Formation of submarine lava channel textures : insights from laboratory simulations
Garry, W. Brent
Gregg, Tracy K. P.
Soule, Samuel A.
Fornari, Daniel J.
MetadataShow full item record
Laboratory simulations using polyethylene glycol (PEG) extruded at a constant rate and temperature into a tank with a uniform basal slope and filled with a cold sucrose solution generate channels that are defined by stationary levees and mobile flow interiors. These laboratory channels consistently display the following surface textures in the channel: smooth, folded, lineated, and chaotic. In the simulations, we can observe specific local conditions including flow rate, position within the channel, and time that combine to develop each texture. The textures in PEG flows form due to relative differences in shear forces between the PEG crust and the underlying liquid wax. Minimal shear forces form smooth crust, whereas folded crust forms when the shear is sufficiently high to cause ductile deformation. Brittle deformation of solid PEG creates a chaotic texture, and lineated crust results from shear forces along the channel-levee margin. We observe similar textures in submarine lava channels with sources at or near the Axial Summit Trough of the East Pacific Rise between 9° and 10°N. We mapped the surface textures of nine submarine lava channels using high-resolution digital images collected during camera tows. These textural maps, along with observations of the formation of similar features in analog flows, reveal important information about the mechanisms occurring across the channel during emplacement, including relative flow velocity and shear stress.
Author Posting. © American Geophysical Union, 2006. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 111 (2006): B03104, doi:10.1029/2005JB003796.
Suggested CitationJournal of Geophysical Research 111 (2006): B03104
Showing items related by title, author, creator and subject.
CTD observations in the Great South Channel during the South Channel Ocean Productivity Experiment, SCOPEX, May-June 1989 Limeburner, Richard; Beardsley, Robert C. (Woods Hole Oceanographic Institution, 1989-11)CTD and acoustic Doppler current profiler (ADCP) observations were made in the Great South Channel (GSC) off the New England coast during R/V Endeavor cruise EN196 May 18 to June 12, 1989 as part of the South Channel ...
Liberatore, Stephen P. (Woods Hole Oceanographic Institution, 1990-09)Ocean Acoustic Tomography data are significantly degraded if mooring motion is unknown. An autonomous instrument employing a solid state data logger designed to track and record mooring motion is described. Navigation ...
White, Brian L.; Nepf, Heidi M. (American Geophysical Union, 2008-01-08)This paper presents a method for predicting the distributions of velocity and shear stress in shallow channels with a boundary of emergent vegetation. Experiments in a laboratory channel with model vegetation show that the ...