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Title:
Bedrock Fracture by Ice Segregation in Cold Regions
Authors:
Murton, Julian B.; Peterson, Rorik; Ozouf, Jean-Claude
Affiliation:
AA(Department of Geography, University of Sussex, Brighton BN1 9QJ, UK.), AB(Department of Mechanical Engineering, University of Alaska, Fairbanks, AK 99775, USA.), AC(Laboratoire Morphodynamique Continentale et Côtiere, UMR 6143 CNRS/Université de Caen, 14032 Caen Cedex, France.)
Publication:
Science, Volume 314, Issue 5802, pp. 1127-1129 (2006). (Sci Homepage)
Publication Date:
11/2006
Origin:
SCIENCE
Abstract Copyright:
(c) 2006: Science
DOI:
10.1126/science.1132127
Bibliographic Code:
2006Sci...314.1127M

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.
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