کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
4677423 1634801 2012 11 صفحه PDF سفارش دهید دانلود رایگان
عنوان انگلیسی مقاله ISI
The association of cone–sheets and radial dykes: Data from the Isle of Skye (UK), numerical modelling, and implications for shallow magma chambers
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موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
پیش نمایش صفحه اول مقاله
The association of cone–sheets and radial dykes: Data from the Isle of Skye (UK), numerical modelling, and implications for shallow magma chambers
چکیده انگلیسی

We present field data and numerical models that aid understanding of fundamental volcano-tectonic processes of inclined sheet and dyke propagation, and more in general of volcano internal growth, under a stress field resulting from the inflation of a shallow magma chamber. Structural field data from the classical Cuillins cone–sheet complex (Isle of Skye) show that sheets have a constant average dip angle (45°), with pure dilational or hybrid shear-dilational kinematics. Our elasto-plastic finite element models, which consider the total stress field including gravity, tectonics and magma overpressure, suggest that only in the case of an inflating oblate shallow magma chamber cone–sheets can be predicted. They do not develop with spherical or prolate magma chambers and/or under deflation. Radial dykes dominate beyond a critical distance of 1–1.2 diameters of the magma chamber, whilst cone–sheets are confined immediately above it. These results may be used to infer, from observations on the sheet and dyke pattern at surface, the geometry and tensional state of magma chambers under active volcanoes.


► Field data and numerical modelling of cone–sheets and dykes around an inflating shallow magma chamber.
► Cone–sheets on the Isle of Skye have a constant average dip angle of 45°.
► Finite element models indicate that only an inflating oblate magma chamber is consistent with the cone–sheets.
► Cone–sheets occur above the magma chamber and radial dykes appear beyond a distance of 1–1.2 magma-chamber diameters.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volumes 339–340, 15 July 2012, Pages 46–56
نویسندگان
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