کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4733188 | 1640526 | 2013 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Grain-size-sensitive creep of plagioclase accompanied by solution-precipitation and mass transfer under mid-crustal conditions
ترجمه فارسی عنوان
خزش پلاژیوکلاز حساس به حساسیت به دانه همراه با رسوب محلول و انتقال جرم در شرایط اواسط پوسته
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کلمات کلیدی
رطوبت، بارش، تغییرات ترکیب مورفولوژی دانه، جهت گیری کریستالوگرافی، جابجایی عظیم،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
چکیده انگلیسی
We report here on a study of three deformed granitoids: two mylonites and an ultramylonite from the inner ductile shear zone of the Ryoke metamorphic belt, SW Japan. Monophase layers composed of quartz, plagioclase or K-feldspar are present in all samples. The plagioclase-rich layers consist of grains 6-10 μm in size, and sometimes include patchy K-feldspar and quartz, indicating solution-precipitation. In the mylonite, the fine-grained plagioclase is mainly An23-25 and, the composition of plagioclase porphyroclast is An21-39 without any significant maximum. The An compositions together with textural observations indicate that fine-grained plagioclase nucleated from solution with mass transfer during deformation. In the ultramylonite, fine-grained plagioclase is widely changed to be An15-37, indicating that the grain-size-reduction process includes fracturing of original plagioclase porphyroclasts in addition to the solution-precipitation process, which results in the composition concentrated around An30. In all samples, the crystallographic orientations of fine-grained plagioclases are almost random and do not correlate with neighbouring porphyroclasts. Grain-size-sensitive creep occurred during rock deformation subsequent to the process of solution-precipitation that involved mass transfer via fluids.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Structural Geology - Volume 51, June 2013, Pages 61-73
Journal: Journal of Structural Geology - Volume 51, June 2013, Pages 61-73
نویسندگان
Jun-ichi Fukuda, Takamoto Okudaira,