Please Note:

The Open Access Repository has moved to a new authentication system as of the 1st of November.

Account holders will now be able to login using their University of Tasmania credentials.
If you have trouble logging in please email us on so we can assist you.

Public users can still access the records in this repository as normal

Open Access Repository

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


Downloads per month over past year

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

PeriodMiner-200...pdf | Download (692kB)
Available under University of Tasmania Standard License.

| Preview


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
Item Statistics: View statistics for this item

Actions (login required)

Item Control Page Item Control Page