A THIN VISCOUS SHEET MODEL FOR CONTINENTAL DEFORMATION
For the purposes of describing its large-scale and long-term deformation, the continental lithosphere is regarded as a continuum, obeying a Newtonian or a power law rheology. The flow of a thin sheet of power law material overlying an inviscid substrate is studied under the assumption that vertical...
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| Format: | Journal article |
| Language: | English |
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1982
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| _version_ | 1826275173989351424 |
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| author | England, P Mckenzie, D |
| author_facet | England, P Mckenzie, D |
| author_sort | England, P |
| collection | OXFORD |
| description | For the purposes of describing its large-scale and long-term deformation, the continental lithosphere is regarded as a continuum, obeying a Newtonian or a power law rheology. The flow of a thin sheet of power law material overlying an inviscid substrate is studied under the assumption that vertical gradients of the horizontal velocity are negligible. A numerical model is used to investigate the deformation of such a sheet under conditions approximating those of continent-continent collision. The material flows in response to forces applied to its boundaries and to forces in its interior arising from gradients in crustal thickness. The horizontal divergence of the flow produces changes in the crustal thickness and hence a time-dependent form to the flow itself. The results of the numerical experiments show that systems in which the effective viscosities are such that the maximum deviatoric stresses are between 1kbar and 100 bar have crustal thickness distributions comparable to that in the India-Asia collision zone. In addition, these systems have the characteristic that the forces arising from crustal thickness contrasts are great enough to produce net extension in the region of thick crust in front of the influx boundary, perpendicular to the direction of influx, as well as lateral movement away from the region of thickest crust. Observations of contemporary tectonics in Asia show phenomena very similar to these, in the active east-west extension of Tibet and the eastward motion of eastern Tibet.-Authors |
| first_indexed | 2024-03-06T22:54:41Z |
| format | Journal article |
| id | oxford-uuid:5ff5f6fe-7791-4268-bbac-0c0e113ab156 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T22:54:41Z |
| publishDate | 1982 |
| record_format | dspace |
| spelling | oxford-uuid:5ff5f6fe-7791-4268-bbac-0c0e113ab1562022-03-26T17:50:20ZA THIN VISCOUS SHEET MODEL FOR CONTINENTAL DEFORMATIONJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:5ff5f6fe-7791-4268-bbac-0c0e113ab156EnglishSymplectic Elements at Oxford1982England, PMckenzie, DFor the purposes of describing its large-scale and long-term deformation, the continental lithosphere is regarded as a continuum, obeying a Newtonian or a power law rheology. The flow of a thin sheet of power law material overlying an inviscid substrate is studied under the assumption that vertical gradients of the horizontal velocity are negligible. A numerical model is used to investigate the deformation of such a sheet under conditions approximating those of continent-continent collision. The material flows in response to forces applied to its boundaries and to forces in its interior arising from gradients in crustal thickness. The horizontal divergence of the flow produces changes in the crustal thickness and hence a time-dependent form to the flow itself. The results of the numerical experiments show that systems in which the effective viscosities are such that the maximum deviatoric stresses are between 1kbar and 100 bar have crustal thickness distributions comparable to that in the India-Asia collision zone. In addition, these systems have the characteristic that the forces arising from crustal thickness contrasts are great enough to produce net extension in the region of thick crust in front of the influx boundary, perpendicular to the direction of influx, as well as lateral movement away from the region of thickest crust. Observations of contemporary tectonics in Asia show phenomena very similar to these, in the active east-west extension of Tibet and the eastward motion of eastern Tibet.-Authors |
| spellingShingle | England, P Mckenzie, D A THIN VISCOUS SHEET MODEL FOR CONTINENTAL DEFORMATION |
| title | A THIN VISCOUS SHEET MODEL FOR CONTINENTAL DEFORMATION |
| title_full | A THIN VISCOUS SHEET MODEL FOR CONTINENTAL DEFORMATION |
| title_fullStr | A THIN VISCOUS SHEET MODEL FOR CONTINENTAL DEFORMATION |
| title_full_unstemmed | A THIN VISCOUS SHEET MODEL FOR CONTINENTAL DEFORMATION |
| title_short | A THIN VISCOUS SHEET MODEL FOR CONTINENTAL DEFORMATION |
| title_sort | thin viscous sheet model for continental deformation |
| work_keys_str_mv | AT englandp athinviscoussheetmodelforcontinentaldeformation AT mckenzied athinviscoussheetmodelforcontinentaldeformation AT englandp thinviscoussheetmodelforcontinentaldeformation AT mckenzied thinviscoussheetmodelforcontinentaldeformation |