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A note on the nosean phonolite of the Wolf Rock, Cornwall

Cecil Edgar Tilley
A note on the nosean phonolite of the Wolf Rock, Cornwall
Geological Magazine (1959) 96 (6): 503-504


In view of the use of the Wolf Rock nosean phonolite as a type example of a more sodic phonolite, based on an analysis in 1871, the rock has been reanalyzed and reexamined. The new analysis, spectrographic data, an analysis of the sanidine, and the norm are given. The new analysis shows lower SiO (sub 2) , Fe (sub 2) O (sub 3) , FeO, CaO, and Na (sub 2) O, but considerably higher K (sub 2) O, and the rock is now compared to phonolites from Colfax, New Mexico, and Bruex, Czechoslovakia. A mineral not hitherto recorded has been found to be present. It is rich in La, Y, and Zr and may be a member of the johnstrupite-mosandrite group.

ISSN: 0016-7568
EISSN: 1469-5081
Coden: GEMGA4
Serial Title: Geological Magazine
Serial Volume: 96
Serial Issue: 6
Title: A note on the nosean phonolite of the Wolf Rock, Cornwall
Author(s): Tilley, Cecil Edgar
Pages: 503-504
Published: 1959
Text Language: English
Publisher: Cambridge University Press, London, United Kingdom
Accession Number: 1959-005523
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
N49°43'00" - N50°49'60", W06°55'60" - W04°15'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States
Update Code: 1959
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