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The nature of jointing, Tasman Peninsula, southern Tasmania

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Leaman, DE (1999) The nature of jointing, Tasman Peninsula, southern Tasmania. Papers and Proceedings of the Royal Society of Tasmania, 133 (1). pp. 65-76. ISSN 0080-4703

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Abstract

Existing literature describing the joints in high dolerite cliffs and at the Tessellated Pavement on the Tasman Peninsula offers conflicting
views concerning their origin. Recent writers have preferred a tectonic origin. Although regional structures do affect both pavement and
cliffrocks, these are not pervasive at outcrop scale. The rock pillars of the high cliffs are true, thermally produced columns, and their nature
can be demonstrated by direct inspection of polygons. Polygon faces are not readily identified in collections of joint measurements, but
some common orientations have been united in cliff exposure to yield ragged lineaments. This yields the illusion of more recent tectonic
control, although many such orientations are clearly at least Jurassic in age. The apparently regular patterns of the pavements are regionally
variable, and joint continuity and orientation are complex functions of lithology, bed thickness and pre-stressing, with new joints forming
due to relaxation and weathering processes. Pavement joints are generally very recent although they too replicate much older structural
trends controlled by east-west shears. Pavement ornamentation provides fine examples of physical and chemical weathering processes.

Item Type: Article
Keywords: Royal Society of Tasmania, RST, Van Diemens Land, natural history, science, ecology, taxonomy, botany, zoology, geology, geography, papers & proceedings, Australia, UTAS Library
Journal or Publication Title: Papers and Proceedings of the Royal Society of Tasmania
Page Range: pp. 65-76
ISSN: 0080-4703
Collections: Royal Society Collection > Papers & Proceedings of the Royal Society of Tasmania
Additional Information:

Copyright Royal Society of Tasmania

Date Deposited: 22 May 2012 02:17
Last Modified: 18 Nov 2014 04:33
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