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The microtexture of analcime phenocrysts in igneous rocks

Andrew Putnis, Christine Putnis and Ciriaco Giampaolo
The microtexture of analcime phenocrysts in igneous rocks
European Journal of Mineralogy (October 1994) 6 (5): 627-632


Analcite which has been produced from leucite by ion-exchange processes has a characteristic microporous texture when observed by SEM, and is seen to be composed of an aggregate of sub-mu m crystals, whereas analcite crystallized from a fluid phase in hydrothermal veins has a well developed crystalline structure. SEM observations of analcite phenocrysts on broken surfaces of volcanic rocks from Sardinia show a microtexture very similar to that in analcite known to be ion-exchanged. Analcite phenocrysts from a lamproite from Jumilla, Spain, show a similar porous microtexture as well as direct evidence of leucite ->> analcite transformation. This suggests strongly that the analcite phenocrysts in the Sardinian volcanic rocks are secondary.

ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 6
Serial Issue: 5
Title: The microtexture of analcime phenocrysts in igneous rocks
Affiliation: University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom
Pages: 627-632
Published: 199410
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 16
Accession Number: 1994-054191
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: III Universita degli Studi di Roma, ITA, Italy
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199424
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