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Age and composition of the Amanay Seamount, Canary Islands

Ancochea Soto, Eumenio and Huertas Coronel, María José (2003) Age and composition of the Amanay Seamount, Canary Islands. Marine Geophysical researches, 24 . [161]-169. ISSN 0025-3235

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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 on Amanay Seamount. Based on textural features and the presence or absence
of kaersutite, two main types of olivine pyroxene basaltic rocks have been identified. The rocks are basanites with
high enrichment in the most incompatible elements, similar to that displayed by Ocean Island Basalts. Samples
from Amanay Seamount 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 older 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:9960
Deposited On:27 Jan 2010 14:57
Last Modified:01 Feb 2010 09:28

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