Journal of Volcanology and SeismologyJournal of Volcanology and SeismologyВулканология и сейсмология0203-03063034-5138The Russian Academy of Sciences1766910.31857/S0203-03062019666-78ArticlesСтатьиResearch ArticleThe structure and evolution of the east Greenland continental margin before spreading started on the Kolbeinsey ridgeСтроение и развитие восточно-гренландской континентальной окраины до начала спрединга на хребте КолбейнсейUsenkoS. V.УсенкоС. В.
Russian Federation
usenko@mitp.ruProkhorovaT. V.ПрохороваТ. В.
Russian Federation
tatprokh@mitp.ruInstitute of Earthquake Prediction Theory and Mathematical Geophysics, Russian Academy of SciencesИнститут теории прогноза землетрясений и математической геофизики РАНSchmidt Institute of Physics of the Earth, Russian Academy of ScienceИнститут физики Земли им. О.Ю. Шмидта РАН12112019666780911201909112019Copyright ©; 2019, Russian academy of sciencesCopyright ©; 2019, Российская академия наук2019Russian academy of sciencesРоссийская академия наукhttps://journals.eco-vector.com/0203-0306/article/view/17669

An analysis of the deep structure of the East Greenland margin (Blosseville Kyst to Liverpool Land) and of the Jan Mayen microcontinent resulted in the development of a crustal model that was valid for both before their disruption. A joint model clearly demonstrates the net result of rifting phases during Paleozoic, Mesozoic, and Cenozoic time. Starting from the Devonian, a graben-shaped depression about 180 km wide existed between Liverpool Land and the Jan Mayen Ridge; the depression was formed by subsiding of the crystalline basement that was not compensated by sedimentation. The marine basin was approximately 2 km deep during late Devonian time. The west-east joint deep crustal section clearly defines three depths in the upper mantle that fit dome-like surfaces superposed on each other. We interpret these surfaces as temperature fronts of mantle plumes that differ by their time of origin: Paleozoic, Mesozoic to Cenozoic, and late Cenozoic. The rim of the present-day Blosseville Kyst and Liverpool Land shelf is found to be underlain by a basement high that is associated with the axis of a positive free-air gravity anomaly. East of the high along the anomaly axis, we identified a continent-ocean boundary. The present-day phase in the geological evolution of the Greenland-Norwegian region north of Iceland is characterized by an increased thermal state of the lithosphere and manifestations of intraplate tectonics.

В результате анализа глубинного строения Восточно-Гренландской окраины (Блоссевил Кист – Ливерпуль Ленд) и микроконтинента Ян-Майен составлена единая модель земной коры до их раскола. Совмещенная модель наглядно демонстрирует суммарный результат этапов рифтогенеза в палеозое, мезозое и кайнозое. Начиная с девонского времени, между Ливерпуль Ленд и хребтом Ян-Майен существовал грабенообразный прогиб шириной порядка 180 км, который был образован в результате некомпенсированного осадконакоплением прогибания кристаллического фундамента. Глубина морского бассейна в конце девонского времени составляла около 2 км.

На совмещенном глубинном разрезе земной коры, с запада на восток, отчетливо выделяются три уровня глубины залегания поверхности верхней мантии, апроксимирующие наложенные друг на друга куполообразные поверхности. Мы интерпретируем эти поверхности как температурные фронты разных по времени формирования мантийных плюмов: палеозойский, мезо-кайнозойский и позднекайнозойский.

Под бровкой современного шельфа Блоссевил Кист (Blosseville Kyst) и Ливерпуль Ленд (Liverpool Land) выделено поднятие фундамента, которое коррелируется с осью положительной гравитационной аномалии в редукции свободного воздуха (free-air gravity). Восточнее поднятия вдоль оси аномалии намечена граница континент-океан. Современный этап геологического развития Гренландско-Норвежского региона, севернее Исландии, характеризуется повышенным термальным состоянием литосферы и проявлением внутриплитной тектоники.

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