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The effect of titanium and phosphorus on ferric/ferrous ratio in silicate melts: an experimental studyстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 30 декабря 2016 г.
- Авторы: Borisov A.A., Behrens H., Holtz F.
- Журнал: Contributions to Mineralogy and Petrology
- Том: 166
- Год издания: 2013
- Издательство: Springer Verlag
- Местоположение издательства: Germany
- Первая страница: 1577
- Последняя страница: 1591
- DOI: 10.1007/s00410-013-0943-9
- Аннотация: The effect of TiO2 and P2O5 on the ferric/ferrous ratio in silicate melts was investigated in model silicate melts at air conditions in the temperature range 1400-1550°C at 1 atm total pressure. The base composition of the anorthite-diopside eutectic composition was modified with 10 wt % Fe2O3 and variable amounts of TiO2 (up to 30 wt %) or P2O5 (up to 20 wt%). Some compositions also contained higher SiO2 concentrations to compare the role of SiO2, TiO2 and P2O5 on the Fe3+/Fe2+ ratio. The ferric/ferrous ratio in experimental glasses was analyzed using a wet-chemical technique with colorimetric detection of ferrous iron. It is shown that at constant temperature an increase of SiO2, TiO2 and P2O5 content results in a decrease of the ferric/ferrous ratio. The effects of TiO2 and SiO2 on the Fe3+/Fe2+ ratio was found to be almost identical. In contrast, adding P2O5 was found to decrease ferric/ferrous ratio much more effectively than adding silica. The results were compared with predictions from published empirical equations forecasting Fe3+/Fe2+ ratio. It was demonstrated that the effects of TiO2 are minor but that the effects of P2O5 should be included in models to better describe ferric/ferrous ratio in phosphorus-bearing silicate melts. Based on our observations, the determination of the prevailing fO2 in magmas from the Fe3+/Fe2+ ratio in natural glasses using empirical equations published so far is discussed critically.
- Добавил в систему: Борисов Александр Александрович
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | CMP166_Fe32-TiP_Borisov-13.pdf | CMP166_Fe32-TiP_Borisov-13.pdf | 831,1 КБ | 14 февраля 2023 [aborisov] |