconti della Società Italiana di Mineralogia e Petrologia, 38(1), p.469-482; Societa Italiana di Mineralogia e Petrologia; Congresso, Cagliari, Italy, Oct. 14-16, 1981, Italy, Societa Italiana di Mineralogia e Petrologia, Milan 20121. Publisher: Editrice Succ. Fusi., Pavia, Italy. ISSN: 0037-8828 
500 |a Publication type: conference paper or compendium article 
504 |b 2 p. refs. 
510 3 |a GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique 
520 |a The mineralogy, chemistry and structural state of 31 perthites and four plagioclase samples from aplitic and pegmatitic dykes, veins and geodes in the Predazzo granite are described, using chemical (AAS, XRF and microprobe), optical and X-ray analyses. The feldspars occurring in dykes crossing the albite granite and the uneven-grained biotite granite (zone a) show bulk compositions (Or 65%), structural state (higher obliquity) and trace geochemistry (especially Rb contents and K/Rb ratios) consistent with a marked differentiation. The feldspars collected in the south area (b and c zones) are less differentiated and are more affected by complex metasomatic activities, marked by lowering of Rb, by anomalous correlations among some major and trace elements, and by wider scattering in the bulk compositions and structural states. In addition, good correlations between the colour (darker) of the feldspars, their obliquity (higher) and chemical compositions (mobilization of K, Na, Rb and perhaps Ba) seem to be indicative of higher metasomatic activity. 
650 7 |a Alkali feldspar  |2 georeft 
650 7 |a Anorthoclase  |2 georeft 
650 7 |a Economic geology  |2 georeft 
650 7 |a Electron probe data  |2 georeft 
650 7 |a Feldspar group  |2 georeft 
650 7 |a Framework silicates  |2 georeft 
650 7 |a Geochemistry  |2 georeft 
650 7 |a Granites  |2 georeft 
650 7 |a Hydrothermal alteration  |2 georeft 
650 7 |a Igneous rocks  |2 georeft 
650 7 |a K-feldspar  |2 georeft 
650 7 |a Major elements  |2 georeft 
650 7 |a Metasomatism  |2 georeft 
650 7 |a Pegmatite  |2 georeft 
650 7 |a Perthite  |2 georeft 
650 7 |a Petrology  |2 georeft 
650 7 |a Plutonic rocks  |2 georeft 
650 7 |a Silicates  |2 georeft 
650 7 |a Trace elements  |2 georeft 
650 7 |a X-ray data  |2 georeft 
651 7 |a Europe  |2 georeft 
651 7 |a Italy  |2 georeft 
651 7 |a Predazzo Italy  |2 georeft 
651 7 |a Southern Europe  |2 georeft 
651 7 |a Trentino-Alto Adige Italy  |2 georeft 
700 1 |a Morandi, N.,  |e analytic author 
700 1 |a Nannetti, M. C.,  |e analytic author 
700 1 |a Pirani, R.,  |e analytic author 
700 1 |a Resmi, U.,  |e analytic author 
710 2 |a Italy, Societa Italiana di Mineralogia e Petrologia, Milan 20121 
711 2 |a Societa Italiana di Mineralogia e Petrologia; Congresso  |d (1981 :  |c Cagliari, Italy)  
773 0 |t Congresso di Cagliari  |d Pavia : Editrice Succ. Fusi., 1982  |k Rendiconti della Società Italiana di Mineralogia e Petrologia  |x 0037-8828  |y SIMPAL  |n Rendiconti della Società Italiana di Mineralogia e Petrologia, 38(1), p.469-482; Societa Italiana di Mineralogia e Petrologia; Congresso, Cagliari, Italy, Oct. 14-16, 1981, Italy, Societa Italiana di Mineralogia e Petrologia, Milan 20121. Publisher: Editrice Succ. Fusi., Pavia, Italy. ISSN: 0037-8828 Publication type: conference paper or compendium article  |g Vol. 38, no. 1  |h illus. incl. 35 anal., 10 tables