کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8914381 1640467 2018 54 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Evolution of shear zones through the brittle-ductile transition: The Calamita Schists (Elba Island, Italy)
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
Evolution of shear zones through the brittle-ductile transition: The Calamita Schists (Elba Island, Italy)
چکیده انگلیسی
Localization of deformation on shear bands was driven by temperature decrease that triggered strain partitioning between 'hard' high grade relics and 'soft' shear bands. Softening of shear bands occurred likely due to fluid influx and retrograde growth of fine-grained phyllosilicates. The interconnection of anastomosing shear bands and passive rotation of the relic high grade foliation caused widening of the shear bands producing mylonites with a composite mylonitic foliation and C′ shear bands. An estimate of the vorticity number Wk of the flow of ∼0.3-0.5 was obtained from the orientation of C′ shear bands measured at the meso- and thin section-scale. Close to the brittle-ductile transition, the growth of soft phyllosilicates allowed C′ shear bands to act as precursory structures to brittle deformation localized into an array of low-angle faults and shear fractures.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Structural Geology - Volume 113, August 2018, Pages 100-114
نویسندگان
, , ,