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- W2043311502 abstract "Palaeomagnetic and whole rock K-Ar data are reported from dolerite dykes from the east coast of Madagascar. The radiometric dates indicate that the dykes were injected 94.5 ± 1.2 Ma ago, during the earliest phase of Cretaceous magmatism on the island. The remanence structure is principally single-component having been acquired in a normal polarity field. The magnetization carrier is inferred to be titanomaghaemite, a product of extensive low-temperature oxidation of original Fe-Ti oxides. When viewed in the context of the African palaeomagnetic reference frame, the characteristic magnetization is consistent with a late Cretaceous-Early Tertiary age, i.e., some 40 million years younger than the emplacement age of the dykes. This low-temperature magnetic resetting is associated with reactivation of the fault/dyke system, this being the consequence of an early Tertiary shear régime provided by 25° anticlockwise rotation of an African/eastern Indian Ocean lithospheric block system. The overall remanence direction yields a pole at 65.5°S, 38°E (K = 73, α95 = 1.8), but this pole is regarded as providing only crude paleomagnetic information since the total palaeomagnetic record was most likely acquired at various times during the assumed lithospheric rotation." @default.
- W2043311502 created "2016-06-24" @default.
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- W2043311502 date "1992-08-01" @default.
- W2043311502 modified "2023-10-16" @default.
- W2043311502 title "The coast-parallel dolerite dykes of east Madagascar; age of intrusion, remagnetization and tectonic aspects" @default.
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- W2043311502 doi "https://doi.org/10.1016/0899-5362(92)90071-j" @default.
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