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Viscosity estimates of salt in the Hormuz and Namakdan salt diapirs, Persian Gulf

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Title Viscosity estimates of salt in the Hormuz and Namakdan salt diapirs, Persian Gulf
 
Creator MUKHERJEE, S
TALBOT, CJ
KOYI, HA
 
Subject fold-thrust belt
rock-salt
zagros mountains
marine terraces
uplift rates
iran
tectonics
extrusion
evolution
dynamics
hormuz diapir
namakdan diapir
salt diapir
viscosity
newtonian viscous fluid
 
Description The parabolic surface profiles of the Hormuz and Namakdan salt diapirs in the Persian Gulf suggest that they have been extruding with Newtonian viscous rheologies for the last 10(4) years. We derive velocity profiles for these diapirs, neglecting gravitational spreading and erosion/dissolution while assuming incompressible Newtonian rheology of the salt. Fitting known rates of extrusion at specific points in its elliptical cross-section, the dynamic viscosity of the salt of the Hormuz diapir is found to range between 10(18) and 10(21) Pa s. Approximating its sub-circular cross-section to a perfect circle, the range of viscosity of the salt of the Namakdan diapir is obtained as 10(17)-10(21) Pa s. These calculated viscosities fall within the range for naturally flowing salts elsewhere and for other salt diapirs but are broader than those for salts with Newtonian rheology deforming at room temperatures. The salts of the Hormuz and Namakdan diapirs are expected to exhibit a broader range of grain size, which matches the limited existing data.
 
Publisher CAMBRIDGE UNIV PRESS
 
Date 2011-07-19T11:14:27Z
2011-12-26T12:51:10Z
2011-12-27T05:37:38Z
2011-07-19T11:14:27Z
2011-12-26T12:51:10Z
2011-12-27T05:37:38Z
2010
 
Type Article
 
Identifier GEOLOGICAL MAGAZINE, 147(4), 497-507
0016-7568
http://dx.doi.org/10.1017/S001675680999077X
http://dspace.library.iitb.ac.in/xmlui/handle/10054/5279
http://hdl.handle.net/10054/5279
 
Language en