A good example of the rapid end of the spectrum would be the salt "surge" of the Sigsbee salt glacier in the central deepwater Gulf of Mexico, which has advanced by up to 25 km in the last 5 Ma, or an average geologic rate of 2.5 cm/yr. The rates in the GOM for an average location and an average time would almost always be below that rate. And since the local behavior at the front appears to be stick-slip over periods of a few million years, the shorter term slip rate during the slipping phase may be somewhat higher. Hope this helps.
Scot Krueger
-----Original Message-----
From: Tectonics & structural geology discussion list [mailto:[log in to unmask]] On Behalf Of Andrea Billi
Sent: Wednesday, January 11, 2012 5:09 AM
To: [log in to unmask]
Subject: help - velocity of salt tectonics
Dear All,
I was looking for typical ranges of velocities for sedimentary overburdens sliding over a salt layer along passive margins.
In models by Gemmer et alii (Basin Research 2004, 16, 199-218) and Albertz et alii (Tectonics 2010, 29, TC4017, doi:10.1029/2009TC002539) I see velocities between a few millimetres to a few centimeters per year, depending on various boundary conditions.
Do you know other natural or experimental data concerning these velocities?
Thanks a lot
Andrea
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Andrea Billi (PhD)
Consiglio Nazionale delle Ricerche, IGAG, c.o. Dipartimento Scienze della Terra, Sapienza Università di Roma, P.le A. Moro 5, 00185, Rome, Italy.
Phone: +39 06-49914955
Skype: a.billi
Email: [log in to unmask]
Web site: http://www.andreabilli.com
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