40Ar/39Ar age of Mendanha Alkaline Intrusion, Rio de Janeiro, Brazil
MetadataShow full item record
The Mendanha Alkaline Intrusion is one of many alkaline occurences of the Southeastern Brazil Alkaline Province. It comprises plutonic rocks (alkali-syenites and syenites) and hypabyssal types (trachytes and ignibrites). In this work is presented new 40 Ar/ 39 Ar ages for this massif. The last reported ages were about 74 My and 65 My by K/Ar method published in 1988. The obtained results show ages of about 64 My (64.12 ± 0.40, 64.04 ± 0.42) e 58 My (58.55 ± 0.45, 57.95 ± 0.69), which are correlated to neighbour magmatic intrusions.
Showing items related by title, author, creator and subject.
Plume-Lithosphere Interaction during Migration of Cretaceous Alkaline Magmatism in SW Portugal: Evidence from U-Pb Ages and Pb-Sr-Hf IsotopesGrange, Marion; Scharer, U.; Merle, R.; Girardeau, J.; Cornen, G. (2010)Large massifs of alkaline rocks are exposed along ∼250 km of the Atlantic coast of Portugal. Their origin is still poorly understood, including the precise timing of their emplacement and their relationships with the ...
SHRIMP U-Pb zircon dating of the Katerina Ring Complex: Insights into the temporal sequence of Ediacaran calc-alkaline to peralkaline magmatism in southern Sinai, EgyptMoreno, J.; Montero, P.; Abu Anbar, M.; Molina, J.; Scarrow, J.; Talavera, Cristina; Cambeses, A.; Bea, F. (2012)SHRIMP U-Pb dating reveals that the hypabyssal Katerina Ring Complex formed over a ~. 9. Ma interval. The first rocks that formed were the alkaline to peralkaline granitoids that form the wall and the roof cap of the Ring ...
Enhancing carbon sequestration in soil with coal combustion products: a technology for minimising carbon footprints in coal-power generation and agricultureYunusa, I.; Blair, G.; Zerihun, Ayalsew; Yang, S.; Wilson, S.; Young, I. (2015)Coal-fired power generation and agriculture account for more than half of global greenhouse gas emissions, but the coal fly ash (CFA) produced in the former can be a resource for reducing emissions from agriculture to ...