Constraints on duration, age and migration of the feeder systems of the Madagascan
flood basalt province from high-precision 40Ar/39Ar chronology
Version 2 2021-06-10, 11:29
Version 1 2021-04-29, 11:25
Posted on 2021-04-29 - 11:25
The Late Cretaceous magmatism in Madagascar is correlated with the break-up
between Madagascar and Greater India, with a presumed track of a hotspot from
Madagascar towards the Marion Island. The lava succession and associated dike
swarms and sills of western Madagascar (Mailaka area) represent a volumetrically
important area of the igneous province. Using plagioclase separates, we obtained two
plateau 40 Ar/ 39 Ar ages, and an inverse isochron age ranging from 91.2 ± 1.3 to
92.9 ± 3.8 Ma (2σ). These ages are close to the Cenomanian–Turonian (C–T; 93.9 ±
0.2 Ma) boundary and are indistinguishable from the U–Pb ages available for the
capping rhyodacitic unit of the Mailaka lava succession. A filtered compilation of eight
ages for northern and central-western Madagascar rocks suggests a duration of the
magmatic activity in this part of province in the order of c.3 Ma. If the western
Madagascar magmatism is plume-related, the Marion plume would be better located
near the Mailaka area at c.93 Ma. The geochemistry of the mafic lavas and dykes of
western Madagascar is barely distinguishable from MORB, with an increasing crustal
contamination towards the evolved rocks, and does not constrain input of typical
components derived by plume magmatism.
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Cucciniello, Ciro; Morra, Vincenzo; Jourdan, Fred (2021). Constraints on duration, age and migration of the feeder systems of the Madagascan
flood basalt province from high-precision 40Ar/39Ar chronology. Geological Society of London. Collection. https://doi.org/10.6084/m9.figshare.c.5407260.v1
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