Details
| Original language | English |
|---|---|
| Pages (from-to) | 1336-1345 |
| Number of pages | 10 |
| Journal | American Mineralogist |
| Volume | 84 |
| Issue number | 9 |
| Publication status | Published - 1 Sept 1999 |
Abstract
Solution mechanisms of P in peraluminous glasses and melts in the system CaO-Na2O-K2O-Al2O3-SiO2-P2O5 have been examined with in-situ microRaman spectroscopy from ambient temperature to near 1200 °C. The principal aim was to examine the relative stabilities of phosphate complexes as functions of P content, peraluminosity, and temperature. Increasing peraluminosity was accomplished by increasing the proportions of Al3+ and Ca2+ of constant SiO2 content. The molar ratio Al2O3/(CaO+Na2O+K2O) (A/CNK) ranged from ~1 to ~1.3. In all compositions, P5+ is bonded to Al3+ to form AlPO4 complexes. In addition, there is evidence for pyrophosphate complexing (P2O7). In melts with the highest (Ca+Na+K)/P, there is probably also a small fraction of orthophosphate complexes present. The relative importance of AlPO4-like complexes is correlated positively with peraluminosity (A/CNK), P2O5 content, and increasing temperature at temperatures above that of the glass transition. These structural relationships among phosphate complexes are coupled with decreasing polymerization of the aluminosilicate melts.
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. 84, No. 9, 01.09.1999, p. 1336-1345.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - The effect of temperature and bulk composition on the solution mechanism of phosphorus in peraluminous haplogranitic magma
AU - Mysen, B. O.
AU - Holtz, Francois
AU - Pichavant, Michel
AU - Beny, J. M.
AU - Montel, J. M.
N1 - Copyright: Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1999/9/1
Y1 - 1999/9/1
N2 - Solution mechanisms of P in peraluminous glasses and melts in the system CaO-Na2O-K2O-Al2O3-SiO2-P2O5 have been examined with in-situ microRaman spectroscopy from ambient temperature to near 1200 °C. The principal aim was to examine the relative stabilities of phosphate complexes as functions of P content, peraluminosity, and temperature. Increasing peraluminosity was accomplished by increasing the proportions of Al3+ and Ca2+ of constant SiO2 content. The molar ratio Al2O3/(CaO+Na2O+K2O) (A/CNK) ranged from ~1 to ~1.3. In all compositions, P5+ is bonded to Al3+ to form AlPO4 complexes. In addition, there is evidence for pyrophosphate complexing (P2O7). In melts with the highest (Ca+Na+K)/P, there is probably also a small fraction of orthophosphate complexes present. The relative importance of AlPO4-like complexes is correlated positively with peraluminosity (A/CNK), P2O5 content, and increasing temperature at temperatures above that of the glass transition. These structural relationships among phosphate complexes are coupled with decreasing polymerization of the aluminosilicate melts.
AB - Solution mechanisms of P in peraluminous glasses and melts in the system CaO-Na2O-K2O-Al2O3-SiO2-P2O5 have been examined with in-situ microRaman spectroscopy from ambient temperature to near 1200 °C. The principal aim was to examine the relative stabilities of phosphate complexes as functions of P content, peraluminosity, and temperature. Increasing peraluminosity was accomplished by increasing the proportions of Al3+ and Ca2+ of constant SiO2 content. The molar ratio Al2O3/(CaO+Na2O+K2O) (A/CNK) ranged from ~1 to ~1.3. In all compositions, P5+ is bonded to Al3+ to form AlPO4 complexes. In addition, there is evidence for pyrophosphate complexing (P2O7). In melts with the highest (Ca+Na+K)/P, there is probably also a small fraction of orthophosphate complexes present. The relative importance of AlPO4-like complexes is correlated positively with peraluminosity (A/CNK), P2O5 content, and increasing temperature at temperatures above that of the glass transition. These structural relationships among phosphate complexes are coupled with decreasing polymerization of the aluminosilicate melts.
UR - http://www.scopus.com/inward/record.url?scp=0033378407&partnerID=8YFLogxK
U2 - 10.2138/am-1999-0910
DO - 10.2138/am-1999-0910
M3 - Article
AN - SCOPUS:0033378407
VL - 84
SP - 1336
EP - 1345
JO - American Mineralogist
JF - American Mineralogist
SN - 0003-004X
IS - 9
ER -