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The Role of Cooling Cracks Formed at High Temperatures and of Released Gas in the Formation of Chilled Basic Margins in Net-veined Intrusions

Published online by Cambridge University Press:  01 May 2009

B. Windley
B. Windley
Affiliation:
Grønlands Geologiske Undersøgelse, Østenoldgade 7, Copenhagen, Denmark.
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Abstract

Cooling cracks form at high temperatures when a basic magma is either viscous or crystalline and hot. It is postulated that fine-grained margins form along the fractures by release of gas through the fracture network. This takes place (a) by raising the liquidus-solidus boundary due to release of volatiles, (b) by expansion of the released gas with consequent cooling. Granitic material introduced along the fractures post-dates and may recrystallize the “chilled” margins.

Type
Articles
Information
Geological Magazine , Volume 102 , Issue 6 , December 1965 , pp. 521 - 530
Copyright
Copyright © Cambridge University Press 1965

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