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.

Kirschsteinite in the Capo Bove melilite leucitite (cecilite), Alban Hills, Italy / L. MELLUSO; S. CONTICELLI; R. DE’ GENNARO. - In: MINERALOGICAL MAGAZINE. - ISSN 0026-461X. - STAMPA. - 74:(2010), pp. 859-874. [10.1180/minmag.2010.074.5.859]

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

CONTICELLI, SANDRO;
2010

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.
2010
74
859
874
L. MELLUSO; S. CONTICELLI; R. DE’ GENNARO
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/393597
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