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Geochemical Nature and Age of the Plagiogranite–Gabbronorite Association of the Oceanic Coreстатья
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: 27 января 2018 г.
- Авторы: Silantyev S.A., Koepke J., Ariskin A.A., Anosova M.O., Krasnova E.A., Dubinina E.O., Suhr G.
- Журнал: Petrology
- Том: 22
- Номер: 2
- Год издания: 2014
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 109
- Последняя страница: 127
- DOI: 10.1134/S0869591114020064
- Аннотация: Our newly obtained data on the geochemistry and age of plagiogranite–gabbronorite association in the oceanic core complex of the MidAtlantic Ridge (MAR) at 5°10 S suggest close genetic relations between these rocks in this segment of the ridge. The U/Pb zircon age of an oceanic plagiogranite (OPG)sample is 1.059 ± 0.055 Ma and is in good agreement with the zircon age of plutonic rocks in the oceanic core complex of northern MAR. A distinctive geochemical feature of the rocks is their unusually depleted 87Sr/86Sr and 143Nd/144Nd ratios, which suggest that the plutonic rocks of the gabbronorite–plagiogranite association in MAR at 5°10 S could be derived from the most strongly depleted mantle reservoir of all known to occur beneath the axial MAR zone. The COMAGMAT5.2 numerical thermodynamic simulation of the possible crystallization links between the plagiogranite and gabbronorite from the MAR segment at 5°10 S led us to conclude that the leading role in the origin of the plagiogranite was played by a twostage process: the partialmelting of the gabbronorite and the subsequent fractionation of the newly generated melt. The regional differences between the isotopicgeochemical parameters of MAR plagiogranites can, perhaps, reflect local specifics of socalled hydrothermal anatexis, such as the geochemical features of the rocks involved in this process and the parameters of the hydrothermal process, for example, variations in the W/R ratio.
- Добавил в систему: Силантьев Сергей Александрович