Physics
Scientific paper
Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978comp...66...15f&link_type=abstract
Contributions to Mineralogy and Petrology, Volume 66, Issue 1, pp.15-20
Physics
2
Scientific paper
A nepheline syenite inclusion found in an ignimbritic sequence from Tenerife has revealed a variety of minerals which indicate the strongly peralkaline nature of the rock. The major mineral, alkali feldspar, encloses earlier crystallized biotite, Mn-rich magnetite, sphene and perovskite. The late-crystallizing minerals in the interstices include clinopyroxene (aegirine-augite to titanian-aegirine), F-rich arfvedsonite, ramsayite, nepheline, pyrophanite, apatite, sodalite and rare F-rich eucolite and titan-låvenite. The data illustrate the important role of volatiles in the sub-volcanic equivalent of the phonolitic lavas.
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