Physical geography

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Physical geography

Post  kosovohp on Wed Nov 24, 2010 1:41 am

Magnetic anomalies identified in the vicinity of the archipelago indicates that the structures forming the islands date back 125-150 million years: the islands themselves date from 8 million (in the west) to 20 million years (in the east).[11]. The oldest exposed rocks occurred on Maio and northern peninsula of Santiago and are 128-131 million year old pillow lavas. The first stage of volcanism in the islands began in the early Miocene, and reached its peak at the end of this period, when the islands reached their maximum sizes. Historical volcanism (within human settlement) has been restricted to the island of Fogo.

The origin of the islands' volcanism has been attributed to a hotspot, associated with bathymetric swell that formed the Cape Verde Rise.[12] The Rise is one of the largest protuberances in the world's oceans, rising 2.2 kilometers in a semi-circular region of 1200 kmē, associated with a rise of the geoid and elevated surface heat flow.[11].

Though Cape Verde's islands are all volcanic in origin, they vary widely in terrain.[

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