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Strontian fluoro-magnesiohastingsite in Alban Hills lavas (Central Italy): constraints on crystallization conditions

Dipartimento di Scienze della Terra, Università degli Studi ‘La Sapienza’, P. le Aldo Moro 5, I-00185 Roma, Italy

^* E-mail: mario.gaeta{at}uniroma1.it

A magmatic calcic amphibole (^M4Ca 1.50) characterized by large Sr and F contents (SrO>1 wt.%, F>2.5 wt.%) is described. According to the crystal-chemical formula, the amphibole can be classified as a strontian fluoro-magnesiohastingsite and the presence of Sr cations in the A sites is suggested. The amphibole occurs in the groundmass of ultrapotassic lavas from the Alban Hills Volcanic District (Central Italy). This peculiar chemical composition is due to the lavas’ groundmass compositional trend occurring under low silica-activity conditions. We suggest that the occurrence of F amphiboles allows us to consider the Alban Hills Volcanic District magmas to be as rich in F as other ultrapotassic magmas.

KEYWORDS: amphibole, fluorine, strontium, ultrapotassic magma, Alban Hills Volcanic District, Italy

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