A Forward Model of Mantle Convection with Evolving Continents and a Model of the Andean Subduction Orogen
A Forward Model of Mantle Convection with Evolving Continents and a Model of the Andean Subduction Orogen
复制标题
大陆演化的地幔对流正演模型和安第斯俯冲造山带模型
DOI:
10.1007/978-3-642-33374-3_35
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发表时间:
2013
期刊:
影响因子:
--
通讯作者:
L. Viereck-Götte
中科院分区:
文献类型:
--
作者:
Walzer;R. Hendel;C. Köstler;M. M¨ller;J. Kley;L. Viereck-Götte
Some essential features of Andean orogenesis cannot be explainedonlyby a dynamicregionalmodel since there are essential influences across its vertical boundaries. A dynamic regional model of the Andes should be embedded in a 3-D spherical-shell model. Because of the energy distribution on the poloidal and toroidal parts of the creep velocity and because of geologically determined mass transport alongside the Andes, both models have to be three-dimensional. Furthermore, we developed a new viscosity profile of the mantle with very steep gradients at the lithospheric-asthenospheric boundary and at a depth of 410 and 660 km. Therefore, the challenges to the code Terra are now essentially larger. In the last 3 years we have resolved these problems in an international cooperation (see Sect. 2.2). Based on the new viscosity profile and on an improved Terra, we computed a new forward spherical-shell model (Walzer and Hendel, J Geophys Res submitted, 2012b). For this model, we derived also a new extended acoustic Grüneisen parameter, γax, new profiles of the thermal expansivity, α, and of the specific heat,cv, at constant volume as well as a solidus depending on both the pressure and the water abundance. These innovations are essential to incorporate a chemical-differentiation mechanism into the model. We arrived at rather realistic episodes of continental growth interrupted by magmatically quiet time spans distributed over the whole time axis. Nevertheless, the model shows a main magmatic event at the very beginning of the Earth’s evolution. Papers on the improvement of Terra (Köstler et al. Comput Geosci submitted, 2012; Müller and Köstler, Int J Numer Methods Eng submitted, 2012)have been written. We conceived a regional model of the Andean Sect. 3.2.1) with the same new viscosity profile. We want to investigate why there is flat-slab subduction in some segments of the Andes and why deformation of the crust and volcanism migrate eastward. The evolution of the abundances of incompatible elements indicate a cycle which was finished by a fast process, perhaps by a large-scale delamination of the lower plate, perhaps also by another type of delamination. In connection with another spherical-shell model (with prescribed plate boundaries), the regional model should numerically explain why a plateau-type orogen evolved at an oceanic-continental plate boundary.
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DOI:
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发表时间:
2002
期刊:
影响因子:
--
作者:
D. Hindle;J. Kley;E. Klosko;S. Stein;T. Dixon;E. Norabuena
通讯作者:
E. Norabuena
DOI:
--
发表时间:
2008
期刊:
影响因子:
--
作者:
U. Walzer;R. Hendel;J. Baumgardner
通讯作者:
J. Baumgardner
DOI:
--
发表时间:
2013
期刊:
影响因子:
--
作者:
E. Klosko;S. Stein;D. Hindle;J. Kley;E. Norabuena;T. Dixon;Mian Liu
通讯作者:
Mian Liu
DOI:
--
发表时间:
1999
期刊:
影响因子:
--
作者:
J. Kley
通讯作者:
J. Kley
影响因子:
4.2
作者:
C. R. Monaldi;J. Salfity;J. Kley
通讯作者:
C. R. Monaldi;J. Salfity;J. Kley