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Rheid

In geology, a rheid /ˈrɪd/ is a substance whose temperature is below its melting point and whose deformation by viscous flow during the time of observation is at least three orders of magnitude (1,000 ×) greater than the elastic deformation under the given conditions. A material is a rheid by virtue of the time of observation. The term, coined by S. Warren Carey in 1953, has the same Greek root as rheology, the science of viscoelasticity and nonlinear flow.

Types of rheids edit

Almost any type of rock can behave as a rheid under appropriate conditions of temperature and pressure. For example, the Earth's mantle undergoes convection over long time-scales. As the mantle supports the propagation of shear waves, it may be deduced that it is a solid and, therefore, behaving as a rheid when it undergoes said convection. Granite has a measured viscosity at standard temperature and pressure of about 4.5×1019 Pa·s [1] so it should be considered a rheid. Similarly halite, the mineral form of table salt, is a geological material that behaves as a rheid over relatively short time-periods. As salt is buried by other types of sediments, it will often flow laterally towards regions of less-confining stress. Through this mechanism, salt domes and other structures may form. In some areas, such as the Gulf of Mexico, these structures often serve as traps for petroleum and natural gas.

References edit

  1. ^ Kumagai, Naoichi; Sadao Sasajima; Hidebumi Ito (15 February 1978). "Long-term Creep of Rocks: Results with Large Specimens Obtained in about 20 Years and Those with Small Specimens in about 3 Years". Journal of the Society of Materials Science (Japan). Japan Energy Society. 27 (293): 157–161. doi:10.2472/jsms.27.155. from the original on 2017-03-03. Retrieved 2008-06-16.


rheid, rhea, like, birds, rheids, places, schleswig, holstein, germany, disambiguation, geology, rheid, substance, whose, temperature, below, melting, point, whose, deformation, viscous, flow, during, time, observation, least, three, orders, magnitude, greater. For rhea like birds rheids see Rheidae For places in Schleswig Holstein in Germany see Rheide disambiguation In geology a rheid ˈ r iː ɪ d is a substance whose temperature is below its melting point and whose deformation by viscous flow during the time of observation is at least three orders of magnitude 1 000 greater than the elastic deformation under the given conditions A material is a rheid by virtue of the time of observation The term coined by S Warren Carey in 1953 has the same Greek root as rheology the science of viscoelasticity and nonlinear flow Types of rheids editAlmost any type of rock can behave as a rheid under appropriate conditions of temperature and pressure For example the Earth s mantle undergoes convection over long time scales As the mantle supports the propagation of shear waves it may be deduced that it is a solid and therefore behaving as a rheid when it undergoes said convection Granite has a measured viscosity at standard temperature and pressure of about 4 5 1019 Pa s 1 so it should be considered a rheid Similarly halite the mineral form of table salt is a geological material that behaves as a rheid over relatively short time periods As salt is buried by other types of sediments it will often flow laterally towards regions of less confining stress Through this mechanism salt domes and other structures may form In some areas such as the Gulf of Mexico these structures often serve as traps for petroleum and natural gas References edit Kumagai Naoichi Sadao Sasajima Hidebumi Ito 15 February 1978 Long term Creep of Rocks Results with Large Specimens Obtained in about 20 Years and Those with Small Specimens in about 3 Years Journal of the Society of Materials Science Japan Japan Energy Society 27 293 157 161 doi 10 2472 jsms 27 155 Archived from the original on 2017 03 03 Retrieved 2008 06 16 nbsp This article about structural geology is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Rheid amp oldid 1166635674, wikipedia, wiki, book, books, library,

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