The active rift system of the Arctic Ocean

Paleozoic and Precambrian rocks of Alaska and their role in its structural evolution

“…The line of earthquake epicenters along the Gakkel Ridge and Sadko trough, however, continues across the Sea of Laptev where it splits into a southerly trend that follows the Verkhoyansk Mountains and a more southeasterly trend that follows the Cherskiy system of mountain ranges and depressions (Rezanov, 1964). According to Rezanov, very active Quaternary tectonic movements in the Cherskiy Mountain system have pro-' duced large uplifts and depressions in this, the most active earthquake belt in Northeast U.S.S.R. Faulting and volcanism here has been recognized as a landward extension of the sea-floor-spreading tectonics of the Gakkel submarine ridge (Demenitskaya and Karasik, 1969). The available data from the Laptev Sea area, in my opinion, suggest that the tectonic conditions here may be similar to those in the Gulf of California where faulting extends inland from the East Pacific Rise (Larson and others, 1968).…”

“…The seismically and volcanically active mid-Atlantic ridge extends north from Iceland between Greenland and Spitsbergen (Vogt and others, 1970) and with apparent decreased seismicity (Sykes, 1965) continues across the Eurasia Basin as the Gakkel Ridge (Nansen Cordillera) that lies midway between the Lomonosov Ridge and the continental margin of Eurasia (Heezen and Tharp, 1965;Demenitskaya and Karasik, 1969) (fig. 2).…”

“…An analysis of geophysical data suggests that the tensional tectonic conditions of the Gakkel spreading center do not stop a t the head of the Eurasia Basin but continue into the continental framework of eastern Siberia (Demenitskaya and Karasik, 1969). The Sadko trough, an unusually large submarine canyon a t the head of the Eurasia Basin, is alined with the Gakkel Ridge, is the locus of earthquakes, and is reported to be a rift feature (Demenitskaya and Karasik, 1969) (fig.…”

“…The Sadko trough, an unusually large submarine canyon a t the head of the Eurasia Basin, is alined with the Gakkel Ridge, is the locus of earthquakes, and is reported to be a rift feature (Demenitskaya and Karasik, 1969) (fig. 24).…”

Geotectonic prerequisites for petroleum occurrences in northern seas of USSR

“…The larger Amerasian portion of the ocean, both in crustal structure and in the nature of the sedimentary cover, is a complex, apparently heterogeneous unit ( 8). The construction of this part of the Northern Arctic Ocean does not fall within the framework of the hypothesis of sea-floor spreading without definite reservations.…”