Magnetic anomalies and the features of geodynamic development of the Antarctic Peninsula continental margin structures


  • V.D. Soloviev S.I. Subbotin Institute of Geophysics, National Academy of Sciences of Ukraine, Ukraine
  • I.N. Korchagin S.I. Subbotin Institute of Geophysics, National Academy of Sciences of Ukraine, Ukraine



Antarctic Peninsula, crust, Pacific Margin anomaly, sources of magnetic anomalies, geodynamics


New geophysical models of the Earth's crust were used to study the possible nature of the Pacific Margin Anomaly (PMA) near the Antarctic Peninsula (AP). The data have been presented, which permitted analyzing spatial distribution of PMA and its deep sources on the continental margin of AP. Western and Eastern PMA-branches may correspond to different crustal blocks associated with predominantly Cretaceous magmatic intrusions of basic rocks. These branches of PMA were formed in the Early Cretaceous in structures, separated by a fault zone. Spatial heterogeneity of different segments of РМА may also be connected with different depth, thickness and magnetic susceptibility of separate bodies, which form the sources of regional anomalies. Active tectonic processes in the Mesozoic—Cenozoic resulted in the complex evolution of the structures of the region and appearance of vast deep magnetic sources of PMA along the AP margin formed during the phases of magmatic activity. Formation of separate segments of PMA can be connected with processes of tectonic movements near the border of the plates (Antarctica and Scotia) as well as in the areas of paleorifts formation. New geophysical results for different PMA-segments (from the Palmer Land to Powell Basin) replenish current ideas on the sources and origin of this big positive magnetic anomaly of the Pacific coast and show the necessity of searching new mechanisms of forming the structures of continental margin of AP


Bakhmutov V. G., 2006. Evolution and geodynamics of the main structures of the Western Antarctic in Mezo-Cenozoic: modern conception. Ukrayinskyy antarktychnyy zhurnal (4-5), 52—63 (in Russian).

Kozlenko Yu. V., Kozlenko M. V., 2011. Application of density modeling for solving the problem of the nature of the Bransfield Strait. Geofizicheskiy zhurnal 33(4), 142—152 (in Russian).

Kozlenko Yu. V., Korchagin I. N., Solovyev V.D., Chernyy A. V., Yakimchuk N. A., 1997. Gravimetric and magnetometric studies in the 60th Antarctic cruise of the IISP "Ernst Krenkel": results of geophysical observations and software -algorithmic development. Kiev: IGF NAS of Ukraine, 258 p. (in Russian).

Romashov A. N., 2003. Planet Earth: Tectonophysics and Evolution. Moscow: URSS Publ. Group, 261 p. (in Russian).

Udintsev G. B., Beresnev A. F., Kurentsova N. A., Kol'tsova A. V., Domoratskaya L. G., Shenke G. V., Ott N., Kenig M., Iokat V., Bakhmutov V. G., Solov'yev V. D., Levashov S. P., Yakimchuk N. A., Korchagin I. N., 2010. Drake Passage and Scotia Sea — the Ocean gates of the Western Antarctic. In: The structure and history of the development of the lithosphere. Moscow: Paulsen, P. 66—90 (in Russian).

Shpyra V. V., Bakhmutov V. G., Bakhmutova L. N., Gladkochub D. P., Koshelev A. V., Skarboviychuk T. V., Yakukhno V. I., 2014. Magnetic and density characteristics of igneous rocks near the Ukrainian antarctic station "Akademik Vernadsky". Ukrayinskyy antarktychnyy zhurnal (13), 81—93 (in Russian).

Burton-Johnson A., Riley T. R., 2015. Autochthonous vs. accreted terrane development of continental margins: a revised in situ tectonic history of the Antarctic Peninsula. J. Geol. Soc. 172(6), 822— 835. doi:10.1144/jgs2014-110.

Catalan M., Davila J. M., Galindo-Zaldivar J., Martos Y. M., Maldonado A., Gamboa L., Schreider A. A., 2013. Initial stages of oceanic spreading in the Bransfield Rift from magnetic and gravity data analysis. Tectonophysics 585, 102—112. doi: 10.1016/j.tecto.2012.09.016.

Civile D., Lodolo E., Vuan A., Loreto F. M., 2012. Tectonics of the Scotia-Antarctica plate boundary constrained from seismic and seismological data. Tectonophysics 550—553, 17—34. doi: 10.1016/j.tecto.2012.05.002.

Ferraccioli F., Jones P. C., Vaughan A. P., Leat P. T., Dean A., 2006. New aerogeophysical view of the Antarctic Peninsula: more pieces, less puzzle. Geophys. Res. Lett. 33(5), L05310. doi: 10.1029/2005GL024636.

Garrett S. W., 1990. Interpretation of reconnaissance gravity and aeromagnetic surveys of the Antarctic Peninsula. J. Geophys. Res. 95(B5), 6759—6777.

