EFFECTS OF A TEMPERATURE-DEPENDENT RHEOLOGY ON LARGE-SCALE CONTINENTAL EXTENSION
The influence of a temperature-dependent rheology on large-scale continental extension is investigated using a thin viscous sheet model. Numerical calculations of such a thin sheet subjected to an extensional boundary condition show the following results: At short times following the beginning of ex...
| Những tác giả chính: | , |
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| Định dạng: | Journal article |
| Ngôn ngữ: | English |
| Được phát hành: |
1989
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| _version_ | 1826300984973852672 |
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| author | Sonder, L England, P |
| author_facet | Sonder, L England, P |
| author_sort | Sonder, L |
| collection | OXFORD |
| description | The influence of a temperature-dependent rheology on large-scale continental extension is investigated using a thin viscous sheet model. Numerical calculations of such a thin sheet subjected to an extensional boundary condition show the following results: At short times following the beginning of extension, deformation occurs with negligible change in temperature, so that only small changes in lithospheric strength occur due to attenuation of the lithosphere, and maximum rates of deformation are located close to the extensional boundary. However, after a certain time interval, thermal diffusion results in lowered temperatures in the lithosphere, strongly increasing lithospheric strength and slowing the rate of extension. This critical time depends principally on the Peclet number and is short compared with the thermal time constant of the lithosphere. The changes in strength cause the locus of high extensional strain rates to shift with time from regions of high strain to regions of low strain. Results of the calculations are compared with observations from the Aegean, where maximum extensional strains are found in the south, near Crete, but the largest present-day extensional strain rates occur about 300km further north. -from Authors |
| first_indexed | 2024-03-07T05:25:29Z |
| format | Journal article |
| id | oxford-uuid:e0676d87-5c28-43ff-80bf-68388355093a |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T05:25:29Z |
| publishDate | 1989 |
| record_format | dspace |
| spelling | oxford-uuid:e0676d87-5c28-43ff-80bf-68388355093a2022-03-27T09:46:57ZEFFECTS OF A TEMPERATURE-DEPENDENT RHEOLOGY ON LARGE-SCALE CONTINENTAL EXTENSIONJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:e0676d87-5c28-43ff-80bf-68388355093aEnglishSymplectic Elements at Oxford1989Sonder, LEngland, PThe influence of a temperature-dependent rheology on large-scale continental extension is investigated using a thin viscous sheet model. Numerical calculations of such a thin sheet subjected to an extensional boundary condition show the following results: At short times following the beginning of extension, deformation occurs with negligible change in temperature, so that only small changes in lithospheric strength occur due to attenuation of the lithosphere, and maximum rates of deformation are located close to the extensional boundary. However, after a certain time interval, thermal diffusion results in lowered temperatures in the lithosphere, strongly increasing lithospheric strength and slowing the rate of extension. This critical time depends principally on the Peclet number and is short compared with the thermal time constant of the lithosphere. The changes in strength cause the locus of high extensional strain rates to shift with time from regions of high strain to regions of low strain. Results of the calculations are compared with observations from the Aegean, where maximum extensional strains are found in the south, near Crete, but the largest present-day extensional strain rates occur about 300km further north. -from Authors |
| spellingShingle | Sonder, L England, P EFFECTS OF A TEMPERATURE-DEPENDENT RHEOLOGY ON LARGE-SCALE CONTINENTAL EXTENSION |
| title | EFFECTS OF A TEMPERATURE-DEPENDENT RHEOLOGY ON LARGE-SCALE CONTINENTAL EXTENSION |
| title_full | EFFECTS OF A TEMPERATURE-DEPENDENT RHEOLOGY ON LARGE-SCALE CONTINENTAL EXTENSION |
| title_fullStr | EFFECTS OF A TEMPERATURE-DEPENDENT RHEOLOGY ON LARGE-SCALE CONTINENTAL EXTENSION |
| title_full_unstemmed | EFFECTS OF A TEMPERATURE-DEPENDENT RHEOLOGY ON LARGE-SCALE CONTINENTAL EXTENSION |
| title_short | EFFECTS OF A TEMPERATURE-DEPENDENT RHEOLOGY ON LARGE-SCALE CONTINENTAL EXTENSION |
| title_sort | effects of a temperature dependent rheology on large scale continental extension |
| work_keys_str_mv | AT sonderl effectsofatemperaturedependentrheologyonlargescalecontinentalextension AT englandp effectsofatemperaturedependentrheologyonlargescalecontinentalextension |