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Интеллектуальная Система Тематического Исследования НАукометрических данных |
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Comparative Characteristics of the Layering of Mafic–UltramaficIntrusions of the Oulanka Group, Northern Kareliaстатья
- Авторы: Tskhovrebova A.R., Koptev-Dvornikov E.V., Bychkov D.A.
- Журнал: Petrology
- Том: 30
- Номер: 6
- Год издания: 2022
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 610
- Последняя страница: 627
- DOI: 10.1134/S0869591122060091
- Аннотация: The Oulanka group is a compact group of three peridotite–gabbronorite intrusions that is convenient for testing various petrogenetic concepts. The three intrusions are similar in age and occur not far fromone another but differ in the composition of their original magmas, are characterized by different sets ofcumulus mineral assemblages, and are different in inner structure and rhythmic layering. We applied clusteranalysis of the contents of major elements to reproduce the cumulus mineral assemblages of the isochemicallyaltered rocks of the Tsipringa and Lukkulaisvaara massifs. Although the parental magmas of the Kivakka andTsipringa massifs were of different composition and their crystallization sequences were also different, thevertical sections of these massifs can be clearly subdivided into zones according to their cumulus mineralassemblages, with the limited development of rhythmic interbedding (with individual rhythms ranging froma few to a few dozen meters in thickness). Conversely, the Lukkulaisvaara intrusion does not possess anyclearly distinguishable cumulus zones, and large-scale rhythmic layering is traceable throughout the entirethickness of the massif (with rhythms ranging from a few dozen to a few hundred meters in thickness). Thedifferent character of the rhythmic layering of the three intrusions may provide an insight into the differentscenarios of magma convection in the chambers.
- Добавил в систему: Коптев-Дворников Евгений Владимирович