40Ar–39Ar ages and isotope geochemistry of Cretaceous basalts in northern Madagascar: Refining eruption ages, extent of crustal contamination and parental magmas in a flood basalt province
The Madagascar Cretaceous igneous province exposed in the Mahajanga basin is represented by basalt and basaltic andesite lavas. New 40Ar–39Ar plateau ages (92.3 ± 2.0 Ma and 91.5 ± 1.3 Ma) indicate that the magmatism in the Mahajanga basin started about 92 Ma ago. Four geochemically distinct magma t...
| Main Authors: | , , , , , |
|---|---|
| Format: | Journal Article |
| Published: |
Cambridge University Press
2013
|
| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.11937/44742 |