Cretaceous Volcanics And The Marion Hot Spot

on the southern side of the island of Madagascar, the shallow-water Madagascar plateau extends 500 miles (800 km) south along the Marion hot spot track to Marion Island. The volcanics associated with this hot spot track correlate with the Late Cretaceous (90 Ma) volcanics abundant on the island, associated with the separation of Madagascar from the Seychelles and India. They become younger progressively to the south to zero-age volcanic on Marion Island. Madagascar was most likely flat and near sea level in the Late Cretaceous 90 million years ago, and may have been entirely covered by flood basalts from the large igneous province associated with the breakup of India, the Seychelles, and Madagascar. The flood basalts from different parts of the island had different sources, but still all formed between 92-84 Ma. In all of these cases, more than 80 million years has elapsed since Madagascar was influenced by the Marion plume. The active faulting, volcanism, and uplift are therefore not related to the passage of Madagascar over the Marion hot spot.

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