GEOPHYSICAL RESEARCH, 2019, vol. 20, no. 2, pp. 5-18. https://doi.org/10.21455/gr2019.2-1

UDC 550.34.09

Abstract  References   Full text (in Russian)

INVESTIGATION OF LITHOSPHERIC MAGNETIC ANOMALIES OF THE GREENLAND-ICELAND-FAROE RIDGE COMPLEX ON MEASUREMENTS OF THE CHAMP SATELLITE

D.Yu. Abramova(1), L.M. Abramova(2), Iv.M. Varentsov(2), S.V. Filippov(1)

(1) Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation, Russian Academy of Sciences, Moscow, Troitsk, Russia

(2) Geoelectromagnetic Research Centre, Shmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Troitsk, Russia

Abstract. The distribution of the field of regional lithospheric magnetic anomalies above the Greenland-Iceland-Faroe ridge complex (GIFRC) which is part of the North Atlantic igneous province, one of the largest magmatic provinces in the world, is analyzed. The data were obtained from measurements of geomagnetic field made by the low-flying German CHAMP satellite, when its altitude significantly decreased.

To isolate the part associated with the field of lithospheric magnetic anomalies, a special original technology of separating the field parts from the total volume of the CHAMP satellite records determined by the presence of deep sources of regional anomalies was developed. Database of experimental data of the absolute induction vector module Ta of the anomalous lithospheric magnetic field at satellite altitude was created.

Maps of different scales for the anomalous lithospheric magnetic field at an altitude of 280 km above the Greenland-Iceland-Faroe ridge complex were constructed. In their construction, various types of median averaging blocks of size 80´80 km and 10´10 km by means of GMT were used. The relations between the identified lithospheric magnetic anomalies with the structures of the studied magmatic province and the active tectonic processes occurring in it up to the present day were discussed. The vast area of negative values of the anomalous magnetic field, observed at an altitude of 280 km, reflects the superposition of the spreading of the Mid-Atlantic Ridge and magmatic processes occurring in this zone, not only directly along the axis of the ridge, but also along its peripheral branches.

The traced positive magnetic anomalies, apparently, fix the presence of separate fragments of the ancient continental crust, submerged under the powerful structures of the basaltic base.

The maps of the anomalies of Ta magnetic field at an altitude of 280 km above the territory of the GIRF volcanic complex show a good agreement with the active tectonic processes taking place in this region.

Keywords: satellite measurements, lithospheric magnetic anomalies, Greenland-Iceland-Faroe ridge complex (GIFRC), spreading, mantle plume, old continental crust.

References

Abramova D.Yu., Abramova L.M. Lithospheric magnetic anomalies in the territory of Siberia (from measurements by the CHAMP satellite), Russian Geology and Geophysics, 2014, vol. 55, pp. 854-863.

Abramova D.Yu., Abramova L.M., Varentsov Iv.M., Filippov S.V. Analysis of lithospheric magnetic field anomalies within the framework of geological and geophysical studies of the crust-mantle structures of the Carpathian-Balkan region, Geophysics, 2017, no. 2, pp. 71-78.

Abramova D.Yu., Abramova L.M., Varentsov Iv.M., Filippov S.V. The role of satellite lithospheric magnetic anomalies in the analysis of geological and geophysical data in the Central Asian collision zone, Problems of geodynamics and geoecology of intracontinental orogens, Proceedings of the VI International Symposium, Bishkek: NS RAS, 2015, pp. 45-54.

Allen R., Nolet G., Morgan W., Vogfjord K., Nettles M., Ekstrom G., Bergsson B., Erlendsson P., Foulger G., Jakobsdottir S., Julian B., Pritchard M., Ragnarsson S., Stefansson R. Plume-driven plumbing and crustal formation in Iceland, J. Geophys. Res., 2002, vol. 107. ESE 4-1–ESE 4-19, https://doi.org/10.1029/ 2001JB000584

Alvey A., Gaina C., Kusznir N.J., Torsvik T.H. Integrated crustal thickness mapping and plate reconstructions for the high Arctic, Earth Planet. Sci. Lett., 2008, vol. 27, pp. 310-321.

