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Bounds on global dynamic topography from Phanerozoic flooding of continental platforms

Gurnis, Michael (1990) Bounds on global dynamic topography from Phanerozoic flooding of continental platforms. Nature, 344 (6268). pp. 754-756. ISSN 0028-0836. http://resolver.caltech.edu/CaltechAUTHORS:20130222-083005766

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Abstract

The movement of continents with respect to a large-scale pattern of dynamic topography and geoid, imposed by convection in the mantle, must contribute to the flooding of continental platforms. Here I investigate this phenomenon, using a one-dimensional model in which a continent moves from a high to a low of dynamic topography (and geoid), and in the process is partially exposed and then flooded. If the dynamic topography is greater than about 150 metres, the model continent is flooded by more than 3 0%—the maximum amount of flooding experienced by North America during the entire Phanerozoic eon1. The model suggests that a large-scale pattern of dynamic topography must have an amplitude of less than 150 metres, and that the admittance, the ratio of geoid to dynamic topography, may be greater than 0.3. Recent models of global mantle dynamics 2,3 which predict the long-wavelength geoid from mantle seismic structure are apparently inconsistent with Phanerozoic flooding.


Item Type:Article
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URLURL TypeDescription
http://dx.doi.org/10.1038/344754a0 DOIUNSPECIFIED
http://www.nature.com/nature/journal/v344/n6268/abs/344754a0.htmlPublisherUNSPECIFIED
Additional Information:© 1990 Nature Publishing Group. Received 13 October 1989; accepted 23 February 1990. This work was funded by a NSF Presidential Young Investigator Award. H. Pollack. M. Richards and B. Wilkinson provided helpful comments.
Group:Seismological Laboratory
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NSF Presidential Young Investigator AwardUNSPECIFIED
Record Number:CaltechAUTHORS:20130222-083005766
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20130222-083005766
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37064
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:22 Feb 2013 23:40
Last Modified:11 Jun 2015 12:59

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