Abstract
Basing on the results of the interpretation of new seismic materials, the authors consider the structural features of the southern segments of the Eurasian Basin and the Lomonosov Ridge in the zone of junction with the continental margin of Siberia (the Laptev and East Siberian Seas). Interpretative analysis of the materials shows that the base of the sedimentary cover of the southern segment of the Eurasian Basin, where there are no regular linear magnetic anomalies, is predominantly represented by strongly stretched blocks of the continental basement. The formation the axial zone of spreading of the Gakkel Ridge here took place according to a three-stage development scheme: rifting in the Aptian-Alba and its telescoping development in the Late Cretaceous — Paleocene-Eocene, inherited valley formation in late neotectonic time. The development of the Severny Basin located in the zone of junction of the Lomonosov Ridge with the continental margin is similar to the scenario for the formation of pull-apart basins. Its formation was interconnected with the simultaneously opening adjacent extreme southeastern segment of the Amundsen Basin of the Eurasian Basin.
Highlights
Basing on the results of the interpretation of new seismic materials, the authors consider the structural features of the southern segments of the Eurasian Basin and the Lomonosov Ridge in the zone of junction with the continental margin of Siberia
Shipilov Polar Geophysical Institute of the Kola Scientific Center of Russian Academy of Sciences (Murmansk, Russian Federation)
Summary
О ТЕКТОНО-ГЕОДИНАМИЧЕСКИХ ВЗАИМООТНОШЕНИЯХ ЕВРАЗИЙСКОГО БАССЕЙНА И ХРЕБТА ЛОМОНОСОВА С КОНТИНЕНТАЛЬНОЙ ОКРАИНОЙ СИБИРИ ПО НОВЫМ СЕЙСМИЧЕСКИМ ДАННЫМ. Развитие бассейна Северного, расположенного в зоне сочленения хребта Ломоносова с континентальной окраиной, сходно по сценарию формирования бассейнов типа pull-apart. Other designations: ВГП — Wrangel-Herald Rise (ridge, arc), СП — Siberian Platform, Ч — Chukotka Massif, АА — Arctic Alaska, ХЛЗ — Khatanga-Lomonosov fault zone, ЧКЗ — Chukotka-Canadian fault zone, ВП — Podvodnikov Depression в самых южных сегментах хребта Ломоносова и Евразийского бассейна в зонах их сочленения с континентальной окраиной Сибири. 2. Схема разломов и мощности осадочного чехла в зоне сочленения хребта Ломоносова с континентальной окраиной Сибири по результатам сейсмогравитационного моделирования по [9] с изменениями. Рассмотрение новых материалов сейсмических исследований и различных вариантов карт рельефа фундамента и мощности осадочного чехла [9—11 и др.] позволяет считать, что заложение Северного прогиба, локализованного в зоне сочленения хребта Ломоносова с Сибирским шельфом, происходило под влиянием рифтинга в меловое время. I — the Lomonosov Ridge; II — torn (lagged) blocks of the Lomonosov Ridge, III — Severny Basin (pull-apart), IV — continental margin, V — the Novosibirsk Archipelago, VI — southeastern segment of the Amundsen Basin, VII — the Gakkel Ridge
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