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Basaltic volcanism in south-east Terceira, Azores

Published online by Cambridge University Press:  01 May 2009

M. S. Rosenbaum
M. S. Rosenbaum
Affiliation:
Department of Geology, Imperial College, Prince Consort Road, London S.W. 7
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Summary

The Terceira Rift is a subsidiary zone of crustal generation in the Azores to the E of the Mid-Atlantic Ridge. The geology of the island of Terceira, which straddles the rift, is thought to give an indication of the nature of the volcanic activity along this zone of crustal separation. Terceira is composed of 4 large strato-volcanoes associated with trachytic or trachybasaltic activity which have since been intruded by basaltic magmas to form monogenic cinder cones and lava flows on the flanks of these large volcanoes. There is little direct evidence of eruptions along fissures although lines of cinder cones may indicate zones of weakness in the crust.

Type
Articles
Information
Geological Magazine , Volume 111 , Issue 5 , September 1974 , pp. 409 - 420
Copyright
Copyright © Cambridge University Press 1974

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References

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