کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9526967 | 1636978 | 2005 | 30 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of buoyancy and mechanical layering on collisional deformation of continental lithosphere: Results from physical modeling
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Effects of buoyancy and mechanical layering on collisional deformation of continental lithosphere: Results from physical modeling Effects of buoyancy and mechanical layering on collisional deformation of continental lithosphere: Results from physical modeling](/preview/png/9526967.png)
چکیده انگلیسی
We use two suites of lithospheric-scale physical experiments to investigate the manner in which deformation of the continental lithosphere is affected by both (1) variations of lithospheric density (quantified by the net buoyant mass per area in the lithospheric mantle layer, MB), and (2) the degree of coupling between the crust and lithospheric mantle (characterized by a modified Ampferer ratio, Am). The dynamics of the experiments can be characterized with a Rayleigh-Taylor type ratio, ÏCLM. Models with a positively buoyant lithospheric mantle layer (MB > 0 and ÏCLM > 0) result in distributed root formation and a wide deformation belt. In contrast, models with a negatively buoyant lithospheric mantle layer strongly coupled to the crust (MB < 0, 0 > ÏCLM > â â 0.2, and Am > â 10â 3) exhibit localized roots and narrow deformation belts. Syncollisional delamination of the model lithospheric mantle layer and a wide deformation belt is exhibited in models with negatively buoyant lithospheric mantle layers weakly coupled to the crust (MB < 0, ÏCLM < 0, and Am < â 10â 3). Syncollisional delamination of the continental lithosphere may initiate due to buoyancy contrasts within the continental plate, instead of resulting from wedging by the opposing plate. Rayleigh-Taylor instabilities dominate the style of deformation in models with a negatively buoyant lithospheric mantle layer strongly coupled to the crust and a slow convergence rate (MB < 0 and ÏCLM > â â 0.2). The degree of coupling (Am) between the model crust and lithospheric mantle plays a lesser role in both the style of lower-lithospheric deformation and the width of the crustal deformed zone with increasing density of the lithospheric mantle layer.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tectonophysics - Volume 403, Issues 1â4, 5 July 2005, Pages 193-222
Journal: Tectonophysics - Volume 403, Issues 1â4, 5 July 2005, Pages 193-222
نویسندگان
Vernon M. Moore, Bruno C. Vendeville, David V. Wiltschko,