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Type: Journal article
Title: On the origin of A-tents (pop-ups), sheet structures, and associated forms
Author: Twidale, C.
Bourne, J.
Citation: Progress in Physical Geography: an international review of geographical work in the natural and environmental sciences, 2009; 33(2):147-162
Publisher: Arnold
Issue Date: 2009
ISSN: 0309-1333
Abstract: A-tents are also known as pop-ups and by several other local names. They consist of raised slabs or plates of various thicknesses and origins. Laminae are caused by weathering, and spall plates or slabs may be caused in part by freeze-thaw acting on water held in pre-existing partings which are, however, like the sheet fractures that define the thicker sheet structures, probably of tectonic origin. A-tents are the result of the buckling of such laminae, plates and slabs. Again, tectonism in the form of compressive horizontal stress, appears the most likely and common causation, though decreases in lithostatic pressure consequent on unloading and, in particular cases, surficial expansion of plates caused by the intense heat of fires, may also contribute to rock failure and rupture. All A-tents are of Holocene age and are, therefore, neotectonic forms. Some have developed in living memory, and some are known to be developing from blisters. There is some evidence of continued dislocation along sheet fractures and of the transformation of blisters or arches into A-tents under the influence of continued lateral compression. This review demonstrates, therefore, that A-tents, sheet structures, and associated forms share a common heritage.
Keywords: A-tent
sheet fracture
Description: Copyright © 2009 by SAGE Publications
DOI: 10.1177/0309133309338660
Appears in Collections:Aurora harvest
Earth and Environmental Sciences publications

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