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首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >Onshore-offshore potential field analysis of the M?re-Tr?ndelag Fault Complex and adjacent structures of Mid Norway
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Onshore-offshore potential field analysis of the M?re-Tr?ndelag Fault Complex and adjacent structures of Mid Norway

机译：挪威中部M？re-Tr？ndelag断层复合体及邻近构造的陆上-海上势场分析

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The M?re-Tr?ndelag Fault Complex (MTFC) is one of the most prominent fault complexes of Scandinavia. It exerted a strong control on the development of offshore basins of Mid Norway and onshore topography. However, the relationships between the faults observed in the field onshore and those identified by means of seismic profiling offshore remain obscure. Regional gravity and aeromagnetic data are used to map regional-scale faults and, in particular, to delineate the main geophysical features related to the MTFC. The advantage of potential field data is to provide an almost continuous coverage and to tie bedrock mapping onshore to seismic interpretation offshore. In this paper, we apply potential field transformations to focus on the regional and deep-seated structures in order to extract new geological information. Also the tilt derivative technique (TDR) is applied to gravity and magnetic data with the aim of enhancing linear trends. The results indicate the possible onshore-offshore links of large scale structural elements like the MTFC and late-Caledonian detachments (e.g. Kollstraumen Detachment). The locations of different segments of the MTFC are detected and possible new faults/lineaments are depicted. Correlating petrophysical data with gravity and magnetic maps explains the influence of the MTFC on the deformation and mineralisation of bedrock along its strike. In addition, the structural pattern seen in the enhanced lineaments is diagnostic for the sinistral strike-slip movements that are known to have occurred in Devonian time along the MTFC. This confirms the important role of the MTFC in the tectonic setting and geological evolution of Mid Norway.
机译：M？re-Tr？ndelag断层复合体（MTFC）是斯堪的纳维亚半岛最著名的断层复合体之一。它对挪威中部近海盆地和陆上地形的发展施加了强有力的控制。但是，在陆上现场观察到的断层与通过海上地震剖面识别出的断层之间的关系仍然不清楚。区域重力和航磁数据用于绘制区域尺度的断层图，尤其是描绘与MTFC有关的主要地球物理特征。潜在现场数据的优势在于可以提供几乎连续的覆盖范围，并将陆上的基岩测绘与海上的地震解释联系起来。在本文中，我们将潜在的场转换应用于区域和深层结构，以提取新的地质信息。倾斜导数技术（TDR）也应用于重力和磁数据，目的是增强线性趋势。结果表明，大型结构要素（如MTFC）和后期卡莱多尼亚支队（例如Kollstraumen支队）可能在岸上-近海之间建立了联系。检测到MTFC的不同段的位置，并描述可能的新故障/特征。岩石物理数据与重力图和磁图的相关性说明了MTFC对沿其走向的基岩变形和矿化的影响。此外，在增强后的线条中看到的结构模式可诊断出已知的泥盆纪沿MTFC发生的左旋走滑运动。这证实了MTFC在挪威中部的构造环境和地质演化中的重要作用。

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