Mount Desire Dyke

Mount Desire Dyke is designated place of geological significance. It is located 16 km (9.9 mi) north-east of Hawker in South Australia, on the edge of the Flinders Ranges. The dyke (or dike) is a rock structure where heat-softened igneous rock has intruded into cracks in folded Adelaidean sediments in the geological past.[1]

On the State Heritage Register the site is described as significant because "This site contains a number of features of considerable importance to research and debate concerning the nature and origin of the Mt Desire Dyke and other 'diapirs' of the Flinders Ranges, including: typical dolomitic breccia and a large limestone xenoclast of probable Willouran origin; sharp irregular and distinctive contacts with early Cambrian Parara and Wilkawillina Limestones, including a particularly important apophysis interpreted as an intrusive re-entrant; and significant brecciation in, and metamorphic incongruence between, the material of the dyke and the adjacent Cambrian limestones."[2]

References
  1. Morrison, Robert Sinclair. Igneous Intrusive Rocks of the Peake and Denison Ranges within the Adelaide Geosyncline. OCLC 220669511.
  2. "Mount Desire Dyke (designated place of geological significance)". SA Heritage Places Database Search. Government of South Australia. 30 March 1998. Retrieved 24 January 2020.


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