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Basalt Textures from the Southeastern Lower Galilee, Israel

Published online by Cambridge University Press:  01 May 2009

M. J. Oppenhein
M. J. Oppenhein
Affiliation:
Dept. of Geology, Hebrew University, Jerusalem.
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Abstract

Basalt groundmass textural nomenclature is reviewed and revised. The intergranular and ophitic extures are seen as end members of a series with steadily increasing grain-size, the international representative of which is here termed the “isogranular” texture. Undere intrusive conditions the series may be extended to include the poikilitic texture. Ophitic texture is regarded as an intergrowth;the term “sub-ophitic”s not suitable for basalts but may be retained for texturally isotropic rocks. When basalts cool hurriedly they will tend to develop an intergranular texture whereas extension of the crystallization period permits the formation of an ophitic texture. Cooling conditions will be determined by a combination of the effects of the volatile concentration and the flow characteristics, the latter partly depending on topography.

Type
Articles
Information
Geological Magazine , Volume 101 , Issue 6 , 30 December 1964 , pp. 548 - 557
Copyright
Copyright © Cambridge University Press 1964

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References

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