Details
| Original language | English |
|---|---|
| Pages (from-to) | 3725-3736 |
| Number of pages | 12 |
| Journal | Geochimica et Cosmochimica Acta |
| Volume | 64 |
| Issue number | 21 |
| Publication status | Published - 19 Oct 2000 |
Abstract
To determine the effect of water on the rheology of depolymerized melts, we have measured the viscosity of two series of hydrated synthetic aluminosilicate melts analogous in bulk polymerization to tephritic and basanitic liquids. The measurements have been made at 1 atm in the range 108.7 to 1013.7 Pa s, for water contents between 0 and 2.5 wt.% H2O. In all cases, water exerts a marked depressing effect on the viscosity but the reduction is much smaller than for the more polymerized compositions studied previously. With the addition of 2 wt.% H2O, for example, extrapolation of the results suggests that the viscosity decreases by ca. 4.5 and 1.5 orders of magnitude at 900 and 1200 K, respectively. An interesting consequence is that the viscosity and glass transition temperatures of the most polymerized melts become lower than those of depolymerized melts at water contents higher than ca. 1 wt.%. By analogy with natural magmatic compositions, hydrous rhyolites may become less viscous than hydrous basalts at high water contents and low temperatures. In nature, the viscosities of polymerized and depolymerized magmatic liquids should be similar because basalts are emplaced at higher temperatures but rhyolites typically have higher water contents. Copyright (C) 2000 Elsevier Science Ltd.
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
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In: Geochimica et Cosmochimica Acta, Vol. 64, No. 21, 19.10.2000, p. 3725-3736.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Water and the viscosity of depolymerized aluminosilicate melts
AU - Whittington, Alan
AU - Richet, Pascal
AU - Holtz, Francois
N1 - Copyright: Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2000/10/19
Y1 - 2000/10/19
N2 - To determine the effect of water on the rheology of depolymerized melts, we have measured the viscosity of two series of hydrated synthetic aluminosilicate melts analogous in bulk polymerization to tephritic and basanitic liquids. The measurements have been made at 1 atm in the range 108.7 to 1013.7 Pa s, for water contents between 0 and 2.5 wt.% H2O. In all cases, water exerts a marked depressing effect on the viscosity but the reduction is much smaller than for the more polymerized compositions studied previously. With the addition of 2 wt.% H2O, for example, extrapolation of the results suggests that the viscosity decreases by ca. 4.5 and 1.5 orders of magnitude at 900 and 1200 K, respectively. An interesting consequence is that the viscosity and glass transition temperatures of the most polymerized melts become lower than those of depolymerized melts at water contents higher than ca. 1 wt.%. By analogy with natural magmatic compositions, hydrous rhyolites may become less viscous than hydrous basalts at high water contents and low temperatures. In nature, the viscosities of polymerized and depolymerized magmatic liquids should be similar because basalts are emplaced at higher temperatures but rhyolites typically have higher water contents. Copyright (C) 2000 Elsevier Science Ltd.
AB - To determine the effect of water on the rheology of depolymerized melts, we have measured the viscosity of two series of hydrated synthetic aluminosilicate melts analogous in bulk polymerization to tephritic and basanitic liquids. The measurements have been made at 1 atm in the range 108.7 to 1013.7 Pa s, for water contents between 0 and 2.5 wt.% H2O. In all cases, water exerts a marked depressing effect on the viscosity but the reduction is much smaller than for the more polymerized compositions studied previously. With the addition of 2 wt.% H2O, for example, extrapolation of the results suggests that the viscosity decreases by ca. 4.5 and 1.5 orders of magnitude at 900 and 1200 K, respectively. An interesting consequence is that the viscosity and glass transition temperatures of the most polymerized melts become lower than those of depolymerized melts at water contents higher than ca. 1 wt.%. By analogy with natural magmatic compositions, hydrous rhyolites may become less viscous than hydrous basalts at high water contents and low temperatures. In nature, the viscosities of polymerized and depolymerized magmatic liquids should be similar because basalts are emplaced at higher temperatures but rhyolites typically have higher water contents. Copyright (C) 2000 Elsevier Science Ltd.
UR - http://www.scopus.com/inward/record.url?scp=0033708752&partnerID=8YFLogxK
U2 - 10.1016/S0016-7037(00)00448-8
DO - 10.1016/S0016-7037(00)00448-8
M3 - Article
AN - SCOPUS:0033708752
VL - 64
SP - 3725
EP - 3736
JO - Geochimica et Cosmochimica Acta
JF - Geochimica et Cosmochimica Acta
SN - 0016-7037
IS - 21
ER -