Gas filter-pressing origin for segregation vesicles in dykes

Author:

Sanders I. S.

Abstract

AbstractSegregation vesicles have been recognized in two plagiophyric dolerite dykes in northwestern Ireland. The vesicles are each outlined by a rim of tangentially arranged plagioclase, and filled to a variable extent by a fine-grained, crescent-shaped lining of fractionated residual melt. They closely resemble segregation vesicles reported from Atlantic ocean-floor basalts.It is suggested (1) that the vesicles began as CO2-rich bubbles released during decompression; (2) that these bubbles grew very little during crystallization, while H2O became concentrated in the residual melt; and (3) that exsolution and expansion of H2O-rich vapour forced interstitial residual melt through the rigid but permeable framework of crystals and into the existing CO2-rich bubble cavities.

Publisher

Cambridge University Press (CUP)

Subject

Geology

Reference19 articles.

1. The Tertiary igneous rocks of Skye;Harker;Memoirs of the Geological Survey of the United Kingdom,1904

2. A Model for Predicting the Volumes of Vesicles in Submarine Basalts

3. I.—On the Amygdaloids of the Tynemouth Dyke

4. Abyssal tholeiites from the Oceanographer Fracture Zone

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