|
ИСТИНА |
Войти в систему Регистрация |
ИПМех РАН |
||
A limited role for metasomatized subarc mantle in the generation of boron isotope signatures of arc volcanic rocksстатья
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: 17 июля 2019 г.
- Авторы: Tomanikova Lubomira, Savov Ivan P., Harvey Jason, de Hoog Jan C.M., Churikova Tatiana G., Gordeychik Boris, Yogodzinski Gene M.
- Журнал: Geology
- Том: 47
- Номер: 6
- Год издания: 2019
- Издательство: Geological Society of America
- Местоположение издательства: United States
- Первая страница: 517
- Последняя страница: 521
- DOI: 10.1130/g46092.1
- Аннотация: Metasomatized subarc mantle is often regarded as one of the mantle reservoirs enriched in fluid-mobile elements (FMEs; e.g., B, Li, Cs, As, Sb, Ba, Rb, Pb), which, when subject to wet melting, will contribute to the characteristic FME-rich signature of arc volcanic rocks. Evidence of wet melts in the subarc mantle wedge is recorded in metasomatic amphibole-, phlogopite-, and pyroxene-bearing veins in ultramafic xenoliths recovered from arc volcanoes. Our new B and δ11B study of such veins in mantle xenoliths from Avachinsky and Shiveluch volcanoes, Kamchatka arc, indicates that slab-derived FMEs, including B and its characteristically high δ11B, are delivered directly to a melt that experiences limited interaction with the surrounding mantle before eruption. The exceptionally low B contents (from 0.2 to 3.1 µg g–1) and low δ11B (from –16.6‰ to +0.9‰) of mantle xenolith vein minerals are, instead, products of fluids and melts released from the isotopically light subducted and dehydrated altered oceanic crust and, to a lesser extent, from isotopically heavy serpentinite. Therefore, melting of amphibole- and phlogopite-bearing veins in a metasomatized mantle wedge cannot alone produce the characteristic FME geochemistry of arc volcanic rocks, which require a comparatively large, isotopically heavy and B-rich serpentinite-derived fluid component in their source.
- Добавил в систему: Гордейчик Борис Николаевич
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | Tomanikova_2019.pdf | 953,5 КБ | 10 июня 2019 [gordei@mail.ru] | |
| 2. | Tomanikova_2019_SM.pdf | Tomanikova_2019_SM.pdf | 1,1 МБ | 10 июня 2019 [gordei@mail.ru] |