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An Outline of the Geology of the Juan Fernandez Archipelago

Published online by Cambridge University Press:  01 May 2009

P. E. Baker
P. E. Baker
Affiliation:
Department of Geology and Mineralogy, Parks Road, Oxford.
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Abstract

The Juan Fernandez Archipelago, located off the coast of Chile, comprises a group of three small, considerably eroded volcanic islands, probably of late Tertiary age. Traces of old craters or calderas have been recognized on Robinson Crusoe Island which is built mainly of basaltic lava flows, many of them picrite-basalts. Coarse-grained ejected blocks, in which olivine predominates, are fairly common on Robinson Crusoe and there are also a number of exposures of dolerite showing pronounced banding. The only acid rock reported from the group is a soda-trachyte from Alexander Selkirk Island. Pumice washed ashore on the islands during the past year is possibly from a submarine eruption near the South Sandwich Islands in 1962.

Information

Type
Articles
Information
Geological Magazine , Volume 104 , Issue 2 , April 1967 , pp. 110 - 115
Copyright
Copyright © Cambridge University Press 1967

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References

REFERENCES

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