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首页> 外文期刊>Journal of geodynamics >Basement inheritance and salt structures in the SE Barents Sea: Insights from new potential field data
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Basement inheritance and salt structures in the SE Barents Sea: Insights from new potential field data

机译：东巴伦支海的地下遗传和盐结构：来自新的潜在田间数据的见解

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The tectonic evolution of the former 'grey zone' between Russia and Norway has so far remained poorly constrained due to a lack of geophysical data. In 2014, the Geological Survey of Norway (NGU) carried out a new state-of-the-art aeromagnetic survey (BASAR-14) in the southern part of the new Norwegian offshore territory. The new BASAR-14 survey completes and extends the pre-existing aeromagnetic compilation and mapping of the Norwegian Barents Sea. We present this new magnetic dataset and its interpretation combined with gravity and seismic data. Caledonian and Timanian structures, highlighted by the new potential field data, dominate the basement patterns and have exerted a strong influence on the structure and development of the overlying basins and basement highs. Clearly associated with NW-SE-oriented Timanian trends, the Tiddlybanken Basin represents an atypical sag basin that developed at the southern edge of the Fedynsky High. Quantitative modelling along 2D seismic transects was also carried out to constrain the structural and basement composition of the study area. The predominant NE-SW Mesozoic trend of the Nordkapp Basin represents a major crustal hinge zone between the Finnmark Platform, poorly affected by major crustal deformation, and the Bjarmeland Platform where Late Palaeozoic lifting controlled the widespread accumulation of salt deposits in Late Carboniferous Early Permian time. The entire structure and segmentation of the Nordkapp Basin have been influenced by the inherited basement configuration highlighted by the new aeromagnetic data. At present, quite a few large diapiric salt domes along the Nordkapp and Tiddlybanken basins are relatively shallow, locally reaching the seabed and thus show a clear bathymetric and magnetic signature. Both the Nordkapp and the Tiddlybanken basins appear to lie at the edge of a peculiar thick and rigid crustal feature that coincides with a highly magnetic region. The abrupt termination of the eastern Nordkapp Basin at the edge of this magnetic domain suggests the presence of an old and thick Precambrian continental block. This magnetic and rigid tectonic buffer controlled the Late Palaeozoic pre-salt and Mesozoic post-salt tectonic development of the southeastern Barents Sea.
机译：由于缺乏地球物理数据，迄今为止，俄罗斯和挪威之间的前“灰色地带”的构造演化仍然受限制。 2014年，挪威地质调查局（NGU）在挪威新近海领土的南部进行了最新的最新航空磁调查（BASAR-14）。新的BASAR-14勘测完成并扩展了挪威巴伦支海的先前航空磁性编辑和制图。我们介绍了这个新的磁数据集及其解释，并结合了重力和地震数据。新的潜在田间资料突显了喀里多尼亚和Timanian的结构，主导了地下室的格局，并对上覆盆地和地下室高点的结构和发展产生了重要影响。 Tiddlybanken盆地与NW-SE导向的Timanian趋势明显相关，代表了在Fedynsky High南部边缘发展的非典型下陷盆地。还进行了沿二维地震样带的定量建模，以约束研究区域的结构和地下室组成。诺德卡普盆地的主要NE-SW中生代趋势代表了受主要地壳变形影响不大的Finnmark平台和Bjarmeland平台之间的主要地壳铰链区，在该处，晚古生代抬升控制了晚石炭世早期二叠纪时期盐矿的广泛聚集。 。新航空磁数据突显了继承的地下室构造，影响了诺德卡普盆地的整个结构和分段。目前，Nordkapp和Tiddlybanken盆地沿岸有许多大型的二apiric盐穹顶相对较浅，局部到达海床，因此显示出清晰的测深和磁性特征。 Nordkapp盆地和Tiddlybanken盆地似乎都位于特殊的厚而硬的地壳特征的边缘，该特征与高磁区一致。东部诺德卡普盆地在该磁畴边缘的突然终止表明存在着古老而厚的前寒武纪大陆块。这种磁性和刚性的构造缓冲带控制着东南巴伦支海的晚古生代盐前和中生代盐后构造发育。

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