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GEOREF RECORD

The Hercynian volcano-plutonic association of Ganna (Lake Lugano, central Southern Alps, Italy)

F. Bakos, A. Del Moro and D. Visona
The Hercynian volcano-plutonic association of Ganna (Lake Lugano, central Southern Alps, Italy)
European Journal of Mineralogy (June 1990) 2 (3): 373-383

Abstract

A late Permian caldera structure has been identified in the area immediately SSW of Lake Lugano. A lower thick sequence of andesites, dacites and rhyolites is intruded by the top of a leucogranitic pluton, also Permian in age. Magmatic activity ended with a short rhyolitic episode. Although the volcanic sequence is lithologically expanded and shows a marked calc-alkaline character, the pluton is composed mainly of leucogranitic differentiates linked by FC processes. A Rb/Sr whole-rock isochron dates the intrusion to 275 + or - 8 Ma (MSWD = 0.11) ; the initial Sr isotope ratio (0.7089 + or - 0.0034) and the occurrence of fayalite in some rock-types suggests that magma production involved mantle-derived materials.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 2
Serial Issue: 3
Title: The Hercynian volcano-plutonic association of Ganna (Lake Lugano, central Southern Alps, Italy)
Affiliation: Agip Miniere, I-Milan, Italy
Pages: 373-383
Published: 199006
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 31
Accession Number: 1993-008901
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 15 anals., sect., 3 tables, geol. sketch map
N44°40'00" - N46°40'00", E08°30'00" - E11°25'00"
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe, Hanover, Germany
Update Code: 1993
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