Interplay between base-salt relief, progradational sediment loading and salt tectonics in the Nordkapp Basin, Barents Sea

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Interplay between base-salt relief, progradational sediment loading and salt tectonics in the Nordkapp Basin, Barents Sea – Part II
Basin Research ( IF 2.8 ) Pub Date : 2021-08-28 , DOI: 10.1111/bre.12602
Muhammad Hassaan _{1,

2} , Jan Inge Faleide _{1,

2} , Roy Helge Gabrielsen ₁ , Filippos Tsikalas _{1,

3} , Silje Grimstad ₄

Affiliation

Reprocessed, regional, 2D seismic reflection profiles, 3D seismic volumes and well data (exploration and shallow boreholes), combined with 2D structural restorations and 1D backstripping were used to study the post-salt evolution of the Nordkapp Basin in Barents Sea. The post-salt evolution took place above a pre-salt basement and basin configuration affected by multiple rift events that influenced the depositional facies and thickness of Pennsylvanian-lower Permian-layered evaporite sequence. Initially, regional mid-late Permian extension reactivated pre-salt Carboniferous faults, caused minor normal faulting in the Permian strata and triggered slight salt mobilization towards structural highs. The main phase of salt mobilization occurred during earliest Triassic when thick and rapidly prograding sediments entered from the east into the Nordkapp Basin. In the early-mid-Triassic, the change in the direction of progradation and sediment entry-points shifted to the NW led to rotation of the earlier-formed mini-basins and shift of dominant salt evacuation direction to the south. The prograding sediment influx direction, sediment transport velocity and thickness influenced the dynamics of the early to late passive diapirism, salt expulsion and depletion along the strike of the basin. The basin topography resulting from salt highs and mini-basin lows strongly affected the Triassic progradational fairways and determined the distinct sediment routing patterns. Minor rejuvenation of the salt structures and rotation of the mini-basins took place at the Triassic–Jurassic transition, due to far-field stresses caused by the evolving Novaya Zemlya fold-and-thrust belt to the east. This rejuvenation influenced the sediment dispersal routings and caused formation of dwarf secondary mini-basins. The second and main rejuvenation phase took place during likely early-mid-Eocene when propagated far-field stresses from the transpressional Eurekan/Spitsbergen orogeny to the NW inverted pre-salt normal faults, reactivated the structural highs and rejuvenated the salt structures. The studied processes and study outcomes can be applicable to other evaporite-dominated basins worldwide.

中文翻译：

巴伦支海 Nordkapp 盆地的盐基释放、前积沉积物载荷和盐构造之间的相互作用——第二部分

再处理的区域 2D 地震反射剖面、3D 地震体和井数据（勘探和浅钻孔），结合 2D 结构修复和 1D 回采，用于研究巴伦支海 Nordkapp 盆地的盐后演化。盐后演化发生在盐下基底和盆地构造之上，受多个裂谷事件影响，这些裂谷事件影响了宾夕法尼亚-下二叠纪层状蒸发岩层序的沉积相和厚度。最初，区域中晚二叠世伸展重新激活了盐下石炭纪断层，在二叠纪地层中引起了轻微的正断层，并引发了轻微的盐向构造高点的移动。盐分动员的主要阶段发生在最早的三叠纪，当时厚而快速的沉积物从东部进入诺德卡普盆地。早中三叠世，进积方向的变化和沉积物入口点向NW移动，导致早期形成的微型盆地发生旋转，盐分流失的主导方向向南移动。进积泥沙流入方向、泥沙输移速度和厚度影响了盆地早晚期被动底辟、排盐和耗竭的动力学。由盐高和迷你盆地低引起的盆地地形强烈影响了三叠纪进积航道，并决定了不同的沉积物路径模式。由于向东演化的新地岛褶皱冲断带造成远场应力，在三叠纪-侏罗纪过渡期发生了盐结构的轻微复兴和小型盆地的旋转。这种复兴影响了沉积物扩散路径并导致矮小的次生小型盆地的形成。第二个也是主要的复兴阶段发生在可能的早中始新世期间，当远场应力从横压 Eurekan/Spitsbergen 造山带传播到 NW 反向盐下正断层，重新激活结构高点并使盐结构恢复活力时。所研究的过程和研究结果可适用于全球其他以蒸发岩为主的盆地。这种复兴影响了沉积物扩散路径并导致矮小的次生小型盆地的形成。第二个也是主要的复兴阶段发生在可能的早中始新世期间，当远场应力从横压 Eurekan/Spitsbergen 造山带传播到 NW 反向盐下正断层，重新激活结构高点并使盐结构恢复活力时。所研究的过程和研究结果可适用于全球其他以蒸发岩为主的盆地。这种复兴影响了沉积物扩散路径并导致矮小的次生小型盆地的形成。第二个也是主要的复兴阶段发生在可能的早中始新世期间，当远场应力从横压 Eurekan/Spitsbergen 造山带传播到 NW 反向盐下正断层时，重新激活了构造高点并使盐结构恢复活力。所研究的过程和研究结果可适用于全球其他以蒸发岩为主的盆地。重新激活结构高点并使盐结构恢复活力。所研究的过程和研究结果可适用于全球其他以蒸发岩为主的盆地。重新激活结构高点并使盐结构恢复活力。所研究的过程和研究结果可适用于全球其他以蒸发岩为主的盆地。

更新日期：2021-08-28

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