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Universal Shapes? Analysis of the Shape of Antarctic Tafoni

1
Department of Geography, University of Portsmouth, Buckingham Building, Lion Terrace, Portsmouth and Hampshire PO1 3HE, UK
2
Department of Geography, Rhodes University, Grahamstown 6139, South Africa
*
Author to whom correspondence should be addressed.
Geosciences 2019, 9(4), 154; https://doi.org/10.3390/geosciences9040154
Received: 11 February 2019 / Revised: 20 March 2019 / Accepted: 25 March 2019 / Published: 2 April 2019
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Abstract

Using dimensional data from over 700 tafoni in Antarctica, this paper identifies how the dimensionless ratios of width/length (W/L) and depth/length (D/L) vary with tafoni length. The analysis suggests that these ratios do tend to converge to values that are similar to those found for fragments produced by brittle fracture and fragmentation. Dividing the data into quintiles and deciles, it is possible to assess how tafoni size and shape change as tafoni length increases. Smaller tafoni do tend to have a rounder plan form which rapidly changes as tafoni length increases towards the W/L ratio of 0.67. It is suggested that initial tafoni development is limited by the conditions set out in a recent mathematical model of tafoni development. This model focuses on tafoni development through the interactions of variable rock strength and the varying concentration gradient of a corrosive agent. Erosion involves the removal of relatively small sections of rock and is analogous to a continuous erosional process. This model produces tafoni of relatively circular plan form. Above a certain tafoni length it is suggested that processes associated with brittle fracture begin to dominant the development and shape of tafoni. View Full-Text
Keywords: tafoni modelling; brittle fracture; fragmentation; ratios tafoni modelling; brittle fracture; fragmentation; ratios
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Inkpen, R.; Hall, K. Universal Shapes? Analysis of the Shape of Antarctic Tafoni. Geosciences 2019, 9, 154.

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