The effect of silica on ferric/ferrous ratio in silicate melts: An experimental study using Mossbauer spectroscopy

被引：32
|
作者：
Borisov, Alexander [1 ,2 ]
McCammon, Catherine [2 ]
机构：
[1] Russian Acad Sci, Inst Geol Ore Deposit Petrog Mineral & Geochem, Moscow 119017, Russia
[2] Univ Bayreuth, Bayer Geoinst, D-95440 Bayreuth, Germany
来源：
AMERICAN MINERALOGIST | 2010年 / 95卷 / 04期
基金：
俄罗斯基础研究基金会;
关键词：
Mossbauer spectroscopy; ferric/ferrous ratio; silicate melts; experiments; HYPERFINE PARAMETER DISTRIBUTIONS; FERRIC-FERROUS RATIO; REDOX EQUILIBRIA; OXIDATION-STATE; OXYGEN FUGACITY; OPTICAL BASICITY; IRON; LIQUIDS; FE; GLASSES;
D O I：
10.2138/am.2010.3217
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
We conducted a Mossbauer study of synthetic glasses with anorthite-diopside eutectic composition modified with either 5 or 1 wt% Fe2O3 and variable amounts of silica. Glasses were synthesized in air in the temperature range 1400-1570 degrees C. Room-temperature Mossbauer spectra showed the presence of magnetically ordered Fe3+, for which a systematic fitting procedure was developed to correctly estimate Fe3+/Fe2+. At constant T-fo(2) we observed a minimum in the variation of Fe3+/Fe2+ ratio with silica that varied from 56 to 63 wt% SiO2, depending on temperature. It was also demonstrated that the temperature dependence of the ferric/ferrous ratio [log(Fe3+/Fe2+) vs. I/T] is essentially similar for basic and silicic melts.
引用
收藏
页码：545 / 555
页数：11
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