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3D Crustal Model of Western and Central Europe as a Basis for Modelling Mantle Structureстатья
Информация о цитировании статьи получена из
Web of Science
Дата последнего поиска статьи во внешних источниках: 4 мая 2020 г.
- Авторы: Tesauro Magdala, Kaban Mikhail K., Cloetingh Sierd A.P.L
- Сборник: NEW FRONTIERS IN INTEGRATED SOLID EARTH SCIENCES
- Серия: International Year of Planet Earth
- Год издания: 2010
- Место издания: GFZ, Helmholtz Ctr; Int Lithosphere Program; Netherlands Res Ctr Integrated Solid Earth Sci
- Первая страница: 39+
- DOI: 10.1007/978-90-481-2737-5\_2
- Аннотация: EuCRUST-07 is a new 3D model of the crust for western and central Europe. It offers a starting point in any kind of numerical modelling, which requires an a priori removal of the crustal effect. The digital model (35 degrees N, 71 degrees N; 25 degrees W, 35 degrees E) consists of three layers: sediments and two layers of the crystalline crust. The latter are characterized by average P-wave velocities (V-p), which were defined based on seismic data. The model was obtained by assembling together at uniform 15’x15’ grid available results of deep seismic reflection, refraction and receiver function studies. The Moho depth variations were reconstructed by merging the most robust and recent Moho depth maps existing for the European region and compiled using published interpretations of seismic profiles. EuCRUST-07 demonstrates large differences in Moho depth with previous compilations: over +/- 10 km in some specific areas (e.g., the Baltic Shield). The basement is outcropping in some part of eastern Europe, while in western Europe it is up to similar to 16 km deep, with an average value of 3-4 km, reflecting the presence of relatively shallow basins. The velocity structure of the crystalline crust turns out to be much more heterogeneous than demonstrated in previous compilations, having an average V-p varying from 6.0 to 6.9 km/s. In comparison to existing models, the new model shows average crustal velocity values distributed over a larger and continuous range. The sedimentary thickness appears underestimated by CRUST2.0 by similar to 10 km in several basins (e.g., the Porcupine basin), while it is overestimated by similar to 3-6 km along part of the coastline (e.g., the Norwegian coast). EuCRUST-07 shows a Moho 5-10 km deeper than previous models in the orogens (e.g., the Cantabrian Mountains) and in the areas where the presence of magmatic underplating increases anomalously the crustal thickness. EuCRUST-07 predicts a Moho shallower 10-20 km along parts of the Atlantic margin, and in the basin (e.g., the Tyrrhenian Sea), where previous models overestimate the average crustal velocity. Furthermore, the results of EuCRUST-07 are used to make inferences on the lithology for various parts of Europe. The new lithology map shows the eastern European tectonic provinces represented by a granite-felsic granulite upper crust and a mafic granulite lower crust. By contrast, the younger western European tectonic provinces are mostly characterized by an upper and lower crust of granite-gneiss and dioritic composition, respectively.
- Добавил в систему: Кабан Михаил Константинович