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GEOREF RECORD

Chemical and mineralogic particularities of meta-evaporitic series of the Niccioleta pyrite deposit, Tuscany, Italy

Roland Dechomets
Particularites chimiques et mineralogiques de la serie meta-evaporitique du gisement de pyrite de Niccioleta, Toscane, Italie
Bulletin de la Societe Geologique de France (1983) 25 (3): 411-419

Abstract

The chemical composition of the meta-evaporitic series of Niccioleta is similar (evaporitic rocks excepted) to that of the common mica schist series. However, the sheet silicates have recorded the evaporitic nature of the sedimentation. Only the schist layers in the anhydrite rocks have relatively high Mg and B contents. Electron microprobe analysis proved that muscovites are more phengitic and more magnesian in the evaporitic rocks than in the schists. Small amounts of Mg-bearing chlorites and phlogopites are associated with the phengites (which contain micro-inclusions of tourmaline, rich in dravite). The sedimentary origin of the magnesian character is discussed, the magnesian aggradations of illites are the main factor; typical minerals of evaporite-bearing sediments, like smectites and corrensites do not appear in large quantities. The P-T conditions of regional metamorphism are postulated as 2-3 kbar and 400-450 degrees C.


ISSN: 0037-9409
EISSN: 1777-5817
Coden: BSGFAE
Serial Title: Bulletin de la Societe Geologique de France
Serial Volume: 25
Serial Issue: 3
Title: Particularites chimiques et mineralogiques de la serie meta-evaporitique du gisement de pyrite de Niccioleta, Toscane, Italie
Translated Title: Chemical and mineralogic particularities of meta-evaporitic series of the Niccioleta pyrite deposit, Tuscany, Italy
Author(s): Dechomets, Roland
Affiliation: E.N.S. mines Saint-Etienne, Saint-Etienne 45023, France
Pages: 411-419
Published: 1983
Text Language: French
Publisher: Societe Geologique de France, Paris, France
References: 1 p.
Accession Number: 1985-079190
Categories: Economic geology, geology of ore depositsIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 anal., 2 tables
N42°19'60" - N44°19'60", E09°40'00" - E12°25'00"
Country of Publication: France
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom. Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique, Vandoeuvre-les-Nancy, France
Update Code: 1985
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