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Fluid inclusion evidence of second immiscibility within magmatic fluids (79AD eruption of Mt. Vesuvius)
Citation
Fulignati, P and Kamenetsky, VS and Marianelli, P and Sbrana, A, Fluid inclusion evidence of second immiscibility within magmatic fluids (79AD eruption of Mt. Vesuvius), Periodico di Mineralogia, 74, (1) pp. 43-54. ISSN 0369-8963 (2005) [Refereed Article]
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 ± nahcolite). Microthermometric experiments indicate nearly magmatic trapping temperatures (760°C to 830°C) of the homogeneous chloride-carbonate liquid. Cooling of such liquid produces two immiscible melt phases (chlorides and carbonates) at 455-435°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 Details
Item Type: | Refereed Article |
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Research Division: | Earth Sciences |
Research Group: | Geology |
Research Field: | Igneous and metamorphic petrology |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the earth sciences |
UTAS Author: | Kamenetsky, VS (Professor Vadim Kamenetsky) |
ID Code: | 39060 |
Year Published: | 2005 |
Web of Science® Times Cited: | 7 |
Deposited By: | Centre for Ore Deposit Research - CODES CoE |
Deposited On: | 2005-08-01 |
Last Modified: | 2010-08-25 |
Downloads: | 0 |
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