A Petrogenetic Model for the Origin of the Calc-alkaline suite of Grenada, Lesser Antilles

Basanitoid, alkal basalt, andesite and dacite compositions from Grenada, Lesser Antilles, show a differentation trend from nepheline-normative, through hypersthene-normative to quartz-normative. This unusual sequence, in which the liquids migrate through the low pressure thermal divide of olivine-cl...

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Bibliographic Details
Published in:Journal of petrology 1973-06, Vol.14 (2), p.327-337
Main Authors: CAWTHORN, R. GRANT, CURRAN, E. B., ARCULUS, R. J.
Format: Article
Language:English
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Summary:Basanitoid, alkal basalt, andesite and dacite compositions from Grenada, Lesser Antilles, show a differentation trend from nepheline-normative, through hypersthene-normative to quartz-normative. This unusual sequence, in which the liquids migrate through the low pressure thermal divide of olivine-clinopyroxene-plagioclase from critically undersaturated compositions, is interpreted from experimental and chemical data as the result of crystallization of amphibole under a hydrous pressure of several kilobars.
ISSN:0022-3530
1460-2415
DOI:10.1093/petrology/14.2.327