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Reutilisation of hydrothermal vent complexes for focused fluid flow on continental margins (Modgunn Arch, Norwegian Sea)
Basin Research ( IF 3.2 ) Pub Date : 2020-09-03 , DOI: 10.1111/bre.12507
Chantelle Roelofse 1 , Tiago M. Alves 1 , Kamal’deen O. Omosanya 2, 3
Affiliation  

Conventional three‐dimensional (3D) seismic data reveal abundant igneous activity on the Modgunn Arch, mid‐Norwegian margin. Magmatic sills and associated hydrothermal vent complexes located at various depths prove the repeated utilisation of Paleocene‐Eocene magmatic conduits. In total, 125 sills and 85 hydrothermal vent complexes were identified and mapped, with vent complexes ranging in diameter from 300 to 3,100 m and sills from 0.5 to 50 km. Three examples of stacked vent complexes are presented, revealing large eruptions of hydrothermal fluids vertically through the same conduit, from sills to the palaeo‐sea floor. The vent complexes are found throughout Paleocene strata (66–56 Ma), whilst at least ten (10) vents were active during the Eocene. This study emphasises the importance of characterising ancient magmatic structures, as hydrothermal conduits and vent structures were, and may still be, reutilised as preferential fluid flow pathways to shallower strata. A minimum of four phases of hydrothermal vent complex formation are inferred. Cretaceous faults are both bypassed and used for magma and fluid flow. The reutilisation of magmatic structures here described may bring to light previously overlooked plays and renew interest in exploring magma‐rich continental margins.

中文翻译:

重新利用热液喷口综合体,使流体集中在大陆边缘(Modgunn Arch,挪威海)

常规的3D(3D)地震数据显示了挪威中部边缘Modgunn拱上的大量火成岩活动。位于不同深度的岩浆基岩和相关的热液喷口复合体证明了古新世-始新世岩浆导管的重复利用。总共确定并绘制了125个门槛和85个热液喷口配合物,喷口配合物的直径范围为300至3,100 m,门槛范围为0.5至50 km。给出了堆叠式通风口复合体的三个实例,揭示了从基石到古海底垂直通过同一导管的大量热液喷发。整个古新世地层(66-56 Ma)都发现了喷口配合物,而在始新世期间至少有十(10)个喷口是活跃的。这项研究强调了表征古代岩浆结构的重要性,因为热液管道和通风口结构已经并且可能仍将被重新利用作为浅层地层的优先流体流动路径。推断至少有四个阶段的热液喷口复合物形成。白垩纪断层被绕开并用于岩浆和流体流动。这里描述的岩浆结构的重新利用可能使以前被忽视的岩层暴露出来,并重新引起人们对探索岩浆丰富的大陆边缘的兴趣。
更新日期:2020-09-03
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