کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5779556 1634678 2017 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Insight into NE Tibetan Plateau expansion from crustal and upper mantle anisotropy revealed by shear-wave splitting
ترجمه فارسی عنوان
بازنگری در گسترش فلات تیتانیوم خلیج فارس از آنی استروپانیک گدازه پوسته پوسته و فوقانی نشان داده شده توسط تقسیم موج برشی
کلمات کلیدی
چین آرری، تبت پلاتو، تقسیم موج برشی، بی نظمی لرزه ای، زیرزمین لیتوسفر، جریان کانال پوسته / جداسازی،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
چکیده انگلیسی
The northeastern Tibetan plateau margin is the current expansion border, where growth of the plateau is ongoing. We analyze shear-wave splitting at ChinArray stations in the NE Tibetan Plateau and its margin with the stable North Chine Craton. The measurements provide important information on the seismic anisotropy and deformations patterns in the crust and upper mantle, which can be used to constrain the expansion mechanism of the plateau. Along the margin and within the craton, the dominant NW-SE fast polarization direction (FPD) is NW-SE, subparallel to the boundary between the plateau and the North China Craton. The shear-wave splitting measurements on the NE Tibetan Plateau itself generally reflect two-layer anisotropy. The lower-layer anisotropy (with NW-SE FPDs) is consistent in the whole region and FPDs are the same as those in the North China Craton. The upper-layer FPDs are parallel to crustal motion rather than surface structures within the high plateau. The two-layer anisotropy implies the presence of deformed Tibetan lithosphere above the underthrusting North China Craton. The NE Tibetan shows similar deformation patterns at the surface (inferred from GPS) and within the mantle (inferred from shear-wave splitting), but significant crustal anisotropy (parallel to crustal motion) requires mid-lower crustal channel flow or detachment to drive further tectonic uplift of the plateau.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 478, 15 November 2017, Pages 66-75
نویسندگان
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