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| Titel |
Insight into collision zone dynamics from topography: numerical modelling results and observations |
| VerfasserIn |
A. D. Bottrill, J. Hunen, M. B. Allen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 3, no. 2 ; Nr. 3, no. 2 (2012-11-23), S.387-399 |
| Datensatznummer |
250000996
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| Publikation (Nr.) |
 copernicus.org/se-3-387-2012.pdf |
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| Zusammenfassung |
| Dynamic models of subduction and continental collision are used to predict
dynamic topography changes on the overriding plate. The modelling results
show a distinct evolution of topography on the overriding plate, during
subduction, continental collision and slab break-off. A prominent
topographic feature is a temporary (few Myrs) basin on the overriding plate
after initial collision. This "collisional mantle dynamic basin" (CMDB) is caused by slab steepening
drawing, material away from the base of the overriding plate. Also, during this initial collision phase, surface uplift
is predicted on the overriding plate between the suture zone and the CMDB,
due to the subduction of buoyant continental material and its isostatic
compensation. After slab detachment, redistribution of stresses and
underplating of the overriding plate cause the uplift to spread further into
the overriding plate. This topographic evolution fits the stratigraphy found
on the overriding plate of the Arabia-Eurasia collision zone in Iran and
south east Turkey. The sedimentary record from the overriding plate contains
Upper Oligocene-Lower Miocene marine carbonates deposited between
terrestrial clastic sedimentary rocks, in units such as the Qom Formation
and its lateral equivalents. This stratigraphy shows that during the Late
Oligocene–Early Miocene the surface of the overriding plate sank below sea
level before rising back above sea level, without major compressional
deformation recorded in the same area. Our modelled topography changes fit
well with this observed uplift and subsidence. |
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