GEOPHYSICAL RESEARCH, 2018, vol. 19, no. 2, pp. 57-70. https://doi.org/10.21455/gr2018.2-3
UDC 550.838.3
Abstract References Full text (in Russian)
A MODEL OF THE MAGNETICALLY ACTIVE LAYER OF THE WHITE SEA PALEORIFT SYSTEM
Yu.V. Brusilovskiy(1), A.N. Ivanenko(1), A.S. Baluev(2), V.A. Zhuravlyov(3)
(1) Shirshov Institute of Oceanology RAS, Moscow, Russia
(2) Geological Institute, Russian Academy of Science, Moscow, Russia
(3) Marine Arctic Geological Expedition, Murmansk, Russia
Abstract. The model of structure and formation of a magnetically active layer of the White Sea paleorift system was created based on the results of analysis and interpretation of anomalous magnetic field and other geological and geophysical data. It is shown that the structure of this layer is complex and reflects all main stages of tectonic activity of the region from the middle and late Riphean to events of the last ice age in a Pleistocene. The model of the magnetically active layer is composed from three structural levels (horizons); each level reflects a certain stage of formation of the studied area. The lower structural level in the basis of a magnetically active layer reflects a rift stage of evolution of the White Sea mobile belt in the middle and a late Riphean characterized by manifestation of a continental riftogenez [Baluyev et al., 2012]. The average structural horizon reflects the middle Paleozoic, late Devonian, stage of the rift system reactivation characterized by alkaline and ultramafic magmatism and presented by swarms of alkaline dikes and tubes of explosion including kimberlites. The upper structural level reflects a high-frequency component of anomalous magnetic field and is connected with the sources of high magnetic anomalies located at its top. Characteristics of this structural level suggest that it could be formed during the last late stage of tectonic activation of this region.
Keywords: paleorift system of the White Sea, rifting model, magnetically active layer, inverse problem, a division of fields, effective magnetization.
References
Aplonov S.V., Burzin M.V., Weiss A.F., Vladimirova T.V., Gorbachev V.I., Kapustin I.N., Kovalenko V.S., Lebedev B.A., Makhotkin A.I., Rassomakhin V.Ya., Sapozhnikov R.B., Simonenko L.A., Suleymanov A.K., Tymoshenko O.M., Timoshenkov N.V., Fyodorov D.L., Hisamov R.S., Chamov N.P., Chenborisova R.Z., and Shirobokov V.N. Geodinamika Mezenskogo osadochnogo basseina (Geodynamics of the Mezen sedimentary basin), St.Petersburg: Nauka, 2006.
Baluyev A.S., Vasilyeva T.I., Glukhovsky M.Z., Moralyov V.M., VA., Przhiyaglovsky E.S., and Terekhov E.N. Geodynamic evolution of the paleorift systems of the White and Barents seas. Geologiya, geokhimiya i geofizika na rubezhe XX-XXI vekov, t. 1 Tektonika, stratigrafiya, litologiya (Geology, geochemistry, and geophysics at a turn of XX XXI centuries. Tectonics, stratigraphy, lithology), Moscow: Svyaz-print, 2002, vol. 1, pp. 23-25.
Baluyev A.S., Zhuravlyov V.A., Terekhov E.N., and Przhiyaglovsky E.S. Tektonika Belogo morya i prilegayushchikh territorii (Tectonics of the White Sea and adjacent territories. An explanatory note to “The tectonic map of the White Sea and adjacent territories” scale 1:500000), Moscow: GEOS, 2012.
Baluyev A.S., Zhuravlyov V.A., Kolodyazhny S.Yu., Przhiyaglovsky E.S., Slabunov A.I., Terekhov E.N., Sharov N.V., and Shkarubo S.I. Tektonicheskaya karta Belogo morya i prilegayushchikh territorii (Tectonic map of the White Sea and adjacent territories), scale 1:500000, ed. M.G. Leonov and G.S. Kazanin, Moscow: IPP “Kuna”, 2012.
Brusilovsky Yu.V., Ivanenko A.N., Popov K.V., and Filin A.M. Geomagnetic Survey in the White Sea, Oceanology, 2003, vol. 43, no. 2, pp. 258-262.
Bush V.A. and Kalmykov B A. New data on domezozoysky intra slabby magmatism of the East European platform, Geotectonics, 2015, no. 5, pp. 43-61.
Cooper G.R.J. Forward modelling of magnetic data, Comput geosci-computers & geosci, 1997, vol. 23, no. 10, pp. 1125-1129.
Ivanenko A.N., Brusilovsky Yu.V., Filin A.M., and Shishkina N.A. Modern technologies of processing and interpretation of magnetic data during the works on sea oil and gas fields, Geophysics, 2012, no. 3, pp. 60-71.
Ivanenko A.N. and Shishlyaev V.V. Automatic mapping of sources of potential fields, Materialy XX Mezhd. Nauch. Konf. (Shkola po morskoi geologii) (Proc. XX Int. Sci. Conf. (School on sea geology), Moscow: GEOS, 2013, vol. 5, pp.116-119.
Last B.J. and Kubik K. Compact gravity inversion. Geophysics, 1983, vol. 48, pp. 713-721.
Portniaguine O. and Zhdanov M.S. Focusing geophysical inversion images. Geophysics, 1999, vol. 64, pp. 874-887.
Zhuravlyov V.A. Structure of crust of the White Sea region, Razvedka i okhrana nedr (Investigation and protection of a subsurface), 2007, no. 9, pp. 22-26.
Zhuravlyov V.A., Pavlov S.P., and Shipilov E.V. Structure of the basement and sedimentary cover of the White Sea sector of the East European platform. Kompleksnye issledovaniya potsessov, kharacteristik i resursov rossiiskikh morey Severo-Evropeiskogo basseina (Complex research of processes, characteristics, and resources of the Russian seas of the North European basin), Apatity: KNTS RAN, 2007, no. 2, pp. 302-310.