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Timing of hot spot-related volcanism and the breakup of Madagascar and India
journal contribution
posted on 2023-05-17, 08:50 authored by Storey, M, Mahoney, JJ, Saunders, AD, Duncan, RA, Kelley, SP, Mike CoffinMike CoffinWidespread basalts and rhyolites were erupted in Madagascar during the Late Cretaceous. These are considered to be related to the Marion hot spot and the breakup of Madagascar and Greater India. Seventeen argon-40/argon-39 age determinations reveal that volcanic rocks and dikes from the 1500-kilometer-long rifted eastern margin of Madagascar were emplaced rapidly (mean age = 87.6 ¡¾ 0.6 million years ago) and that the entire duration of Cretaceous volcanism on the island was no more than 6 million years. The evidence suggests that the thick lava pile at Volcan de l'Androy in the south of the island marks the focal point of the Marion hot spot at ¡88 million years ago and that this mantle plume was instrumental in causing continental breakup.
History
Publication title
ScienceVolume
267Issue
5199Pagination
852-855ISSN
0036-8075Department/School
Institute for Marine and Antarctic StudiesPublisher
Amer Assoc Advancement SciencePlace of publication
1200 New York Ave, Nw, Washington, USA, Dc, 20005Rights statement
Copyright © 1995 The American Association for the Advancement of ScienceRepository Status
- Restricted