کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9525706 | 1349880 | 2005 | 21 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Inverting the Fennoscandian relaxation-time spectrum in terms of an axisymmetric viscosity distribution with a lithospheric root
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Inverting the Fennoscandian relaxation-time spectrum in terms of an axisymmetric viscosity distribution with a lithospheric root Inverting the Fennoscandian relaxation-time spectrum in terms of an axisymmetric viscosity distribution with a lithospheric root](/preview/png/9525706.png)
چکیده انگلیسی
The Fennoscandian relaxation-time spectrum is an observational data set representing post-glacial land uplift and employed in interpretations of glacial-isostatic adjustment. We invert this data set by adapting the spectral finite-element method, originally developed for a 3D self-gravitating spherical earth model [Martinec, Z., 2000. Spectral-finite element approach to three-dimensional viscoelastic relaxation in a spherical earth. Geophys. J. Int. 142, 117-142], to an axisymmetric viscosity distribution. The free parameters used in the inversion are either the central-lithosphere thickness (below the former Fennoscandian ice sheet) and the upper-mantle viscosity or the peripheral-lithosphere thickness and the peripheral-asthenosphere viscosity (surrounding the former Fennoscandian ice sheet). We demonstrate that a model featuring a central lithosphere with a thickness of 200âkm and a peripheral lithosphere with a thickness of 80âkm underlain by an asthenosphere satisfies the relaxation-time spectrum. We also show that the spectrum can be explained on the basis of a spherically symmetric model featuring a 100-km thick lithosphere, but no asthenosphere. Whereas this result is essentially consistent with previous interpretations of glacial-isostatic adjustment, the result obtained for the axisymmetric viscosity model also agrees with a large number of interpretations based on seismic, geomagnetic, thermal or rheological evidence for Fennoscandia.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Geodynamics - Volume 39, Issue 2, March 2005, Pages 143-163
Journal: Journal of Geodynamics - Volume 39, Issue 2, March 2005, Pages 143-163
نویسندگان
ZdenÄk Martinec, Detlef Wolf,