Arkani-Hamed J., Langel R.A., Purucker M.E. Magnetic anomaly maps of Earth derived from POGO and Magsat data, J. Geophys. Res. 1994, vol. 99, pp. 24075-24090.

Artyushkov E.V. Continental crust in the Lomonosov ridge, Mendeleev ridge, and Makarov basin. The formation of deep-waterbasins in the Neogene, Russian Geology and Geophysics, 2010, vol. 51, no. 11, pp. 1515-1530.

Bijwaard H., Spakman W. Tomographic evidence for a whole-mantle plume below Iceland, Earth Planet. Sci. Lett., 1999, vol. 166, pp. 121-126.

Boðvarsson, G., Walker, G.P.L. Crustal drift in Iceland, Geophysical Journal of the Royal Astronomical Society. 1964, vol. 8, pp. 285-300, https://doi.org/10.1111/j.1365-246X.1964.tb06295.x

Brooks, C.K. Rifting and Doming in Southern East Greenland, Nature Physical Science, 1973, vol. 244, pp. 3.

Dahl-Jensen, T., Larsen T.B., Woelbern I., Bach T., Hanka W., Kind R., Gregersen S., Mosegaard K., Voss P., Gudmundsson O., Depth to Moho in Greenland: Receiver-function analysis suggests two Proterozoic blocks in Greenland, Earth Planet. Sci. Lett., 2003, vol. 205, pp. 379-393.

Fitton, J.G., Saunders, A.D., Norry, M.J., Hardarson, B.S. & Taylor, R.S. Thermal and chemicalstructure of the Iceland plume, Earth Planet. Sci. Lett., 1997, vol. 153, pp. 197-208.

Foulger, G.R., Anderson, D.L. A cool model forthe Iceland hotspot, Journal of Volcanology and Geothermal Research, 2005, vol. 141, pp. 1-22.

Funck,T., Hopper, J.R. Crustal structure. Tectonostratigraphic Atlas of the North-East Atlantic Region. Geological Surv. of  Denmark and Greenland (GEUS). Copenhagen, Denmark, 2014, pp. 69-128.

Gaina, C., Gernigon, L. and Ball, P. Palaeocene–Recent plate boundaries in the NE Atlantic and the formation of the Jan Mayen microcontinent, Journal of the Geological Society, London, 2009, vol. 166, pp. 601-616, https://doi.org/10.1144/0016-76492008-112

Golovkov, V.P., Zvereva, T.I., Chernova, T.A., Space–time modeling of the main magnetic field by combined methods of spherical harmonicanalysis and natural orthogonal components, Geomagnetism and Aeronomy, 2007, vol. 47, no. 2, pp. 256-262.

Haase, C., Ebbing, J. and Funck, T. A 3D crystal model of the NE Atlantic based on seismic and gravitydata, eds. G. Peron-Pinvidic, J.R. Hopper, T. Stoker, C. Gaina, H. Doornebal, T. Funck, U. Arting, The NE Atlantic Region: A Reappraisal of Crystal Structure, Tectonostratigraphy and Magmatic Evolution, Geological Society, London, Special Publications, 2016, vol. 447, no. 12, https://doi.org/10.1144/SP447.8/

Hemant K., Maus S., Haak V., Interpretation of CHAMP crustal field anomaly maps using a geographical information system (GIS) technique, Earth Observation with CHAMP: Results from Three Years in Orbit, 2005, pp. 249-254.

Hemant, K., Maus, S. Geological modeling of the new CHAMP magnetic anomaly maps using a geographical information system technique, J. Geophys. Res., 2005, vol. 110, pp. 1-23.

