Details
| Original language | English |
|---|---|
| Pages (from-to) | 434-437 |
| Number of pages | 4 |
| Journal | American Mineralogist |
| Volume | 82 |
| Issue number | 3-4 |
| Publication status | Published - 1 Apr 1997 |
Abstract
The solubility of H2O in a series of 13 melts based on a haplogranitic composition (HPG8) have been determined for the conditions of 500-5000 bar pressure and 800-1000°C. The compositions represent the additions of individual components to HPG8 to generate peralkaline and peraluminous compositions, respectively. H2O solubility increases with added excess alkali oxide. Compared on a weight percent basis, the solubility of H2O for a given degree of peralkalinity increases in the order Cs, Rb<K<Na<Li. On a molar equivalent basis the effects of excess Bs, Rb, K, and Na on increasing the solubility of H2O are the same, whereas the effect of Li2O is somewhat lower. For the peraluminous compositions, the solubility of H2O decreases with the addition of 2 wt.% Al2O3, to the HPG8 composition, then increases strongly with the further addition of excess Al2O3. The solubility of H2O in the melt with 5 wt.% excess Al2O3 is significantly larger than that in HPG8. The addition of Na2O up to levels of peralkalinity commonly encountered in glassy magmatic eruptive rocks of peralkaline volcanic provinces leads to an almsot doubling of the low pressure (500 bar) solubility of H2O in the melt.
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geophysics
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
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In: American Mineralogist, Vol. 82, No. 3-4, 01.04.1997, p. 434-437.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - The solubility of H2O in peralkaline and peraluminous granitic melts
AU - Dingwell, D. B.
AU - Holtz, Francois
AU - Behrens, Harald
N1 - Copyright: Copyright 2018 Elsevier B.V., All rights reserved.
PY - 1997/4/1
Y1 - 1997/4/1
N2 - The solubility of H2O in a series of 13 melts based on a haplogranitic composition (HPG8) have been determined for the conditions of 500-5000 bar pressure and 800-1000°C. The compositions represent the additions of individual components to HPG8 to generate peralkaline and peraluminous compositions, respectively. H2O solubility increases with added excess alkali oxide. Compared on a weight percent basis, the solubility of H2O for a given degree of peralkalinity increases in the order Cs, Rb<K<Na<Li. On a molar equivalent basis the effects of excess Bs, Rb, K, and Na on increasing the solubility of H2O are the same, whereas the effect of Li2O is somewhat lower. For the peraluminous compositions, the solubility of H2O decreases with the addition of 2 wt.% Al2O3, to the HPG8 composition, then increases strongly with the further addition of excess Al2O3. The solubility of H2O in the melt with 5 wt.% excess Al2O3 is significantly larger than that in HPG8. The addition of Na2O up to levels of peralkalinity commonly encountered in glassy magmatic eruptive rocks of peralkaline volcanic provinces leads to an almsot doubling of the low pressure (500 bar) solubility of H2O in the melt.
AB - The solubility of H2O in a series of 13 melts based on a haplogranitic composition (HPG8) have been determined for the conditions of 500-5000 bar pressure and 800-1000°C. The compositions represent the additions of individual components to HPG8 to generate peralkaline and peraluminous compositions, respectively. H2O solubility increases with added excess alkali oxide. Compared on a weight percent basis, the solubility of H2O for a given degree of peralkalinity increases in the order Cs, Rb<K<Na<Li. On a molar equivalent basis the effects of excess Bs, Rb, K, and Na on increasing the solubility of H2O are the same, whereas the effect of Li2O is somewhat lower. For the peraluminous compositions, the solubility of H2O decreases with the addition of 2 wt.% Al2O3, to the HPG8 composition, then increases strongly with the further addition of excess Al2O3. The solubility of H2O in the melt with 5 wt.% excess Al2O3 is significantly larger than that in HPG8. The addition of Na2O up to levels of peralkalinity commonly encountered in glassy magmatic eruptive rocks of peralkaline volcanic provinces leads to an almsot doubling of the low pressure (500 bar) solubility of H2O in the melt.
UR - http://www.scopus.com/inward/record.url?scp=0030732032&partnerID=8YFLogxK
U2 - 10.2138/am-1997-3-421
DO - 10.2138/am-1997-3-421
M3 - Article
AN - SCOPUS:0030732032
VL - 82
SP - 434
EP - 437
JO - American Mineralogist
JF - American Mineralogist
SN - 0003-004X
IS - 3-4
ER -