Gravity, magnetic anomalies, and tectonic features of the Aegir Ridge and adjacent areas
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摘要:
为研究北极地区挪威海内Aegir脊及邻区断裂构造特征，为北极地区油气勘探提供方向，在斯克里普斯海洋研究所发布的研究区重力数据（网格数据）基础上填充最新船测数据，对已有重磁资料进行异常分离、滑动平均和重磁场边界识别。目前，研究区的特征断裂和构造单元划分尚不清楚。根据异常极值带、异常带走向、异常梯度带变化程度等，对研究区进行了断裂识别和构造单元划分。研究表明：重磁异常特征呈NNE—NW—NE向展布，重力异常呈现高低分带，反映出该区基底隆坳相间的格架。根据重磁异常与断裂对应关系，识别出4个构造走向和7条主要断裂，划分出Mohns脊、扬马延微陆块、东扬马延断裂带、西扬马延断裂带、Aegir脊、东扬马延深海盆地和挪威深海盆地等7个构造单元。
Abstract:To study the characteristics of faults in the Aegir Ridge and its adjacent in the Norwegian Sea in the Arctic and provide direction for oil and gas exploration in the region, fill in the latest ship-borne survey data based on the gravity data (grid data) released by the Scripps Institution of Oceanography. The available and the new gravity and magnetic data were analyzed by anomaly separation, sliding average, and magneto-gravity field boundary identification. At present, the division of characteristic faults and tectonic units in the study area remain unclear. According to the abnormal extreme-value, the trend of the abnormal zone, the variation scale of the abnormal gradient zone were clarified and the fault identification and structural unit division were performed. Results show that the magneto-gravity and the anomalies feature an NNE-NW-NE distribution. The gravity anomaly shows high-and-low zonation, reflecting the uplift-and-depression framework of the basement in this area. According to the corresponding relationship between magneto-gravity anomalies and faulting, 4 structural strikes and 7 regional faults were recognized. Finally, seven tectonic units were divided, i.e. Mohns Ridge, Jan Mayen Microcontinent, East Jan Mayen Fault Zone, West Jan Mayen Fault Zone, Aegir Ridge, East Jan Mayen Deep Sea Basin, and Norway Deep Sea Basin.
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Key words:
- tectonic units /
- fault /
- gravity and magnetic data /
- Aegir Ridge /
- Arctic region
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