Gravity, magnetic anomalies, and tectonic features of the Aegir Ridge and adjacent areas

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.