کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8914545 1640475 2017 18 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Experimental investigation of the brittle-viscous transition in mafic rocks - Interplay between fracturing, reaction, and viscous deformation
ترجمه فارسی عنوان
بررسی تجربی انتقال گذر شکننده و چسبنده در سنگ های مافیک - تعامل بین شکستگی، واکنش و تغییر شکل چسبندگی
کلمات کلیدی
آزمایشات تغییر شکل سنگ، انتقال تلخ و چسبنده، رطوبت باران، مرز دانه کشویی، ریاضی چند فاز،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
چکیده انگلیسی
Rock deformation experiments are performed on fault gouge fabricated from 'Maryland Diabase' rock powder to investigate the transition from dominant brittle to dominant viscous behaviour. At the imposed strain rates of γ˙=3·10−5−3·10−6 s−1, the transition is observed in the temperature range of (600 °C < T < 800 °C) at confining pressures of (0.5 GPa ≤ Pc ≤ 1.5 GPa). The transition thereby takes place by a switch from brittle fracturing and cataclastic flow to viscous dissolution-precipitation creep and grain boundary sliding. Mineral reactions and resulting grain size refinement by nucleation are observed to be critical processes for the switch to viscous deformation, i.e., grain size sensitive creep. In the transitional regime, the mechanical response of the sample is a mixed-mode between brittle and viscous rheology and microstructures associated with both brittle and viscous deformation are observed. As grain size reduction by reaction and nucleation is a time dependent process, the brittle-viscous transition is not only a function of T but to a large extent also of microstructural evolution.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Structural Geology - Volume 105, December 2017, Pages 62-79
نویسندگان
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