Bedrock fracture by ice segregation in cold regions

Murton, Julian B, Peterson, Rorik and Ozouf, Jean-Claude (2006) Bedrock fracture by ice segregation in cold regions. Science, 314 (5802). pp. 1127-1129. ISSN 0036-8075

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Abstract

The volumetric expansion of freezing pore water is widely assumed to be a major cause of rock fracture in cold-humid regions. Data from experiments simulating natural freezing regimes indicate that bedrock fracture results instead from ice segregation. Fracture depth and timing are also numerically simulated by coupling heat and mass transfer with a fracture model. The depth and geometry of fractures match those in Arctic permafrost and ice-age weathering profiles. This agreement supports a conceptual model in which ice segregation in near-surface permafrost leads progressively to rock fracture and heave, whereas permafrost degradation leads episodically to melt of segregated ice and rock settlement.

Item Type: Article
Additional Information: Challenges the assertion that fracture of porous bedrock is due to expansion of freezing water, and reveals that fracture is caused by ice-lens growth. The research was funded by NERC, presented as a keynote address (2nd European Permafrost Conference) and accompanied by a perspective in Science.
Schools and Departments: School of Global Studies > Geography
Depositing User: Julian Murton
Date Deposited: 06 Feb 2012 15:20
Last Modified: 04 Apr 2012 11:14
URI: http://sro.sussex.ac.uk/id/eprint/11774
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