Late Carboniferous-Permian tectonics and magmatic activity in the Skagerrak, Kattegat and the North Sea
Late Carboniferous-Permian tectonics and magmatic activity in the Skagerrak, Kattegat and the North Sea
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斯卡格拉克、卡特加特和北海的晚石炭世-二叠纪构造和岩浆活动
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发表时间：
2004
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通讯作者：
J. Faleide
中科院分区：
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作者：
Michel Heeremans;J. Faleide
摘要本研究的重点是在欧洲西北部，特别是在斯卡格拉克，卡特加特海峡和北海地区的晚石炭世-二叠纪构造和相关的岩浆活动。特别注意的是有关裂谷扳手的几何形状的侵入岩和喷出岩的分布。已经收集和分析了一个由地震和钻井数据组成的大型数据库，以限制这些目标。奥斯陆地堑延伸到斯卡格拉克是本区域研究的起点。利用地震和势场数据的综合分析绘制了裂谷结构（具有特征性的半地堑几何形状）和岩浆岩（侵入岩和喷出岩）的分布图。为了分析Sorgenfrei-Tornquist区和北海，使用了地震和钻井数据。在斯卡格拉克的裂谷结构可以与Sorgenfrei-Tornquist区的伸展结构，其中类似的故障几何形状已被观察到。在斯卡格拉克和卡特加特，熔岩序列的喷发通常与下古生界地层平行。因此，这一火山事件早于主要断层运动和充满二叠纪火山碎屑物质的半地堑的发育。在卡特加特海峡、日德兰半岛和北海（霍恩地堑和中央地堑）的威尔斯井中也发现了上石炭统-下二叠统的喷出物和侵入物。特别是在后一个地区，密集的地震和钻井覆盖范围使我们能够绘制出类似的上古生界几何形状，尽管盐的存在往往掩盖了下伏地层和构造的地震图像。根据研究结果，可以认为挪威-丹麦盆地大部分地区以下的前侏罗纪构造和向北进入霍尔达台地上的Stord盆地的前侏罗纪构造属于同一构造体系。
Abstract This study focuses on Late Carboniferous-Permian tectonics and related magmatic activity in NW Europe, and specifically in the Skagerrak, Kattegat and North Sea areas. Special attention is paid to the distribution of intrusives and extrusives in relation to rift-wrench geometries. A large database consisting of seismic and well data has been assembled and analysed to constrain these objectives. The continuation of the Oslo Graben into the Skagerrak has been a starting point for this regional study. Rift structures (with characteristic half-graben geometries) and the distribution of magmatic rocks (intrusives and extrusives) were mapped using integrated analyses of seismic and potential field data. For the analysis of the Sorgenfrei-Tornquist Zone and the North Sea, seismic and well data were used. The rift structures in the Skagerrak can be linked with extensional structures in the Sorgenfrei-Tornquist Zone in which similar fault geometries have been observed. Both in the Skagerrak and in the Kattegat, lava sequences were erupted that generally parallel the underlying Lower Palaeozoic strata. This volcanic episode, therefore, pre-dates main fault movements and the development of half-grabens filled with Permian volcaniclastic material. Upper Carboniferous-Lower Permian extrusives and intrusives have also been found in wells in the Kattegat, Jutland and the North Sea (Horn and Central grabens). Especially in the latter area, the dense seismic and well coverage has allowed us to map out similar Upper Palaeozoic geometries, although the presence of salt often conceals the seismic image of the underlying strata and structures. From the results, it is assumed that the pre-Jurassic structures below large parts of the Norwegian-Danish Basin and northwards into the Stord Basin on the Horda Platform belong to the same tectonic system.