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Thesis

Petrogenesis of the phonolitic rocks of the Velay oriental, France

Abstract:

The Velay oriental (Massif Central, France) is a basaltic plateau with abundant viscous phonolite extrusions. The plateau lavas grade from alkali basalt to mugearite, but intermediate compositions are volumetrically scarce. Pyroclastics are absent. The most complete plateau sections are in the south, while in the north intermediate lavas appear only as viscous, phenocryst-rich extrusions.

The plateau lavas were erupted between 11.7Ma and 7.6Ma, the southern phonolites 8.5Ma- 6.5Ma an...

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Institution:
University of Oxford
Division:
MPLS
Department:
Earth Sciences
Oxford college:
St Edmund Hall
Role:
Author

Contributors

Division:
MPLS
Department:
Earth Sciences
Role:
Supervisor
Publication date:
1991
Type of award:
DPhil
Level of award:
Doctoral
Awarding institution:
University of Oxford
Language:
English
Keywords:
Subjects:
UUID:
uuid:1d8c0fe8-9f9e-4348-9c4c-21174aa56e70
Local pid:
ora:12057
Deposit date:
2015-07-31

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