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Blocks of Plutonic Aspect in a Basaltic Lava from Faial, Azores (1966)

Baker, M. Jane

Cambridge University Press

In: Geological Magazine. 1966; 103(1): 51-60. Published 1966 Feb 01. doi: 10.1017/s001675680005041x.

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Publication Date: 1966-02-01

Description: A number of coarse-grained blocks, consisting of forsteritic olivine, chrome-diopside, calcic plagioclase, and chromite in varying proportions, were found in an ankaramitic basalt on Faial. With one exception, the blocks show remarkably little alteration. There is no evidence of zoning in any of the minerals. Indications of strain are frequent. Dark scoriaceous material is often present along intercrystal boundaries and fractures. The textures and gradations in composition suggest that these blocks were formed by crystal accumulation.

Print ISSN: 0016-7568

Electronic ISSN: 1469-5081

Topics: Geosciences

Published by Cambridge University Press

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