Ghidella M. E., Forsberg R., Greenbaum J. S., Olesen A. V., Zakrajsek A. F., Blankenship D. D., 2011. Magnetic anomaly data from a regional survey: from Ti- erra del Fuego to northern Palmer Land, Antarctic Peninsula. Latinmag Lett. 1, Special Issue, A19, 1—7.

Golynsky A., Golynsky D., Bell R., Blankenship D., Young D., Damaske D., Ferraccioli F., Finn C., Ivanov S., Masolov V., Jokat W., Riedel S., von Frese R., 2013. Air and shipborne magnetic surveys of the Antarctic into the 21st century. Tectonophysics 585, 3—12. doi: 10.1016/j.tecto.2012.02.017.

Golynsky A. V., Morris P., Kovac L. C., Ferris J. K., 2002. A new magnetic map of the Weddell Sea and the Antarctic Peninsula. Tectonophysics 347(1-3), 3—21. doi: 10.1016/S0040-1951(01)00234-7.

Golynsky A. V., Masolov V. N., 1999. Interpretation of ground and aeromagnetic surveys of Palmer Land, Antarctic Peninsula. Annali di Geofisica 42, 333—351.

Gracia E., Canals M., Farrаn M., Prieto M. J., Sorribas J., Team G., 1996. Morpho-structure and evolution of the Central and Eastern the Bransfield (NW Antarctic Peninsula). Mar. Geophys. Res. 18, 429—448. doi:10.1007/BF00286088.

Grad M., Guterch A., Janik T., 1993. Seismic structure of the lithosphere across the zone of subduced Drake Plate under the Antarctic Plate, West Antarctica. Geophys. J. Int. 115, 568—600.

Janik T., Guterch A., Sroda P., Grad M., 2014. The deep seismic structure of the Earth's crust along Antarctic Peninsula — A summary of the results from polish geodynamical expeditions. Global and Planetary Change 123(PA), 213—222. doi: 10.1016 /j.gloplacha.2014.08.018.

Johnson A. C., 1999. Interpretation of new aeromagnetic anomaly data from central Antarctic Peninsula. J. Geophys. Res. 104, 5031—5046.

Levashov S. P., Yakymchuk N. A., Korchagin I. N., Bakhmutov V. G., Solovyov V. D., Kozlenko Yu. V., 2008. Geophysical models of Drake Passage and Bransfield Strait crustal structure. Ukrainian Antarctic Journal (6), 9—14.

Lodolo E., Perez L. F., 2015. An abandoned rift in the southwestern part of the South Scotia Ridge (Antarctica): Implications for the genesis of the Bransfield Strait. Tectonics 34(12). doi: 10.1002/2015TC004041.

Maldonado A., Galindo-Zaldivar J., Lobo F. J., Martos Y. M., Perez L. F., Bohoyo F., Somoza L., Hernandez-Molina F. J., Lodolo E., Schreider A. A. et al., 2014. A model of oceanic development by ridge Jumping: Opening of the Scotia Sea. Global and Planetary Change 123, 152—173. doi: 10.1016/j/gloplacha.2014.06.010.

Maslanyj M. P., Garrett S. W., Johnson A. C. et al., 1991. Aeromagnetic anomaly map of West Antarctica, GEOMAP Series, Geophysical Map and Supplementary Text. British Antarctic Survey, Cambridge, p. 37.

Renner R. G. B., Sturgeon L. J. S., Garrett S. W., 1985. Reconnaissance gravity and aeromagnetic surveys of the Antarctic Peninsul. Brit. Antarct. Surv. Sci. Rep. 110. 50 p.

Soloviev V., Korchagin I., Levashov S., Bozhezha L. D., 2016. Central Basin of the Bransfield Strait: magnetic anomalies and the formation stages of the Antarctic Peninsula continental margin structures. 15th EAGE International Conference on Geoinformatics — Theoretical and Applied Aspects. Doi: 10.3997/2214-4609.201600452.

Storey B. C., Garrett S. W., 1985. Crustal growth of the Antarctic Peninsula by accretion, magmatism extension. Geological Magazine 122, 5—14.

Vaughan A. P. M., Wareham C. D., Johnson A. C., Kelley S. P., 1998. A Lower Cretaceous, syn-extensional magmatic source for a linear belt of positive magnetic anomalies: the Pacific margin anomaly (PMA), western Palmer Land, Antarctica. Earth Planet. Sci. Lett. 158(3-4), 143—155. doi: 10.1016/S0012-821X(98)00054-5.

Yegorova T., Bakhmutov V., 2013. Crust structure of the Antarctic Peninsula sector of the Gondwana margin around Anvers Island from geophysical data. Tectonophysics 585, 77—89. doi: 10.1016/j.tecto.2012.09.029.



How to Cite

Soloviev, V., & Korchagin, I. (2017). Magnetic anomalies and the features of geodynamic development of the Antarctic Peninsula continental margin structures. Geofizicheskiy Zhurnal, 39(3), 76–90.