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Read e-book online A Photographic Atlas of Rock Breakdown Features in PDF

By Mary C. Bourke, Heather A. Viles (Eds.)

ISBN-10: 0978523601

ISBN-13: 9780978523602

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Conchoidal fractures are a special case of percussion fracture in which a cone-shaped stress wave passes through a rock resulting in the detachment of a flake from a core (Fig. F2). In rare instances, the detached flake will take the form of a cone known as a hertzian cone. But, conchoidal fractures do not always completely propagate, creating crescentic surface depressions known as incipient cones or ring cracks. If a conchoidal fracture fully propagates on the margin of a clast, a partial hertzian cone is formed and a flake is detached from the core (Fig.

Bourke. A. C. Alveoli on top of a weathered volcanic boulder in the Atacama Desert, Chile. Note large tafoni at base. Image courtesy of H. Viles. ____________________________________________________________________ A Photographic Atlas of Rock Breakdown Features in Geomorphic Environments, Edited by Mary Bourke & Heather Viles © 2007 Planetary Science Institute, Tucson. Chapter 4: Weathering Features Introduction Mechanical, chemical and biological weathering processes all leave a range of clear morphological signatures on boulder surfaces.

Their occurrence is restricted to soluble rocks within arid environments. They were first described by Lowdermilk and Woodruff (1932) who named them ‘rillensteine’. It is hypothesized that these features are produced through chemical weathering where water availability is low, thus only small features result. Often they are found on ventifacts. , Maxson, 1940). A whole suite of similar features can be observed which are miniature versions of the karren features found on soluble rocks under humid conditions.

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A Photographic Atlas of Rock Breakdown Features in Geomorphic Environments by Mary C. Bourke, Heather A. Viles (Eds.)


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