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Kirschsteinite in the Capo di Bove melilite leucitite lava (cecilite), Alban Hills, Italy

Published online by Cambridge University Press:  05 July 2018

L. Melluso*
Affiliation:
Dipartimento di Scienze della Terra, Università di Napoli Federico II, Italy
S. Conticelli
Affiliation:
Dipartimento di Scienze della Terra, Università di Firenze, Italy Istituto di Geoscienze e Georisorse (I.G.G.), CNR, Firenze, Italy
R. de' Gennaro
Affiliation:
Centro Interdipartimentale di Strumentazioni per Analisi Geomineralogiche (C.I.S.A.G.), Università di Napoli Federico II, Italy
*

Abstract

Kirschsteinite (mainly CaFeSiO4), in association with forsterite-fayalite solid solutions, melilite, clinopyroxene, leucite, nepheline and several minor phases, is reported for the first time in the 290 ka Capo di Bove melilite-leucitite lava flow of the Alban Hills volcanic complex (Italy). Kirschsteinite appears very late in the crystallization sequence, as indicated by textural and chemical evidence (Mg# ≈ 25). It shows significant solid solution towards fayalite, and is found with groundmass phases indicating a relatively low-temperature melt composition more silica-undersaturated than phonolite (i.e. devoid of alkali feldspar). This clearly points to the very silica-undersaturated nature of almost all the Alban Hills volcanic rocks.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2010

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