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Coarse-grained rocks of Ascension Island

Abstract:

The lavas and pyroclastics of Ascension Island contain a suite of coarse grained igneous blocks which range in composition from olivine-gabbro to peralkaline-granite paralleling, but extending beyond the compositional range of the volcanics. The lavas range from alkali-basalt through hawaiite, trachybasalt, trachyandesite and trachyte to comendite. True basalt is relatively rare and there is a scarcity of analyses with 57 < Si02 < 63 wt %.

No high pressure mineral assemblages a...

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Institution:
University of Oxford
Division:
MPLS
Role:
Author

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Role:
Supervisor
Role:
Supervisor
Role:
Supervisor
Role:
Supervisor
Publication date:
1982
Type of award:
DPhil
Level of award:
Doctoral
Awarding institution:
University of Oxford
Source identifiers:
602800654
Language:
English
Subjects:
UUID:
uuid:35be8567-3787-48b9-a985-50979064d89e
Local pid:
td:602800654
Deposit date:
2013-01-18

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