New data on the geological structure of the southwestern Mendeleev Rise, Arctic Ocean

Arctic Ocean Mega Project: Paper 1 - Data collection

“…It was also found that among exposures of Paleozoic rocks, many instances of basalt, dolerite and basaltic tuff (Skolotnev et al, 2017(Skolotnev et al, , 2019 are present with isotopic ages of about 105-124 Ma (Skolotnev et al, in preparation). From the data acquired during the Arktika-2012 expedition, an isotopic age of approximately 127 Ma was obtained for basalts collected from the Trukshin Seamount (Morozov et al, 2013).…”

“…A principal aspect of this methodology is that rocks were sampled at regular depth intervals along such outcrops specifically for the purpose of constructing a geological cross-section. In total, 77 sites were sampled (Skolotnev et al, 2017(Skolotnev et al, , 2019.…”

Arctic ocean mega project: Paper 2 – Arctic stratigraphy and regional tectonic structure

“…In 2014 and 2016 rock samples were collected from four scarps on the Mendeleev Rise using a specially-equipped submarine (see Paper-1, Nikishin et al, 2021a). The samples were collected by Skolotnev et al (2017Skolotnev et al ( , 2019 and four sections were studied, composed mainly of deformed sedimentary rocks with Ordovician to Devonian fauna (see Paper-1, Nikishin et al, 2021a). These sections are pierced by basalt dikes and sills of Early Cretaceous age (105-124 Ma) (Skolotnev et al, 2017(Skolotnev et al, , 2019Skolotnev, unpublished data).…”

“…In addition to these data, numerous federal and commercial seismic lines acquired for the Barents, Kara, Laptev, East Siberian and Chukchi shelves during the past 10-15 years (e.g., Drachev et al, 2010;Kumar et al, 2011;Nikishin et al, 2014Nikishin et al, , 2017Nikishin et al, , 2018Nikishin et al, , 2019Ilhan and Coakley, 2018) also were available. For ground truth, rock samples were taken on sea floor scarps along the Lomonosov Ridge and Mendeleev Rise (Morozov et al, 2013;Petrov et al, 2016;Skolotnev et al, 2017Skolotnev et al, , 2019Knudsen et al, 2018;Rekant et al, 2019). In this paper we tie together seismic stratigraphic interpretations from the shelf to the deep-water parts of the ocean.…”

Seismic data and ancient zircons discovered on the Mendeleev Rise, Arctic Ocean, indicate continental crust

“…Three seamounts were sampled, including two slopes on Mount Trukshin, at a total of 77 sites (Fig. 2) 3,13,14,20,21 . The sample collection represents both volcanic cover on submarine horsts and intrusive bodies.…”