Details
| Original language | English |
|---|---|
| Pages (from-to) | 1223-1241 |
| Number of pages | 19 |
| Journal | American Mineralogist |
| Volume | 77 |
| Issue number | 11-12 |
| Publication status | Published - Jan 1992 |
Abstract
Liquidus phase relations have been experimentally determined in the system Qz-Or-Ab at 2 and 5 kbar under both H2O-saturated and H2O-undersaturated conditions. Six liquidus surfaces, corresponding to an initial fluid phase composition of 1, 0.7, and 0.5 at 2 kbar and 1, 0.85, and 0.7 at 5 kbar, were studied. For both pressures, H2O solubilities decrease with decreasing XInH2O. H2O activities (aH2O), calculated for compositions close to the thermal minimum of the corresponding liquidus surface are 1, 0.5, and 0.25 at 2 kbar and 1, 0.6, and 0.4 at 5 kbar. The data for H2O-saturated conditions are in good agreement with Tuttle and Bowen (1958) at 2 kbar. At 5 kbar, the quartz-feldspar field boundary is richer in normative quartz by 2-6 wt.%, compared with Luth et al. (1964). The rise in liquidus temperatures with decreasing H2O contrast of the melt is more marked for Ab- than for Or-rich compositions. Results suggest a differential reactivity of Ab- and Or-forming units in the melt with H2O, consistent with higher H2O solubilities in Ab-rich than in Or-rich melts. -from Authors
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. 77, No. 11-12, 01.1992, p. 1223-1241.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Effects of H2O on liquidus phase relations in the haplogranite system at 2 and 5 kbar
AU - Holtz, Francois
AU - Pichavant, Michel
AU - Barbey, Pierre
AU - Johannes, Wilhelm
N1 - Copyright: Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1992/1
Y1 - 1992/1
N2 - Liquidus phase relations have been experimentally determined in the system Qz-Or-Ab at 2 and 5 kbar under both H2O-saturated and H2O-undersaturated conditions. Six liquidus surfaces, corresponding to an initial fluid phase composition of 1, 0.7, and 0.5 at 2 kbar and 1, 0.85, and 0.7 at 5 kbar, were studied. For both pressures, H2O solubilities decrease with decreasing XInH2O. H2O activities (aH2O), calculated for compositions close to the thermal minimum of the corresponding liquidus surface are 1, 0.5, and 0.25 at 2 kbar and 1, 0.6, and 0.4 at 5 kbar. The data for H2O-saturated conditions are in good agreement with Tuttle and Bowen (1958) at 2 kbar. At 5 kbar, the quartz-feldspar field boundary is richer in normative quartz by 2-6 wt.%, compared with Luth et al. (1964). The rise in liquidus temperatures with decreasing H2O contrast of the melt is more marked for Ab- than for Or-rich compositions. Results suggest a differential reactivity of Ab- and Or-forming units in the melt with H2O, consistent with higher H2O solubilities in Ab-rich than in Or-rich melts. -from Authors
AB - Liquidus phase relations have been experimentally determined in the system Qz-Or-Ab at 2 and 5 kbar under both H2O-saturated and H2O-undersaturated conditions. Six liquidus surfaces, corresponding to an initial fluid phase composition of 1, 0.7, and 0.5 at 2 kbar and 1, 0.85, and 0.7 at 5 kbar, were studied. For both pressures, H2O solubilities decrease with decreasing XInH2O. H2O activities (aH2O), calculated for compositions close to the thermal minimum of the corresponding liquidus surface are 1, 0.5, and 0.25 at 2 kbar and 1, 0.6, and 0.4 at 5 kbar. The data for H2O-saturated conditions are in good agreement with Tuttle and Bowen (1958) at 2 kbar. At 5 kbar, the quartz-feldspar field boundary is richer in normative quartz by 2-6 wt.%, compared with Luth et al. (1964). The rise in liquidus temperatures with decreasing H2O contrast of the melt is more marked for Ab- than for Or-rich compositions. Results suggest a differential reactivity of Ab- and Or-forming units in the melt with H2O, consistent with higher H2O solubilities in Ab-rich than in Or-rich melts. -from Authors
UR - http://www.scopus.com/inward/record.url?scp=0027087842&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0027087842
VL - 77
SP - 1223
EP - 1241
JO - American Mineralogist
JF - American Mineralogist
SN - 0003-004X
IS - 11-12
ER -