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GEOREF RECORD

Iron-bearing chlor-fluorapatites in crustal xenoliths from the Stromboli Volcano (Aeolian Islands, southern Italy); an indicator of fluid processes during contact metamorphism

Daniel Harlov, Alberto Renzulli and Filippo Ridolfi
Iron-bearing chlor-fluorapatites in crustal xenoliths from the Stromboli Volcano (Aeolian Islands, southern Italy); an indicator of fluid processes during contact metamorphism
European Journal of Mineralogy (April 2006) 18 (2): 233-241

Abstract

Chlor-fluorapatite crystals unusually rich in Fe (up to 4.88 wt %; 0.715 pfu) have been found in cordierite- and feldspar-bearing hornfels metapelitic xenoliths in calc-alkaline basaltic andesite lavas from Stromboli. These xenoliths originated in a mid-crustal (200-350 MPa) contact aureole (800 degrees C) surrounding the magmatic plumbing system of the volcano. The high and somewhat variable Cl, Fe, Na and Mn contents in the apatite are interpreted as CaCl (sub 2) , FeCl (sub 2) , FeCl (sub 3) , NaCl and MnCl (sub 2) hydrous chloride melts present in the calc-alkaline basaltic andesite magma responsible for the metamorphism of the metapelites to hornfels facies in the contact aureole. During the partial melting and dehydration of the metapelites, H (sub 2) O was partitioned strongly into the partial melt and then into the magma. This H (sub 2) O-rich partial melt was partly replaced by hydrous chloride melts, which metasomatized the original fluorapatite to chlor-fluorapatite with variable Cl, Fe, Na and Mn. This scenario is supported by the patchy enrichment of Cl, Fe, Na and Mn in the chlor-fluorapatite grains and the correspondingly low water activities present during formatiion of the hornfels, as confirmed by the lack of hydrous phases in the modal mineralogy of the xenoliths.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 18
Serial Issue: 2
Title: Iron-bearing chlor-fluorapatites in crustal xenoliths from the Stromboli Volcano (Aeolian Islands, southern Italy); an indicator of fluid processes during contact metamorphism
Affiliation: GeoForschungsZentrum Potsdam, Potsdam, Federal Republic of Germany
Pages: 233-241
Published: 200604
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 59
Accession Number: 2006-047601
Categories: Mineralogy of non-silicatesIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. table
N38°47'60" - N38°47'60", E15°15'00" - E15°15'00"
Secondary Affiliation: Universita degli Studi di Urbino "Carlo Bo", ITA, Italy
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200626
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