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首页> 外文期刊>Journal of geodynamics >The present day rheology, stress field and deformation along the DSS profile FENNIA in the central Fennoscandian Shield
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The present day rheology, stress field and deformation along the DSS profile FENNIA in the central Fennoscandian Shield

机译：Fennoscandian Shield中部沿DSS剖面FENNIA的当今流变学，应力场和变形

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摘要

The calculation of the rheological structure in the deep seismic profile FENNIA in the central Fennoscandian Shield allows in addition the modelling of the present-day stress field and state of deformation. Seismic and surface heat flow data together with all other applicable information are used in the construction of the model. Derivation of the two-dimensional rheological structure requires the determination of the temperature field and the use of known rheological laws both for the brittle and the ductile mechanisms. The rheological model is furthermore subjected to compressional loading resulting in the structural model, which is solved as well as the thermal model by the finite-element method. Results show that rheologically weak crustal layers can be generated under suitable conditions in the central Fennoscandian Shield. These are more evident when assuming wet conditions for the upper and middle crust. Although these weak layers are found the application of the rheological structure to a model, where stress and deformation are derived does not generate intensive crustal deformation. In the stress field influence of the rheology is very small in the crustal part whereas in the mantle a clear effect is seen at the depth of 100km where plastic deformation begins. Uncertainties related to thermal modelling and how these affect rheological and structural modelling are also analysed in a quantitative form showing the importance of temperature in tectonic modelling.
机译：在Fennoscandian Shield中部深地震剖面FENNIA中的流变结构的计算还可以对当今的应力场和变形状态进行建模。地震和地表热流数据以及所有其他适用的信息都用于模型的构建。二维流变结构的推导需要确定温度场，并使用已知的流变定律来确定脆性和延性机理。流变模型还承受压缩载荷，从而形成结构模型，并通过有限元方法求解热模型。结果表明，在适当的条件下，在芬诺斯堪的纳河中央盾构中可以产生流变薄弱的地壳层。当假设上地壳和中地壳处于潮湿条件时，这些更为明显。尽管发现了这些薄弱的层，但将流变结构应用于模型（应力和变形派生于模型）不会产生强烈的地壳变形。在应力场中，流变学对地壳部分的影响很小，而在地幔中，在开始塑性变形的100 km深度处可以看到明显的影响。还以定量形式分析了与热建模有关的不确定性以及这些不确定性如何影响流变学和结构建模，显示了温度在构造建模中的重要性。

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