کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5781758 1413898 2016 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Obliquity along plate boundaries
ترجمه فارسی عنوان
چارچوب در امتداد محدوده صفحات
کلمات کلیدی
تکتونیک انفجاری، رویکرد جهانی، فرمت چسبیده، همگرایی انحرافی،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی


- We review obliquity along plate boundaries.
- 3 parameters control the strain pattern at plate boundaries: obliquity, bulk strain and rheology.
- There is a threshold between stress reorientation and strain partitioning.
- Exhumation occurs at convergent plate boundaries along large-scale strike slip systems.
- At extensional boundaries, obliquity controls magma emplacement, enhancing continental rupture.

Most of the plate boundaries are activated obliquely with respect to the direction of far field stresses, as roughly only 8% of the plate boundaries total length shows a very low obliquity (ranging from 0 to 10°, sub-orthogonal to the plate displacement). The obliquity along plate boundaries is controlled by (i) lateral rheological variations within the lithosphere and (ii) consistency with the global plate circuit. Indeed, plate tectonics and magmatism drive rheological changes within the lithosphere and consequently influence strain localization. Geodynamical evolution controls large-scale mantle convection and plate formation, consumption, and re-organization, thus triggering plate kinematics variations, and the adjustment and re-orientation of far field stresses. These geological processes may thus result in plate boundaries that are not perpendicular but oblique to the direction of far field stresses. This paper reviews the global patterns of obliquity along plate boundaries. Using GPlate, we provide a statistical analysis of present-day obliquity along plate boundaries. Within this framework, by comparing natural examples and geological models, we discuss deformation patterns and kinematics recorded along oblique plate boundaries.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tectonophysics - Volume 693, Part B, 14 December 2016, Pages 171-182
نویسندگان
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