Gravity inversion predicts the nature of the Amundsen Basin and its continental borderlands near Greenland

Initial Opening of the Eurasian Basin, Arctic Ocean

“…More prominently, this trend is observed in the magnetic data between the Morris Jesup Rise and the Lomonosov Ridge in the Lincoln Sea ( Figure 2B), and is mirrored by gravity data (Døssing et al, 2014). Thus, the earliest magnetic chrons show an extension direction that, close to the Yermak Plateau and Morris Jesup Rise, considerably deviates from the younger chrons.…”

“…Rather we identify distinct rotated crustal blocks, interpreted to be bounded by major listric normal faults. Previously, gravity and magnetic anomaly lows immediately northeastward of the Yermak Plateau and Morris Jesup Rise, and trending about perpendicular to the seafloor spreading direction, have been interpreted as a major Eurekan fault zone, involving crustal shortening ( Døssing et al, 2013Døssing et al, , 2014 and potentially subduction (Brozena et al, 2003), as consequence of the Paleogene northward convergence of Greenland. Plate tectonic models often compensate for the extension in the Labrador Sea and Baffin Bay by invoking a northeastward movement of Greenland.…”

“…However, they did not present a conclusive interpretation in between the North Barents Sea continental margin and magnetic anomaly C24. Several recent magnetic anomaly interpretations and plate models favor the presence of magnetic chron C25 (Brozena et al, 2003;Cochran et al, 2006;Døssing et al, 2014) with an age of ∼56 Ma from the Late Paleocene. Brozena et al (2003) identified anomalies C25 to C15 (56-34.8 Ma) terminating shortly before the NE Yermak Plateau and Morris Jesup Rise flanks, anomalies C12-C8 (30.8-25.9 Ma) spreading apart of the plateaus and extending for another 60-90 km to the SW, and anomaly C5 (9.8 Ma) continuing into the Fram Strait.…”

Ultraslow spreading, ridge relocation and compressional events in the East Arctic region: A link to the Eurekan orogeny?

“…Numerous field campaigns in the last two decades to the Ellesmere islands reported features that document polyphase Eurekan deformation as complex networks of NNE-SSW and NW-SE trending faults and ESE-directed frontal thrust of the Eurekan Foldand-Thrust Belt [35]. In some areas, the faults were reactivated during SE-directed thrust tectonics in Mid-Eocene The idea of Eurekan deformation affecting areas beyond the Ellesmere Islands has been put forward in recent studies which combined knowledge of crustal structure from new geophysical data with results from modeling, and shows that the oceanic Amundsen Basin, the continental Lomonosov Ridge and the Morris Jessup Rise were all disturbed by significant Eurekan compression [10]. In particular, Dossing et al [9] suggested that Eurekan crustal shortening contributed to the formation of the distinct Lomonosov Ridge plateau against an important fault zone north of Greenland.…”

Basement structure of the Hontomín CO<sub>2</sub> storage site (Spain) determined by integration of microgravity and 3-D seismic data

“…Døssing et al, 2014;Engen, et al, 2006;Chappell et al, 2008). This approach is sensitive to the effective removal of the gravimetric signature of the sedimentary cover and the regional, long wavelength anomaly contribution.…”