Three-dimensional numerical thermal and rheological modelling in the central Fennoscandian Shield

被引:8
|
作者
Moisio, K. [1 ]
Kaikkonen, P. [1 ]
机构
[1] Univ Oulu, Dept Geophys, FIN-90014 Oulu, Finland
关键词
Fennoscandian Shield; lithosphere; 3-D finite-element modelling; thermal analysis; rheological strength;
D O I
10.1016/j.jog.2006.05.001
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
A three-dimensional model for the central Fennoscandian Shield was constructed for analysing the thermal, the rheological and the structural conditions in the lithosphere. The mesh covers a rectangular area in the southern Finland with horizontal dimensions of 500 km x 400 km and a depth extent of 100 km. Structural boundaries are derived from the several deep seismic soundings carried out in the area. Constructed model is first used in the calculation of the thermal and the rheological models and secondly in analysing the stress and the deformational conditions with the obtained rheology. Thermal and structural models are solved with the finite element method. The calculated surface HFD is between 40 and 48 mW m(-2) in the Proterozoic southern part and below 40 mW m-2 in the older and northern Archaean part of the model. The calculated rheological strength shows a layered structure with two individual theologically weak layers in the crust and strong layer in the upper part of the lower crust. The minimum brittle-ductile transition (BDT) depth is around 10 km in the southern part of the model while in the north and north-eastern parts the BDT depth is around 45-50 km. Comparison with the focal depth data shows that as most of the earthquakes occur no deeper than the depth of 10 km are they located in the brittle regime. Resulting stress conditions and possible regions of deformation after the model is subjected to pressure of 50 MPa reveals that the stress field is quite uniformly distributed in different crustal layers and that the elastic parameters control more die state of the stress than the applied rheological structure. In the upper crust, the stress intensity has values between 42 and 45 MPa whereas in the middle crust the values are around 50 MPa. Comparison of the 3-D model with earlier 2-D models shows that some differences in the results are to be expected. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:95 / 114
页数:20
相关论文
共 50 条
  • [31] Three-dimensional numerical modelling of discontinuous fibre composite architectures
    Luchoo, R.
    Harper, L. T.
    Warrior, N. A.
    Dodworth, A.
    PLASTICS RUBBER AND COMPOSITES, 2011, 40 (6-7) : 356 - 362
  • [32] Three-dimensional numerical modelling of falling rock protection barriers
    Gentilini, Cristina
    Govoni, Laura
    de Miranda, Stefano
    Gottardi, Guido
    Ubertini, Francesco
    COMPUTERS AND GEOTECHNICS, 2012, 44 : 58 - 72
  • [33] Three-dimensional numerical modelling of bed changes in a sand trap
    Olsen, NRB
    Kjellesvig, HM
    JOURNAL OF HYDRAULIC RESEARCH, 1999, 37 (02) : 189 - 198
  • [34] Three-dimensional numerical modelling of mass transport in curved channels
    Ye, J
    McCorquodale, JA
    CANADIAN JOURNAL OF CIVIL ENGINEERING, 1997, 24 (03) : 471 - 479
  • [35] A three-dimensional model of the Early Precambrian crust under the southeastern Fennoscandian Shield: Karelia craton and Belomorian tectonic province
    Mints, M.
    Suleimanov, A.
    Zamozhniaya, N.
    Stupak, V.
    TECTONOPHYSICS, 2009, 472 (1-4) : 323 - 339
  • [36] Three-dimensional numerical modeling of thermal stratification in cooling ponds
    Sinha, SK
    Holly, FM
    Dyer, M
    WATER RESOURCES ENGINEERING 98, VOLS 1 AND 2, 1998, : 1044 - 1049
  • [37] Three-dimensional Numerical Simulation of the Thermal Structure in a Deep Reservoir
    Li, Guangning
    Zhang, Chen
    Gao, Xueping
    PROCEEDINGS OF THE 35TH IAHR WORLD CONGRESS, VOLS I AND II, 2013, : 2288 - 2293
  • [38] Numerical simulation and study of three-dimensional thermal field emission
    Kai, Peng
    Da-Gang, Liu
    ACTA PHYSICA SINICA, 2012, 61 (12)
  • [39] Three-dimensional numerical study of long-term settlement induced in shield tunneling
    Jallow, Amadou
    Ou, Chang-Yu
    Lim, Aswin
    TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY, 2019, 88 : 221 - 236
  • [40] Three-dimensional geoelectric model of the Kirovograd ore area of the central part of the Ukrainian Shield
    Nikolaev, I.
    Burakhovich, T. K.
    Sheremet, E.
    GEOFIZICHESKIY ZHURNAL-GEOPHYSICAL JOURNAL, 2013, 35 (04): : 127 - 139