40Ar/39Ar age of Mendanha Alkaline Intrusion, Rio de Janeiro, Brazil
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Mota, C.
Geraldes, M.
Jourdan, Fred
Date
2014Type
Journal Article
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Mota, C. and Geraldes, M. and Jourdan, F. 2014. 40Ar/39Ar age of Mendanha Alkaline Intrusion, Rio de Janeiro, Brazil. Comunicacoes Geologicas. 101 (S1): pp. 157-161.
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Comunicacoes Geologicas
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Department of Applied Geology
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Abstract
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.
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