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Geoelectric investigations into rock strength and sandstone moisture regimes: implications for the weathering and deterioration of San Rock Art in the Golden Gate Reserve, South Africa

Mol, Lisa ORCID: https://orcid.org/0000-0001-5272-3671 and Viles, Heather 2010. Geoelectric investigations into rock strength and sandstone moisture regimes: implications for the weathering and deterioration of San Rock Art in the Golden Gate Reserve, South Africa. Geomorphology 118 (3-4) , pp. 280-287. 10.1016/j.geomorph.2010.01.008

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Abstract

The Clarens sandstone in the Golden Gate Reserve, South Africa, is the canvas for a collection of San (Bushmen) Rock Art, dating from Neolithic times until as recently as 150years ago. This Rock Art is under threat from human interference but also, to a greater degree, from weathering processes on the rock surface. The dominant weathering processes occurring in the rock shelters which host the Rock Art are flaking and honeycombing. Two rock shelter sites in the Reserve have been investigated using electric resistivity tomography (ERT) and supportive methods for measuring surface moisture (Protimeter) and surface hardness (Equotip). These non-destructive techniques can be used in situ to assess the extent of weathering within a rock outcrop and are especially suited for investigations in sensitive areas such as Rock Art sites. Moisture movement has been mapped and related to the weathering processes observed on the surface. The aim of the study is to aid Rock Art conservation in the Golden Gate Reserve through a better understanding of the driving processes of surface weathering. The evidence shows that the extensive flaking and honeycombing found in the rock shelters is most likely caused by water pockets in the near-surface zone, which are replenished through internal moisture transport, driving the superficial weathering processes. These weathering processes pose a significant problem: Rock Art in the Golden Gate Reserve shows severe deterioration due to flaking. Conservation strategies should therefore take internal processes into account as much as their superficial expression.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Environmental Sciences
Subjects: G Geography. Anthropology. Recreation > GB Physical geography
Uncontrolled Keywords: Sandstone; Weathering; South Africa; Rock Art; Resistivity; Moisture
Publisher: Elsevier
ISSN: 0169-555X
Date of Acceptance: 2010
Last Modified: 28 Oct 2022 08:56
URI: https://orca.cardiff.ac.uk/id/eprint/72732

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