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

被引：34

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

页码：545 / 555

页数：11

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