Initial Opening of the Eurasian Basin, Arctic Ocean

Late Cenozoic Erosion Estimates for the Northern Barents Sea: Quantifying Glacial Sediment Input to the Arctic Ocean

“…Seismic profiles BGR13‐207 and BGR13‐208 (figure originally appeared in Frontiers in Earth Science, doi: 10.3389/feart.2016.00091, Berglar et al, with nomenclature following Engen et al, ). (a) Sediment progradation is interpreted as part of Franz Victoria TMF.…”

“…The Eurasia Basin, comprising the Amundsen and Nansen basins, is associated with continental breakup and subsequent seafloor spreading approximately at the Paleocene-Eocene transition (~55 Ma; Srivastava & Tapscott, 1986;Talwani & Eldholm, 1977), although an earlier start of spreading, around magnetic anomaly 25 (~57 Ma), is proposed by Brozena et al (2003). This event involved separation of the Lomonosov Ridge from the northern Barents Sea shelf, which was initiated by right-lateral movement (Berglar et al, 2016;Minakov et al, 2013). The Gakkel Ridge, which separates the Amundsen and Nansen basins, is characterized as an ultraslow spreading ridge (0.63-1.3 cm/yr; Jokat & Micksch, 2004).…”

“…Medium to good quality seismic data of regional coverage have allowed us to better study the northwestern Barents Sea continental margin, including its glacigenic strata and sedimentary style that so far had not been studied in detail beyond the Last Glacial Maximum (LGM). We use recently acquired multichannel seismic data from various sources (Berglar et al, ; Engen et al, ; Geissler et al, ; Geissler & Jokat, ) to investigate the distribution of the Neogene‐Quaternary deposits within the continental shelf, slope, and the adjacent deep‐sea basin. The sedimentary processes are discussed based on seismic facies analysis focusing on the TMF development and a buried megaslide.…”

A North Pole thermal anomaly? Evidence from new and existing heat flow measurements from the central Arctic Ocean

“…The transition from 137 continental to oceanic lithosphere along the Amundsen Basin flank of the 138 Lomonosov Ridge is thought to be relatively abrupt. There is minimal exhumed 139 mantle or "transitional crust" along the Lomonosov margin (Cochran et al, 2006;140 Jokat and Micksch, 2004), which is instead described to be delineated by fault-141 bounded half grabens (Jokat et al, 1992 (Minakov et al, 2013), possibly starting in the 174 Cretaceous (Berglar et al, 2016). Seafloor spreading in the region of the central 175 part of the Lomonosov Ridge (the 'knee' like geometry) is proposed to have been 176 delayed until around 40 Ma (Minakov and Podladchikov, 2012) or prior to C22 177 (~50 Ma; Cochran et al, 2006), acting as an accommodation or oblique rift zone 178 in earlier times.…”

ArcCRUST: Arctic Crustal Thickness From 3‐D Gravity Inversion

“…These maps and data sets have been extensively used for planning new data collection and better understanding of the present‐day local structure and tectonics of various Arctic areas (e.g., Berglar et al, ; D. Chian et al, ; Petrov et al, ). New geophysical and geological data recently collected in the Arctic realm revealed the nature and thickness of crustal basement in several poorly studied and/or disputed regions in the context of the Law of the Sea treaty such as the Alpha and Mendeleev Ridges (Funck et al, ; Lebedeva‐Ivanova et al, ), the Canada Basin (Chian & Lebedeva‐Ivanova, ), and the Lomonosov Ridge and adjacent basins (Jokat & Ickrath, ; Langinen et al, ).…”