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Fluorophlogopite-bearing and carbonate metamorphosed xenoliths from theCampanian Ignimbrite (Fiano, southern Italy): crystal chemical, geochemical and volcanological insights

Published online by Cambridge University Press:  02 January 2018

M. Lacalamita ,
G. Balassone ,
E. Schingaro ,
E. Mesto ,
A. Mormone ,
M. Piochi ,
G. Ventruti  and
M. Joachimski
M. Lacalamita
Affiliation:
Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari Aldo Moro, via Orabona 4, I-70125 Bari, Italy
G. Balassone
Affiliation:
Dipartimento di Scienze della Terra dell’Ambiente e delle Risorse, Università “Federico II”, Complesso Universitario Monte S. Angelo, Via Cinthia, I-80126 Napoli, Italy
E. Schingaro*
Affiliation:
Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari Aldo Moro, via Orabona 4, I-70125 Bari, Italy
E. Mesto
Affiliation:
Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari Aldo Moro, via Orabona 4, I-70125 Bari, Italy
A. Mormone
Affiliation:
Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuviano, via Diocleziano 328, I-80124 Napoli, Italy
M. Piochi
Affiliation:
Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuviano, via Diocleziano 328, I-80124 Napoli, Italy
G. Ventruti
Affiliation:
Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari Aldo Moro, via Orabona 4, I-70125 Bari, Italy
M. Joachimski
Affiliation:
GeoZentrum Nordbayern, Universität Erlangen-Nürnberg, Erlangen 91054, Germany
*
*E-mail: [email protected]
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Abstract

Fluorine-, boron- and magnesium-rich metamorphosed xenoliths occur in the Campanian Ignimbrite deposits at Fiano (southern Italy), at ∼50 km northeast of the sourced volcanic area. These rocks originated from Mesozoic limestones of the Campanian Apennines, embedded in a fluid flow. The Fiano xenoliths studied consist of ten fluorophlogopite-bearing calc-silicate rocks and five carbonate xenoliths, characterized by combining mineralogical analyses with whole-rock and stable isotope data. The micaceous xenoliths are composed of abundant idiomorphic fluorophlogopite, widespread fluorite, F-rich chondrodite, fluoborite, diopside, Fe(Mg)-oxides, calcite, humite, K-bearing fluoro-richterite and grossular. Of the five mica-free xenoliths, two are calcite marbles, containing subordinate fluorite and hematite, and three are weakly metamorphosed carbonates, composed only of calcite. The crystal structure and composition of fluorophlogopite approach that of the end-member. The Fiano xenoliths are enriched in trace elements with respect to the primary limestones. Comparisons between the rare-earth element (REE) patterns of the Fiano xenoliths and those of both Campanian Ignimbrite and Somma-Vesuvius marble and carbonate xenoliths showthat the Fiano pattern overlaps that of Somma-Vesuvius marble and carbonate xenoliths, and reproduces the trend of Campanian Ignimbrite rocks. Values of δ13C and δ18O depict the same trend of depletion in the heavy isotopes observed in the Somma-Vesuvius nodules, and is related to thermometamorphism. Trace-element distribution, paragenesis, stable isotope geochemistry and data modelling point to infiltration of steam enriched in F, B,Mg and As into carbonate rocks at a temperature of ∼300–450°C during the emplacement of the Campanian Ignimbrite.

Keywords

Fiano xenolithsCampanian IgnimbriteSouthern Italyfluorophlogopitecrystal chemistrygeochemistry
Type
Research Article
Information
Mineralogical Magazine , Volume 81 , Issue 5 , October 2017 , pp. 1165 - 1189
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2017

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