Madagascar Plate
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Madagascar Plate
The Madagascar block was once attached to the Gondwana supercontinent and later the Indo-Australian Plate.
Thermally-induced rifting in the Somali Basin and transform rifting along the Davie fracture zone began in the late Permian 225 million years ago, with Gondwana supercontinent beginning to break up in the mid-Jurassic (about 167 million years ago) when East Gondwana, comprising Antarctica, Madagascar, India, and Australia, began to separate from Africa; East Gondwana then began to separate about 115-120 million years ago when India began to move northward.[1] Between 84-95 million years ago rifting separated Seychelles/India from Madagascar.
Since its formation the Madagascar block has moved roughly in conjunction with Africa, and thus there are questions as to whether the Madagascar Plate should be still considered a separate plate at all.[2][3]
References
- ^ Plummer, P. S., and E. R. Belle (1995), Mesozoic tectono–stratigraphic evolution of the Seychelles microcontinent, Sedimentary Geology, 96, 73–91.
- ^ Timothy M. Kusky, Erkan Toraman, and Tsilavo Raharimahefa (2006). "The Great Rift Valley of Madagascar: An extension of the Africa–Somali diffusive plate boundary?". International Association for Gondwana Research Published by Elsevier B.V.. http://linkinghub.elsevier.com/retrieve/pii/S1342937X06002711.
- ^ Timothy M. Kusky, Erkan Toraman, Tsilavo Raharimahefa, Christine Rasoazanamparany (2010). "Active tectonics of the Alaotra–Ankay Graben System, Madagascar: Possible extension of Somalian–African diffusive plate boundary?". http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B7XNB-4YCG0BC-2&_user=10&_coverDate=02%2F12%2F2010&_rdoc=19&_fmt=high&_orig=browse&_srch=doc-info%28%23toc%2329694%239999%23999999999%2399999%23FLA%23display%23Articles%29&_cdi=29694&_sort=d&_docanchor=&_ct=41&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=0e121950fbfec4f2821abfd445ba46e3.
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