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N. E. Mikhaltsov Yu. V. Karyakin V. V. Abashev V. Yu. Bragin V. A. Vernikovsky A. V. Travin 《Doklady Earth Sciences》2016,471(2):1242-1246
New data on paleomagnetism and isotope geochronology of Jurassic and Early Cretaceous basic igneous rocks on Franz Josef Land Archipelago (FJL) represented by flows and dikes are discussed. The first paleomagnetic data obtained for these rocks offer the opportunity to suggest a model of spatial changes in the FJL block position during the Jurassic?Cretaceous. In the Early Jurassic, the block occupied a different position relative to Europe from the modern one. It was displaced in the northeasterly direction by a distance of approximately 500 km and rotated clockwise by about 40° relative to its modern position. By the Early Cretaceous, the FJL block occupied a position close to the present-day one avoiding subsequent substantial relative displacements. The data obtained are of principal significance for reconstructing the geodynamic evolution of Arctic structures in the Mesozoic and contribute greatly to the base of paleomagnetic data for the Arctic region, development of which is now in progress. 相似文献
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Doklady Earth Sciences - Carbonates showing the signs of crystallization from a melt were found in dolerites and basalts of lava covers and dikes of Alexandra Land, Heiss, and Newcomb islands.... 相似文献
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N.L. Dobretsov V.A. Vernikovsky Yu.V. Karyakin E.A. Korago V.A. Simonov 《Russian Geology and Geophysics》2013,54(8):874-887
The patterns and history of Mesozoic–Cenozoic plume magmatism in the Arctic is considered in relation with suprasubduction volcanism and geodynamic events. The Mesozoic–Cenozoic magmatic history of the area includes seven stages, distinguished by correlation of ages and compositions of volcanics associated with mid-ocean rifting, plumes, and subduction; three of seven stages correspond to global events at 230–200 Ma, 130–120 Ma, and 40–30 Ma. The reported study supports the inferred inverse correlation between plate velocities and amount of subduction-related volcanism. The gained knowledge is used for paleotectonic reconstructions in the Arctic. 相似文献
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Resulting from study of the geological structure of the Franz Josef Land and Svalbard archipelagoes, this work presents new
17 40Ar/39Ar age datings for basalts taken during coastal expeditions in 2006–2010. Radiological age determination for intrusive units
(sills) located in the western part of Nordensciold Land (Spitzbergen Island) has been made for the first time. In relation
to use of the interpretation results of marine geological-geophysical data, the distribution peculiarities and time ranges
for Jurassic-Cretaceous basic magmatism within the studied regions of the Barents Sea continental margin and within the Arctic
as a whole are discussed. 相似文献
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Doklady Earth Sciences - New data on studies of the chemical composition of basaltoids of western Spitsbergen for the purposes of their comparison with the investigated magmatic rocks of the Franz... 相似文献
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Yu. V. Karyakin 《Geotectonics》2008,42(4):324-326
The 41st Tectonic Conference on General and Regional Problems of Geotectonics and Geodynamics was held January 29–February 2, 2008 by the Interagency Tectonic Committee, Division of Earth Sciences, Russian Academy of Sciences (RAS). The Geological Institute, RAS, and the Faculty of Geology, Moscow State University (MSU), participated in the organization of the conference. 相似文献