Manifestations of Degassing in Sedimentary Cover of the Southeastern Flank of the Knipovich Ridge (North Atlantic)

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Lithology and Mineral Resources Pub Date : 2022-09-12 DOI:10.1134/S0024490222050078
S. Yu. Sokolov, G. D. Agranov, S. I. Shkarubo, A. V. Zayonchek, A. S. Abramova
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Abstract

The paper analyzes the “bright spot” and “flat spot” anomalies of seismic data on the southeastern flank of the Knipovich Ridge associated with the accumulation of free gas in the sedimentary cover above the oceanic basement. The identified anomalies are associated spatially with negative values of the residual Bouguer anomaly and positive magnetic field (ΔТа) anomalies. This fact indicates the existence of decompaction zones in the crust and upper mantle related to serpentinization that can also provoke the superimposed, probably modern, chemogenic magnetization and distortion of the primary linear pattern of magnetic anomalies in the oceanic basement in the study area. Serpentinization was also responsible for vertical displacements of the crustal and upper mantle blocks on the flanks, leading to deformations of the sedimentary cover with the rock dilation. Off-axis seismicity indicates tectonic disruptions on flanks of the ridge with a higher access of water necessary for the serpentinization and the subsequent change in the physical properties of rocks reflected in geophysical fields. The eastern flank of the Knipovich Ridge underwent tectonic activation along the basement structures representing the northern extension of the Senja fracture zone, resulting in accumulations of free gas in the sedimentary cover.

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北大西洋尼波维奇脊东南翼沉积盖层脱气的表现
本文分析了尼波维奇脊东南侧地震资料中的“亮点”和“平斑”异常,这些异常与大洋基底上沉积盖层中游离气的聚集有关。识别的异常在空间上与残余布格异常的负值和正磁场(ΔТа)异常相关联。这一事实表明,地壳和上地幔中存在与蛇纹石化有关的分解带,这些分解带也可能引起研究区洋基底的化学磁化叠加,可能是现代的,并使原始线性磁异常模式失真。蛇纹石化还造成了两侧地壳和上地幔块体的垂直位移,导致沉积层随岩石膨胀而变形。离轴地震活动性表明山脊两侧的构造破坏,具有较高的水通道,这是蛇纹石化和随后在地球物理场中反映的岩石物理性质变化所必需的。Knipovich Ridge东翼沿基底构造(Senja断裂带向北伸展)发生构造活动,导致沉积盖层中游离气聚集。
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来源期刊
Lithology and Mineral Resources
Lithology and Mineral Resources 地学-地球化学与地球物理
CiteScore
1.30
自引率
37.50%
发文量
29
审稿时长
>12 weeks
期刊介绍: Lithology and Mineral Resources is an international peer reviewed journal that publishes articles on a wide range of problems related to the formation of sedimentary rocks and ores. Special attention is given to comparison of ancient sedimentary rock and ore formation with present-day processes. The major part of the journal is devoted to comparative analysis of sedimentary processes on the continents and in oceans, as well as the genetic aspects of the formation of sedimentary and hydrothermal–sedimentary mineral resources. The journal welcomes manuscripts from all countries in the English or Russian language.
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