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Melting glaciers, enough sand to bury London, and ancient ecosystem engineering
Date:3/19/2012

nowledge, this is the world's largest such sand body, large enough to bury Manhattan (60 square kilometers) under 160 m of sand, or the whole of London (1579 square kilometers) under 6 m of sand. This represents a new type of economically interesting reservoir. The sand vented to the seafloor when it was more than 500 m deep. Currently, the sand (1) covers an area of more than 260 square kilometers; (2) is up to 125 m thick; (3) wedges out, away from a central thick zone; and (4) is locally absent along irregular ditches, 20 km long and up to 50 m deep, which overlie feeders on the flanks of the mounds. High fluid pressure fractured the regional seal in the study area so that fluidized sand moved rapidly to the seafloor through fissures, mixed with seawater, and formed lateral gravity currents. These transported the sand up to 8 km away from the blow-out fissures and formed extruded sand sheets.


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Contact: Christa Stratton
cstratton@geosociety.org
Geological Society of America
Source:Eurekalert

Page: 1 2 3 4 5 6 7 8 9

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