The tectonic evolution of the Norwegian Sea Continental Margin with emphasis on the Vøring and Møre Basins
The tectonic evolution of the Norwegian Sea Continental Margin with emphasis on the Vøring and Møre Basins
复制标题
挪威海大陆边缘的构造演化，重点关注沃尔令盆地和莫勒盆地
DOI：
--
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
H. Brekke
中科院分区：
文献类型：
--
作者：
H. Brekke
摘要挪威海大陆边缘主要由两个白垩纪盆地充填厚度很大的主要盆地组成：Vøring和Møre盆地。这些盆地的两侧是隆起的大陆和白垩纪的Trøndelag地台，西面是Møre和Vøring边缘高地，上面覆盖着始新世熔岩。本区构造发育受北东-南西向和北西-南东向两种构造走向控制。该区从石炭纪到上新世晚期一直处于构造活跃状态，主要构造阶段为晚古生代、中侏罗世晚期-早白垩世和晚白垩世-早第三纪。一般的构造发展包括一个长期的伸展和裂谷，在始新世早期结束的大陆分离，主要的火山活动和随后的海底扩张在挪威-格陵兰海。石炭纪-早白垩世伸展构造与板内大陆裂谷作用有关。晚白垩世和第三纪的构造活动受板块边界沿着的相对运动控制。总体北东-南西向构造颗粒由断层和盆地轴组成，可能起源于晚古生代，并在随后的构造阶段中活动。横向NW-SE趋势表示为主要的线性构造，可能反映了古老的前寒武纪基底颗粒。这些线性构造，其中两个是主要海洋断裂带的大陆地壳的延续，控制了整个白垩纪和第三纪的构造活动，构成了该地区主要构造区之间的边界。中侏罗世晚期-早白垩世伸展阶段开始分异为白垩纪盆地、边界台地和边缘隆起。随后的白垩纪沉降历史，盆地侧翼由弯曲而不是断层形成，导致异常厚的盆地填充。在Vøring盆地，白垩纪的发展包括早期热沉降阶段和构造驱动沉降的后Cenomanian阶段，其中包括正常断层、压缩和褶皱的间歇阶段。Vøring盆地在第三纪时期也是构造活跃的，走滑-挤压的主要阶段与始新世晚期和中新世中期的阿尔卑斯造山作用相吻合。在Vøring盆地内，有证据表明在中新世中期和上新世晚期形成了蛋白石A-蛋白石-CT过渡化石和广泛的区域性海洋侵蚀。相比之下，莫雷盆地在整个白垩纪和第三纪期间基本上是构造平静的，主要经历了持续的沉降。
Abstract The Norwegian Sea continental margin is dominated by two major basins with a very thick Cretaceous basin fill: the Vøring and Møre Basins. The basins are flanked by the uplifted mainland and the Cretaceous Trøndelag Platform to the east and by the Møre and Vøring Marginal Highs capped by Eocene lavas to the west. The tectonic development of the area is controlled by two structural trends: NE-SW and NW-SE. The area has been tectonically active from Carboniferous to Late Pliocene time with the main tectonic phases in Late Palaeozoic, late Mid-Jurassic-Early Cretaceous and Late Cretaceous-Early Tertiary time. The general tectonic development comprised a long period of extension and rifting that ended in Early Eocene time by continental separation, major volcanism and subsequent sea-floor spreading in the Norwegian-Greenland Sea. In Carboniferous to Early Cretaceous time the extensional tectonics were related to within-plate continental rifting. The tectonics of the Late Cretaceous and the Tertiary periods were controlled by the relative movements along plate boundaries. The overall NE-SW structural grain is constituted by faults and basin axes that probably originated in Late Palaeozoic time and were active during all subsequent tectonic phases. The transverse NW-SE trend is expressed as major lineaments that probably reflect the old, Precambrian grain of the basement. These lineaments, two of which are the continuation into the continental crust of major oceanic fracture zones, controlled the tectonic activity throughout Cretaceous and Tertiary time and constitute the boundaries between the major structural provinces of the area. The differentiation into the Cretaceous basins and the bounding platforms and marginal highs started by the late Mid-Jurassic-Early Cretaceous extensional phase. The subsequent Cretaceous subsidence history, where the basin flanks formed by flexuring rather than faulting, resulted in an exceptionally thick basin fill. In the Vøring Basin the Cretaceous development comprised an early thermal subsidence phase and a post-Cenomanian phase of tectonically driven subsidence involving intermittent phases of normal faulting and compression and folding. The Vøring Basin was tectonically active also during Tertiary time with the main phases of strike-slip-compression coinciding with the Alpine orogenies in Late Eocene and Mid-Miocene time. Within the Vøring Basin there is evidence of the formation of a fossil opal A-opal-CT transition and extensive regional marine erosion in Mid-Miocene and Late Pliocene times. In contrast, the Møre Basin was generally tectonically quiet throughout the Cretaceous and Tertiary periods, experiencing mainly continuous subsidence.