Aspetti genetici del batolite sardo-corso  [Genetic aspects of the Sardinian-Corsican batholith]

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Alternate Title:Genetic aspects of the Sardinian-Corsican batholith
Authors:Bralia, A.; Ghezzo, C.; Guasparri, G.; Sabatini, G.
Author Affiliations:Primary:
Univ. Siena, Ist. Mineral. Petrogr., Siena 53100, Italy
Volume Title:Atti del Congresso della Societa Italiana di Mineralogia e Petrologia
Source:Rendiconti della Società Italiana di Mineralogia e Petrologia, 38(2), p.701-764; Societa Italiana di Mineralogia e Petrologia; Congresso, Abano, Padua, Italy, June 3-4, 1982. Publisher: Editrice Succ. Fusi., Pavia, Italy. ISSN: 0037-8828
Publication Date:1982
Note:In Italian with English summary. 4 p. refs. Geol. map 1:10,000; illus. incl. 230 anal., 4 tables, 1 plate, geol. sketch maps, portrs.
Summary:The complex sequence of intrusive events which led to the formation of the Sardinian batholith can be related to two main phases; the first took place in a late syntectonic regime with production and emplacement of gabbro-tonalite to monzogranitic rocks; the second, clearly post-tectonic, yielded solely crustal minimum-melt products (leucogranites). First-phase plutonites all contain basic magma-derived microgranular (BMD) inclusions which field and petrographic evidence indicate strongly as having derived from the same basic magmas as the small gabbro-dioritic masses scattered in the batholith. Study of the inclusions, gabbroic masses and their border facies suggests that the BMD inclusions originate from sub-crustal magmas. Commingling and hybridization, producing BMD inclusions and hybrid rocks, respectively, are the two different but contemporaneous phenomena of the same mixing process which took place between crustal and sub-crustal magmas with a viscosity difference sufficient to prevent complete homogenization; the process probably started in the anatexis zone. Evaluation of xenocrystal contents, performed on granodioritic and tonalitic rocks, suggests that hybridization was quantitatively much more important than commingling. Chemical analyses of >250 located samples are given. [J.M.H.]
Subjects:Batholiths; Diorites; Electron probe; Emplacement; Gabbros; Granites; Hybridization; Igneous rocks; Intrusions; Leucogranite; Magmas; Major elements; Minor elements; Petrology; Phase equilibria; Plutonic rocks; Structural geology; Tonalite; Variscan Orogeny; Corsica; Europe; France; Italy; Sardinia Italy; Southern Europe; Western Europe; Igneous activity; Punta Falcone; Sardo-Corsican Batholith; Geologic map
Abstract Numbers:85M/3351
Record ID:1986045425
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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