![]() ![]() ![]() Moreover, rifting- and seafloor spreading-related processes formed many continental splinters and terranes that were transported and docked at higher latitudes. A series of rifted margins, abandoned rifted areas and presumably extinct oceanic basins fringe these regions. The present day Circum-Arctic region comprises a variety of tectonic settings: from active seafloor spreading in the North Atlantic and Eurasian Basin, and subduction in the North Pacific, to long-lived stable continental platforms in North America and Asia (Fig. In particular, mantle-lithosphere connections may hold some of the keys to deciphering the timing and mechanisms of opening and closing oceanic basins for the last 200 million years. As our knowledge about detailed structures of this remote region is increasing, new concepts and integrated data sets have to be employed for modelling its tectonic evolution. This data collection indicates a much more complicated structure of the Arctic crust than previously thought (e.g., Mosher et al. A wealth of new geophysical and geological data has been collected, older classified data have been made publically available, and several international efforts have contributed to large, regional data set compilations. Prompted by recent climate change and economic motives, the interest for studying the Arctic has exponentially increased in the last decade. Models of global plate circuits and the connection with the deep mantle are used here to re-evaluate a possible link between Arctic volcanism and mantle plumes. The origin of major igneous activity during the Cretaceous in the central Arctic (the Alpha–Mendeleev Ridge) and in the proximity of rifted margins (the so-called High Arctic Large Igneous Province-HALIP) is still debated. ![]() Although the age and opening mechanisms of the Amerasia Basin are still difficult to establish in detail, interpreted subducted slabs that reside in the High Arctic’s lower mantle point to one or two episodes of subduction that consumed crust of possibly Late Cretaceous–Jurassic age. Available tomographic models have also been scrutinized and evaluated for their potential to reveal the deeper structure of the Arctic region. Here, we review the most updated, publicly available Circum-Arctic digital compilations of magnetic and gravity data together with new models of the Arctic’s crust. Knowledge about the Arctic tectonic structure has changed in the last decade as a large number of new datasets have been collected and systematized. ![]()
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