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Phlogopite from the Ventaruolo subsynthem volcanics (Mt Vulture, Italy): a multi-method study

Published online by Cambridge University Press:  05 July 2018

E. Schingaro ,
F. Scordari ,
S. Matarrese ,
E. Mesto ,
F. Stoppa ,
G. Rosatelli  and
G. Pedrazzi
E. Schingaro
Affiliation:
Dipartimento Geomineralogico, Università degli Studi di Bari, Via E. Orabona 4, I-70125 Bari, Italy
F. Scordari*
Affiliation:
Dipartimento Geomineralogico, Università degli Studi di Bari, Via E. Orabona 4, I-70125 Bari, Italy
S. Matarrese
Affiliation:
Dipartimento Geomineralogico, Università degli Studi di Bari, Via E. Orabona 4, I-70125 Bari, Italy
E. Mesto
Affiliation:
Dipartimento Geomineralogico, Università degli Studi di Bari, Via E. Orabona 4, I-70125 Bari, Italy
F. Stoppa
Affiliation:
Dipartimentodi Scienze della Terra, Università G. d’Annunzio, Via dei Vestini 3, I-66013 Chieti Scalo, Italy
G. Rosatelli
Affiliation:
Dipartimentodi Scienze della Terra, Università G. d’Annunzio, Via dei Vestini 3, I-66013 Chieti Scalo, Italy
G. Pedrazzi
Affiliation:
Dipartimento di Sanita’ Pubblica, Sezione di Fisica e CNISM, Plesso Biotecnologico Integrato, via Volturno 39, I-43100 Parma, Italy
*
E-mail: [email protected]
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Abstract

Volcanic activity at Mt Vulture lasted throughout the Middle Pleistocene and produced SiO2- undersaturated volcanics. Deposits from the Monte Vulture stratovolcano have been classified into four subsynthems and clustered into the Barile Synthem. In the present investigation, trioctahedral micas from the uppermost units (the Ventaruolo Subsynthem) of the Barile Synthem are considered. The samples are labelled VUT187. The phlogopitic micas were separated from the host rock (an olivinefoidite) and underwent chemical (electron microprobe analysis - EMPA and C-H-N), structural (singlecrystal X-ray diffraction) and spectroscopic (Mössbauer) investigations.

The EMPA yielded: MgO (17.62–21.89 wt.%), FeOtot (5.98–9.78 wt.%), TiO2 (1.81–3.92 wt.%) and Al2O3 (14.47–17.98 wt.%), with H2O contents = 2.86 (±0.42) wt.% determined by C-H-N analyses. Mössbauer investigation provided [VI]Fe2+ = 12.6%, [VI]Fe3+ = 87.4%. The chemical and structural data are consistent with the occurrence of Ti-oxy, [VI]M2+ + 2(OH)– ⇋ [VI]Ti4+ + 2O2– + H2, and M3+-oxy substitutions, [VI]M2+ + (OH)– ⇋ [VI]M3+ + O2– + 1/2H2, with M3+ = Fe3+, Al3+. In particular, Fe3+-oxy substitution has affected the Fe2+/Fe3+ ratioin the studied sample. This is probably due to the fact that interaction with underground water or a hydrothermal system may have altered the oxygen fugacity and raised the Fe3+ content of VUT187 phlogopite with respect to magmatic values.

Keywords

volcanic phlogopiteMössbauer spectroscopystructure refinementC-H-N elemental analysiscrystal chemistrysubstitution mechanisms
Type
Research Article
Information
Mineralogical Magazine , Volume 71 , Issue 5 , October 2007 , pp. 519 - 537
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2007

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