Abstract The More and Voring basins of the mid-Norwegian volcanic passive margin are characterized by thick accumulations of Cretaceous to Paleocene sedimentary strata. They were formed during a series of Late Mesozoic-Early Cenozoic extensional events and represent vast underexplored areas with a limited number of wells. Recently, a new generation of long-offset 2D seismic reflection lines and 3D seismic data, together with new well data, has permitted a significant improvement in the regional understanding of the More and Voring basins. This has enabled much better imaging of the deep Cretaceous subbasins and sub-basalt structures. In light of this significant data improvement, we performed a regional tectonostratigraphic synthesis of the pre-breakup development of the More and Voring basins. We have interpreted eight regional Cretaceous and Paleocene horizons and constructed a series of structural and thickness maps. The new interpretations allow us to examine the sequential evolution of the Cretaceous to Paleocene sedimentary infill and to discuss its relationship to the deep crustal structures and regional tectonic events. We conclude that the long and polyphased development of the More and Voring basins is partly controlled by deep-seated structural highs. We show that active deposition in the Early Cretaceous was mainly focused in the More Basin, while the main Cenomanian and subsequent Late Cretaceous-Paleocene depocentres developed principally in the Voring Basin and migrated sequentially west towards the present continent-ocean boundary. We argue that the outer More and Voring basins are likely underlain by a relatively thick continental crust compared to the inner part of the regional sag basin. In this setting our observations do not support evidence for a large zone of exhumed upper mantle, which has previously been proposed to have formed before magmatism and breakup.

中文翻译：

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中挪威火山被动边缘区域结构及多相白垩纪-古新世裂谷及盆地发育

摘要 挪威中部火山被动边缘的More和Voring盆地以白垩纪至古新世沉积地层厚堆积为特征。它们是在一系列晚中生代-早新生代伸展事件期间形成的，代表了大量未勘探区域，但井数量有限。最近，新一代长偏移距 2D 地震反射线和 3D 地震数据，连同新的井数据，显着提高了对 More 和 Voring 盆地的区域认识。这使得对白垩纪深部盆地和亚玄武岩结构进行更好的成像成为可能。鉴于这一显着的数据改进，我们对 More 和 Voring 盆地的破碎前发育进行了区域构造地层综合。我们解释了八个区域性白垩纪和古新世层位，并构建了一系列构造和厚度图。新的解释使我们能够检查白垩纪到古新世沉积充填的顺序演化，并讨论其与深部地壳结构和区域构造事件的关系。我们得出结论，More 和 Voring 盆地的长期和多相发展部分受深部构造高位控制。我们表明早白垩世的活跃沉积主要集中在莫尔盆地，而主要的森诺曼阶和随后的晚白垩世 - 古新世沉积中心主要在沃林盆地发育，并依次向西迁移到现在的大陆 - 海洋边界。我们认为，与区域凹陷盆地的内部相比，外部的 More 和 Voring 盆地可能下伏有相对较厚的大陆地壳。在这种情况下，我们的观察结果不支持大面积的上地幔出土带的证据，此前有人认为该带是在岩浆作用和破裂之前形成的。