Abstract The outer Voring Basin, Norwegian Sea, is an abnormally deep and distal part of the Norwegian passive margin, known as “magma-rich”. Yet, the lastest borehole drilled in its northernmost part led to a drastic change in the interpretation of seismic reflection data. This update motivates a new model for the entire Mesozoic-Eocene rifting period. Here I evaluate the link between tectonics, serpentinization and magmatism in the Norwegian margin from the Ryazanian-Valanginian to the Palaeocene-Eocene magmatic breakup. Maps of the regional Nise sandstones and main regional unconformities specifically highlight the fundamental role of the Nyk-Vema Structure to understand the basin and to question the deformation timing related to deep structures. The top of partially serpentinized mantle is supported by high-amplitude reflectors clearly visible on certain seismic lines, known as “T-Reflector”, covered with gravity-driven pre-exhumation sediments and further deposits. A new structural scheme based on the interpretation of 2D and 3D seismic data shows the complex organization of fault networks and constrains a major deformation period between the Late Campanian and the Late Palaeocene. Ocean-scale complementary arguments are in good agreement with Lower-Cretaceous mantle exhumation. Before becoming a volcanic margin in the Palaeocene, this segment of the Norwegian margin appears as amagmatic until the Late Campanian, at least. I propose an integrated model since the onset of hyperextension in the end of the Jurassic until the cessation of activity of the Aegir Ridge in the Miocene. This model has implications regarding the context-dependent interpretation of lower-crustal bodies, the ubiquity of serpentinization and mantle exhumation worldwide, and on the hydrocarbon system.

中文翻译：

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从岩浆到火山边缘的转变：冰岛羽流影响之前沃林盆地的地幔剥脱

摘要 挪威海外沃林盆地是挪威被动边缘异常深的远端部分，被称为“富岩浆”。然而，在其最北端钻出的最后一个钻孔导致地震反射数据解释发生了巨大变化。此更新激发了整个中生代-始新世裂谷期的新模型。在这里，我评估了从梁赞阶-瓦兰吉阶到古新世-始新世岩浆破裂的挪威边缘的构造、蛇纹石化和岩浆作用之间的联系。区域尼塞砂岩和主要区域不整合面的地图特别突出了 Nyk-Vema 结构在了解盆地和质疑与深层结构相关的变形时间方面的基本作用。部分蛇纹石化地幔的顶部由在某些地震线上清晰可见的高振幅反射器支撑，称为“T 型反射器”，覆盖着重力驱动的预折返沉积物和其他沉积物。基于 2D 和 3D 地震数据解释的新构造方案显示了断层网络的复杂组织，并限制了晚坎帕阶和晚古新世之间的主要变形期。海洋尺度的互补论点与下白垩统地幔剥露非常吻合。在古新世成为火山边缘之前，至少在晚坎帕阶之前，这部分挪威边缘似乎是无岩浆的。我提出了一个综合模型，从侏罗纪末期超伸开始到中新世埃吉尔海脊活动停止。