Details
| Original language | English |
|---|---|
| Pages (from-to) | 89-97 |
| Number of pages | 9 |
| Journal | Chemical geology |
| Volume | 259 |
| Issue number | 1-2 |
| Publication status | Published - 1 Nov 2008 |
Abstract
The viscosity of latitic melts occurring as enclaves in the rhyolitic lava flow of Rocche Rosse (RR, Lipari, Aeolian Islands, Italy) has been measured in the high T range (1323-1473 K) for a dissolved water content varying from 1.23 to 4.39 wt.%. Measurements were performed by the falling sphere method in an internally heated gas pressure vessel. As expected, the viscosity of latite decreases with increasing water content and temperature. No pressure effect was detected between 200 and 500 MPa. Combining the new viscosity data for hydrous melts with data for dry latite of similar base composition [Giordano, D., Mangiacapra, A., Potuzak, M., Russell, J.K., Romano, C., Dingwell, D.B., Di Muro, A., 2006. An expanded non-Arrhenian model for silicate melt viscosity: a treatment for metaluminous, peraluminous and peralkaline liquids. Chemical Geology 229, 42-56.] we propose an empirical equation to estimate the viscosity of latitic melts as a function of temperature and water content over the range 101 to 1012 Pa s. The obtained relationship reproduces the experimental data with a 1σ standard deviation of 0.22 log units. However, the empirical model is not constrained by data for hydrous melts at high viscosity and, therefore, it can only be used at low temperatures for water-poor melts. The viscosity data were used to model mixing-mingling processes between latitic and rhyolitic magmas at conditions relevant for the Rocche Rosse (RR, Lipari, Aeolian Islands) and La Fossa Cone 1888-1890 (LFC, Vulcano, Aeolian Islands) eruptions. The results demonstrate that the ratio between mafic and silicic end-members is the main parameter governing mixing-mingling interactions between magmas. This study suggests a faster ascent of magma underneath Vulcano compared to Lipari, which may be taken into account in hazard forecasting.
Keywords
- Aeolian Islands, Falling sphere method, Latite, Lipari, Viscosity, Vulcano
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geology
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
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In: Chemical geology, Vol. 259, No. 1-2, 01.11.2008, p. 89-97.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - The viscosity of latitic melts from Lipari (Aeolian Islands, Italy)
T2 - Inference on mixing-mingling processes in magmas
AU - Davì, M.
AU - Behrens, H.
AU - Vetere, F.
AU - De Rosa, R.
PY - 2008/11/1
Y1 - 2008/11/1
N2 - The viscosity of latitic melts occurring as enclaves in the rhyolitic lava flow of Rocche Rosse (RR, Lipari, Aeolian Islands, Italy) has been measured in the high T range (1323-1473 K) for a dissolved water content varying from 1.23 to 4.39 wt.%. Measurements were performed by the falling sphere method in an internally heated gas pressure vessel. As expected, the viscosity of latite decreases with increasing water content and temperature. No pressure effect was detected between 200 and 500 MPa. Combining the new viscosity data for hydrous melts with data for dry latite of similar base composition [Giordano, D., Mangiacapra, A., Potuzak, M., Russell, J.K., Romano, C., Dingwell, D.B., Di Muro, A., 2006. An expanded non-Arrhenian model for silicate melt viscosity: a treatment for metaluminous, peraluminous and peralkaline liquids. Chemical Geology 229, 42-56.] we propose an empirical equation to estimate the viscosity of latitic melts as a function of temperature and water content over the range 101 to 1012 Pa s. The obtained relationship reproduces the experimental data with a 1σ standard deviation of 0.22 log units. However, the empirical model is not constrained by data for hydrous melts at high viscosity and, therefore, it can only be used at low temperatures for water-poor melts. The viscosity data were used to model mixing-mingling processes between latitic and rhyolitic magmas at conditions relevant for the Rocche Rosse (RR, Lipari, Aeolian Islands) and La Fossa Cone 1888-1890 (LFC, Vulcano, Aeolian Islands) eruptions. The results demonstrate that the ratio between mafic and silicic end-members is the main parameter governing mixing-mingling interactions between magmas. This study suggests a faster ascent of magma underneath Vulcano compared to Lipari, which may be taken into account in hazard forecasting.
AB - The viscosity of latitic melts occurring as enclaves in the rhyolitic lava flow of Rocche Rosse (RR, Lipari, Aeolian Islands, Italy) has been measured in the high T range (1323-1473 K) for a dissolved water content varying from 1.23 to 4.39 wt.%. Measurements were performed by the falling sphere method in an internally heated gas pressure vessel. As expected, the viscosity of latite decreases with increasing water content and temperature. No pressure effect was detected between 200 and 500 MPa. Combining the new viscosity data for hydrous melts with data for dry latite of similar base composition [Giordano, D., Mangiacapra, A., Potuzak, M., Russell, J.K., Romano, C., Dingwell, D.B., Di Muro, A., 2006. An expanded non-Arrhenian model for silicate melt viscosity: a treatment for metaluminous, peraluminous and peralkaline liquids. Chemical Geology 229, 42-56.] we propose an empirical equation to estimate the viscosity of latitic melts as a function of temperature and water content over the range 101 to 1012 Pa s. The obtained relationship reproduces the experimental data with a 1σ standard deviation of 0.22 log units. However, the empirical model is not constrained by data for hydrous melts at high viscosity and, therefore, it can only be used at low temperatures for water-poor melts. The viscosity data were used to model mixing-mingling processes between latitic and rhyolitic magmas at conditions relevant for the Rocche Rosse (RR, Lipari, Aeolian Islands) and La Fossa Cone 1888-1890 (LFC, Vulcano, Aeolian Islands) eruptions. The results demonstrate that the ratio between mafic and silicic end-members is the main parameter governing mixing-mingling interactions between magmas. This study suggests a faster ascent of magma underneath Vulcano compared to Lipari, which may be taken into account in hazard forecasting.
KW - Aeolian Islands
KW - Falling sphere method
KW - Latite
KW - Lipari
KW - Viscosity
KW - Vulcano
UR - http://www.scopus.com/inward/record.url?scp=58649092174&partnerID=8YFLogxK
U2 - 10.1016/j.chemgeo.2008.10.009
DO - 10.1016/j.chemgeo.2008.10.009
M3 - Article
AN - SCOPUS:58649092174
VL - 259
SP - 89
EP - 97
JO - Chemical geology
JF - Chemical geology
SN - 0009-2541
IS - 1-2
ER -