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Age and composition of the Amanay Seamount, Canary Islands

Ancochea Soto, Eumenio and Huertas Coronel, María José (2004) Age and composition of the Amanay Seamount, Canary Islands. Marine geophysical researches . pp. 1-9. ISSN 0025-3235 (Unpublished)

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Abstract

A number of samples have been dredged from the upper parts of Amanay and El Banquete Seamounts, yet volcanic
materials have been collected only in Amanay. Based on the textural features and the presence or absence of
kaersutite, two main types of olivine pyroxene basaltic rocks have been identified. From a compositional point
of view, they are basanites with high enrichment in the most incompatible elements, similar to that displayed by
Ocean Island Basalts. Samples from Amanay seamount would have been formed due to a low degree of melting
of an enriched mantle, very similar to that which probably caused the Miocene volcanic activity of Fuerteventura.
The age of Amanay volcanic rocks, 15.3 ± 0.4 and 13.1 ± 0.3 Ma, is similar to those of the old volcanic units
exposed in the nearby islands (Gran Canaria, Fuerteventura and Lanzarote). This proves the formation of a separate
submarine volcanic edifice coeval with the other edifices of the Eastern Canarian Volcanic Ridge. Volcanic activity
on the submarine edifice is thought to have ceased at about 13 Ma, simultaneous with the adjacent main volcanic
construction.

Item Type:Article
Uncontrolled Keywords:Amanay Seamount, Eastern Canarian Volcanic Ridge, Oceanic Island Basalts, K-Ar geochronology,Canary Islands
Subjects:Sciences > Geology > Petrology
ID Code:10238
Deposited On:02 Mar 2010 12:39
Last Modified:06 Feb 2014 08:40

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