کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4680845 1634939 2006 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Grain size sensitive deformation mechanisms in naturally deformed peridotites
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
پیش نمایش صفحه اول مقاله
Grain size sensitive deformation mechanisms in naturally deformed peridotites
چکیده انگلیسی

Microstructural analyses of peridotite mylonites from the oceanic lithosphere indicate that shear localization results from the combined effects of grain size reduction, grain boundary sliding and second phase pinning during deformation. The pinning effect, combined with experimental flow laws for olivine, suggests that a permanent transition from dislocation creep processes to diffusion creep occurs. This rheological transition provides a mechanism for long term weakening of the lithosphere for rocks deforming in the brittle–ductile regime. In addition, our results support the hypothesis that a transition to diffusion creep promotes the randomization of pre-existing lattice preferred orientations, which would reduce seismic anisotropy.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 248, Issues 1–2, 15 August 2006, Pages 438–450
نویسندگان
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