Asymmetric crustal structure of the ultraslow-spreading Mohns Ridge ...

• Main Authors: Zhang, Tao, Lin, Jian, Gao, Jinyao
• Format: Text
• Language: unknown
• Published: Taylor & Francis 2019
• Subjects: Microbiology; FOS Biological sciences; Cell Biology; Genetics; Physiology; Environmental Sciences not elsewhere classified; Chemical Sciences not elsewhere classified; Ecology; Biological Sciences not elsewhere classified; Cancer; Inorganic Chemistry; FOS Chemical sciences; Hematology; Jan Mayen; Kolbeinsey; Kolbeinsey Ridge; Iceland
• Online Access: https://dx.doi.org/10.6084/m9.figshare.8247392; https://tandf.figshare.com/articles/journal_contribution/Asymmetric_crustal_structure_of_the_ultraslow-spreading_Mohns_Ridge/8247392

New analysis of the geophysical data of the ultraslow-spreading Mohns Ridge and its off-axis structure reveals a distinctive asymmetric structure. We calculate residual bathymetry (RB) and residual mantle Bouguer gravity anomaly (RMBA) and decompose the anomalies into symmetric and asymmetric components between the ridge conjugates. The western flank of the Mohns Ridge at crustal age of ~50–15 Ma is characterized by a broad zone of elevated RB and more negative RMBA, which we term the Vesteris Plateau (VP). The VP anomaly has a surface area of ~1.12 × 10 5 km 2 and an excess crust volume of ~2.33 × 10 5 km 3 , making it a significant anomaly comparable to other anomalies such as the Bermuda Rise. Extending north of the Kolbeinsey Ridge for more than 500 km, the VP lies above an anomalous upper mantle region of low shear-wave seismic velocity, indicating that the VP might represent the northernmost reach of the Iceland-Jan Mayen mantle anomaly. In addition, the western ridge flank of the Mohns Ridge at ...