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Journal of the Geological Society; 2005; v. 162; issue.4; p. 579-582;
DOI: 10.1144/0016-764904-127
© 2005 Geological Society of London

Short Communication

Unusually large clastic dykes formed by elutriation of a poorly sorted, coarser-grained source

Pierre-Simon Ross & James D.L. White

Department of Geology, University of Otago, PO Box 56, Dunedin, New Zealand (e-mail: p_s_ross@hotmail.com)

Tuff dykes of unusual size invade coarser-grained volcaniclastic rocks of the Jurassic Mawson Formation at Coombs Hills and Allan Hills, Antarctica. We infer that the material for the largest dykes was elutriated from their host's matrix. To our knowledge, this mode of genesis has not been invoked before. In this volcanic setting elutriation was driven by magmatic heat, but the production of relatively finer-grained clastic dykes by elutriation of material from coarser ill-sorted sources may be significant in many settings.

Key Words: clastic dykes • elutriation • volcaniclastic rocks • fluidization




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The impact of 3D seismic data on the understanding of compaction, fluid flow and diagenesis in sedimentary basins
Journal of the Geological Society, 2007; 164: 881 - 893.
[Abstract] [Full Text] [PDF]