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A mechanism forming silicic segregations from basaltic magma discovered in igneous rocks of Western Sicily

Published online by Cambridge University Press:  01 May 2009

G. Lucido
G. Lucido
Affiliation:
Istituto di Mineralogia, Petrografia e Geochimica della Università di Palermo, Via Archirafi 36, 90123 Palermo, Italy
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Abstract

Summary. Mechanisms forming silicic segregations from basaltic magmas are considered of primary importance when dealing with magmatic problems. However, the processes which give rise to silicic segregations from basaltic magmas are so far obscure. Fortunately, the discovery of spheroidal felsic masses in some basic rocks of Western Sicily throws light on this subject. To clarify the relationships between felsic and basic fractions particular attention has been paid to the interactions which occurred at their contact. Textural evidence indicates that the accretion mechanism of the Sicilian felsic segregations tends to obliterate the silicate liquid immiscibility effects and suggests that the formation of silicic segregations is a consequence of liquid unmixing phenomena.

Type
Articles
Information
Geological Magazine , Volume 120 , Issue 4 , July 1983 , pp. 321 - 329
Copyright
Copyright © Cambridge University Press 1983

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