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

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 invo...

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Bibliographic Details
Published in:Journal of the Geological Society
Main Authors: Ross, Pierre-Simon, White, James D. L.
Format: Article in Journal/Newspaper
Language:English
Published: 2005
Subjects:
digues clastiques
élutriation
roches volcanoctastiques
fluidisation
Allan Hills
Coombs Hills
Antarc*
Antarctica
Online Access:https://espace.inrs.ca/id/eprint/1908/
https://espace.inrs.ca/id/eprint/1908/1/Ross-White%28clastic-dikes%292005-web%5B2%5D.pdf
https://doi.org/10.1144/0016-764904-127
Description
Summary: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.

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