(Article of periodic en Anglais - 2009)

Document title

On the origin of A-tents (pop-ups), sheet structures, and associated forms

Authors(s) and Affiliation(s)

TWIDALE C.R. (1) ; BOURNE J.A. (1) ;
(1) School of Earth and Environmental Sciences, Geology and Geophysics, Univ., Adelaide, AUSTRALIE


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


Article of periodic

published at : Progress in physical geography / ISSN 0309-1333 / CODEN PPGEEC

Editor : Sage Publications, London - ROYAUME-UNI (1977)

Millesime : 2009, vol. 33, no2 [pp. 147-162]

Bibliographic references : 2 p.

Collation : 9 fig., 1 tabl.



INIST-CNRS, Cote INIST : 14648 A

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1177/0309133309338660

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2009
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