|
ИСТИНА |
Войти в систему Регистрация |
ИПМех РАН |
||
Fluid inclusion evidence of second immiscibility within magmatic fluids (79 AD eruption of Mt. Vesuvius)статья
Информация о цитировании статьи получена из
Scopus,
Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 6 декабря 2018 г.
- Авторы: Fulignati P., Kamenetsky V.S., Marianelli P., Sbrana A.
- Журнал: Periodico di Mineralogia
- Том: 74
- Номер: 1
- Год издания: 2005
- Издательство: Bardi Editore
- Местоположение издательства: Italy
- Первая страница: 43
- Последняя страница: 54
- Аннотация: Foid-bearing syenite cognate xenoliths represent fragments of the upper peripheral parts of the K-phonolitic portions of the 79 AD magma chamber, wrenched during the explosive eruption. Abundant multiphase fluid inclusions are hosted within K-feldspar and coexist with rare silicate melt inclusions. This gives evidence to the exsolution of a magmatic volatile-rich phase from the peripheral parts of the silicate magma chamber. The characterization of daughter mineral assemblage of these fluid inclusions, by SEM-EDS and Raman spectroscopy, indicates two ubiquitous main components: Na-K chlorides (halite + sylvite) and Na-Ca carbonates (calcite ± nahcolite). Microthermometric experiments indicate nearly magmatic trapping temperatures (760°C to 830°C) of the homogeneous chloride-carbonate liquid. Cooling of such liquid produces two immiscible melt phases (chlorides and carbonates) at 455-435°C. This suggests that a hypersaline-carbonate fluid, exsolved from the silicate magma, can further experience another unmixing event that would occur in essentially «post-magmatic» environment.
- Добавил в систему: Каменецкий Вадим Семенович