Abstract
Cummingtonite occurs in the marginal rind of the Val Biandino intrusion (Orobic Alps, Como, Italy), both as the only amphibole phase in association with pyroxene, and as linked to calcian amphiboles of different types. Crystalchemical data point out the relationship of cummingtonite with the early stage of intrusion of the Val Biandino masses.
Riassunto
Viene segnalata la presenza di cummingtonite sia come unico anfibolo, associato talora a pirosseni, sia concresciuta con Ca-anfiboli in zone marginali, prevalentemente gabbrodioritiche, delle plutoniti della Val Biandino. Ľinterpretazione dei dati cristallochimici ha permesso di chiarire il significato di questo minerale in relazione alle ipotesi di messa in posto ed evoluzione delle plutoniti stesse.
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Bibliografia
Boriani A., 1965.Ľanfibolite a orneblenda e cummingtonite di Ornavasso (Val ľOssola). Rend. Soc. Min. It., 21: 25–34.
Callegari E., 1966.Osservazioni su alcune cummingtoniti del massiccio delľAdamello. Mem. Acc. Pat. SS. LL. AA., cl. Se. Mat. e Nat., 78: 273–310.
Colby J. W., 1971.Magic IV, a computer program for quantitative electron microprobe analysis. Bell Telephone Laboratories, Allentown, Pennsylvania.
D’Arco Ph., Maury R. C. andWestercamp D., 1981.Geothermometry and geobarometry of a cummingtonite-bearing dacite from Martinique, lesser Antilles. Contrib. Mineral. Petrol., 77: 177–184.
De Capitani L., 1982.Contributo alla conoscenza dei plutoni sudalpini: le masse intrusive della Val Biandino (Como). Rend. Soc. It. Min. Petr., 38: 109–118.
De Capitani L., Delitala M. C., Liborio G., Mottana A., Nicoletti M. andPetrucciani C., 1988.K-Ar dating of the Val Biandino plutonic complex (Orobic Alps, Italy). Mem. Se. Geol., 40: 285–294.
De Capitani L. andLiborio G., 1988.Trace element abundance in the Val Biandino pluton (Southern Alps, Italy). Mem. Sc. Geol., 40: 99–110.
Fabriès J., Conquere F. andArnaud G., 1984.The mafic silicates in the Saint Quay-Portrieux gabbro-diorite intrusion: crystallization conditions of a calc-alkaline pluton. Bull. Minéral., 107: 715–736.
Hoinkes G. andMogessee A., 1986.Coexisting cummingtonite and calcic amphibole in amphibolites from the Schneeberg complex, Tyrol, Austria. TMPM Tschermaks Min. Petr. Mitt., 35: 33–45.
Klein C. {jrJr.}, 1968.Coexisting amphiboles. J. Petrol, 9: 281–330.
Leake B. E., 1978.Nomenclature of amphiboles. Min. Mag., 42: 533–563.
Pedersen A. K. andHald N., 1982.A cummingtonite-porphyritic dacite with amphibole-rich xenoliths from the Tertiary central volcano at Kroksfjordur, NW Iceland. Lithos, 15: 137–159.
Petrakakis K. andDietrich H., 1985.MINSORT: A program for the processing and archivation of microprobe analyses of silicate and oxide minerals. N. Jb. Miner. Mh., 8: 379–384.
Ross M., Papike J. J. andShaw K. W., 1969.Exolution textures in amphiboles as indicators of subsolidus thermal histories. Mineral. Soc. Amer. Spec. Pap., 2: 275–299.
Seitsaari J., 1952.On association of cummingtonite and horneblende. Ann. Acad. Sc. Fennicae, s.A, III, 30: 1–20.
Shido F., 1958.Plutonic and metamorphic rocks of the Nakoso and Iritono districts in the Central Abukuma Plateau. Journ. Fac. Sc. Univ. Tokyo, s. II, 11: 1–131.
Yaimaguchi Y., 1985.Hornblende-cummingtonite and hornblende-actinolite intergrowths from the Koyama calc-alkaline intrusion, Susa, southwest Japan. Am. Mineral., 70: 980–986.
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Nella seduta del 12 maggio 1990.
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Capitani, L.D., Liborio, G. & Schiavinato, G. Cummingtonite nelle plutoni ti della Val Blandino (Como). Rend. Fis. Acc. Lincei 1, 379–385 (1990). https://doi.org/10.1007/BF03001772
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DOI: https://doi.org/10.1007/BF03001772