کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4693700 1636873 2010 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Three-dimensional numerical models of the influence of a buoyant oceanic plateau on subduction zones
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Three-dimensional numerical models of the influence of a buoyant oceanic plateau on subduction zones
چکیده انگلیسی

We have investigated potential effects on a subduction zone during oceanic plateau–trench collision, using three-dimensional numerical models. An oceanic plateau of varied density was embedded in the slab, which was pinned at one end. The plateaus strongly influenced the shape of the trench. For a plateau with a higher density, the trench retreat rate was reduced in the region surrounding the plateau, and the plateau subducted along with the slab. For lower density plateaus, the trench in the region of the plateau advanced, and the plateau compressed and resisted subduction, spreading laterally along the trench. With a weaker slab rheology, the arcuate shape of the trench towards the free end of the trench was enhanced. Beneath the most buoyant plateaus, a tear formed in the subducted portion of the slab, soon after the slab tip reached the top of the lower mantle. We compare the model results with a region in the northwest Pacific, where the Ogasawara Plateau meets the trench of the Izu–Bonin–Mariana subduction zone.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tectonophysics - Volume 483, Issues 1–2, 1 March 2010, Pages 71–79
نویسندگان
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