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Fluid inclusion evidence of second immiscibility within magmatic fluids (79AD eruption of Mt. Vesuvius)

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Fulignati, P and Kamenetsky, VS and Marianelli, P and Sbrana, A (2005) Fluid inclusion evidence of second immiscibility within magmatic fluids (79AD eruption of Mt. Vesuvius). Periodico di Mineralogia, LXXIV. pp. 43-54. ISSN 0369-8963

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Abstract

Foid-bearing syenite cognate xenoliths represent fragments of the upper peripheral parts of the K-phonolitic portions of the 79 AD magma chamber, wrenched during the explosive eruption. Abundant multiphase fluid inclusions are hosted within K-feldspar and coexist with rare silicate melt inclusions. This gives evidence to the exsolution of a magmatic volatile-rich phase from the peripheral parts of the silicate magma chamber. The characterization of daughter mineral assemblage of these fluid inclusions, by SEM-EDS and Raman spectroscopy, indicates two ubiquitous main components: Na-K chlorides (halite + sylvite) and Na-Ca carbonates (calcite plus/minus nahcolite). Microthermometric experiments indicate nearly magmatic trapping temperatures (760 degrees C to 830 degrees C) of the homogeneous chloride-carbonate liquid. Cooling of such liquid produces two immiscible melt phases (chlorides and carbonates) at 455-435 degrees C. This suggests that a hypersaline-carbonate fluid, exsolved from the silicate magma, can further experience another unmixing event that would occur in essentially 'post-magmatic' environment.

Item Type: Article
Keywords: Vesuvius, foid-bearing syenites, fluid inclusions, immiscibility, exsolution
Journal or Publication Title: Periodico di Mineralogia
Page Range: pp. 43-54
ISSN: 0369-8963
Date Deposited: 27 Sep 2007
Last Modified: 18 Nov 2014 03:22
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