Henriksen N., Higgins A.K., Kalsbeek F., Pulvertaft T.C.R., Greenland from Archaean to Quaternary. Descriptive text to the Geological map of Greenland 1:2 500 000, Geology of Greenland Survey Bull., 2000, vol. 185, pp. 93.

Hjartarson A., Erlendsson O., Blisghke A. The Greenland–Iceland–Faroe Ridge Complex, Geological Society London Special Publications. April 2017, 21 p.

Hjartarson, A., Sæmundsson, K. Geological Map of Iceland. Bedrock. 1:600 000. Iceland Geo-Survey (I´SOR). Reykjavik, Iceland, 2014.

Jakovlev A.V., Bushenkova N.A., Koulakov I.Yu., and Dobretsov N.L. Structure of the upper mantle in the Circum-Arctic region from regional seismic tomography, Russian Geology and Geophysics, 2012, vol. 53, pp. 1261-1272.

Kontorovich A.E., Epov M.I., Burshtein L.M., Kaminskii V.D., Kurchikov A.R., Malyshev N.A., Prischepa O.M., Safronov A.F., Stupakova A.V., Suprunenko O., Geology and hydrocarbon resources of the continental shelf in Russian Arctic seas and the prospects of their development, Russian Geology and Geophysics, 2010, vol. 51, no. 1, pp. 7-17.

Korotaev S.M., Zhdanov M.S., Orekhova D.A., Kruglyakov M.S., Trofimov I.L., Shneer V.S., Shchors Yu.G. Perspectives of magnetotelluric sounding on some large structures of the Arctic Ocean, Izvestiya, Physics of the solid Earth, 2010, no. 9, pp. 48-54.

Langel R.A., Hinze W.J. The Magnetic Field of the Earth’s Lithosphere: The Satellite Perspective. Cambridge Univ. Press. U. K.: Cambridge, 1998.

Larsen, L.M., Watt, W.S. Episodic volcanism during break-up of the North Atlantic: evidence from the East Greenland plateau basalts, Earth Planet. Sci. Lett., 1985, vol. 73, pp. 105-116, https://doi.org/10.1016/ 0012-821X(85)90038-X

Morgan, W.J. Convection plumes in the lower mantle, Nature, 1971, vol. 230, pp. 42-43.

Pechersky, D.M., Genshaft, Yu.S., Petromagnetism of the continental lithosphere and the origin of regional magnetic anomalies: A review, Russ. J. Earth Sci., 2001, vol. 3 (2), http://elpub.wdcb.ru/ journals/rjes/rus/v03/rje01059/rje1059.htm

Porokhova L.N., Abramova D.Yu., Porokhov D.A. Mantle electrical conductivity models, constructed by effective linearization using global terrestrial and satellite data, Geomagnetism and Aeronomy, 1996, vol. 34, no. 5, pp. 137-146.

Reigber, C., Lühr, H., Schwintzer, P. CHAMP mission status, Adv. Space Res., 2002, vol. 30 (2), pp. 129-134.

Rickers F., Fichtne A., Trampert J. The Iceland–JanMayen plume system and its impact on mantle dynamics in the North Atlantic region, Earth Planet. Sci. Lett., 2013, vol. 367, pp. 39-51.

Rotanova N.M., Kharitonov A.L., Frunze A.H., Filippov S.V., Abramova D.Yu. Anomalous magnetic fields from CHAMP satellite measurements for the Kursk magnetic anomaly territory, Geomagnetism and Aeronomy, 2005, vol. 45, no. 5, pp. 712-719.

Saunders, A.D., Fitton, J.G., Kerr, A.C., Norry, M.J., Kent, R.W. The North Atlantic igneous province, eds. Mahoney, J.J. & Coffin, M.F., Large Igneous Provinces. American Geophysical Union, Geophysical Monograph, 1997, vol. 100, pp. 45-93.

Søager, N. & Holm, P.M. Extended correlation of the Paleogene Faroe Islands and East Greenland plateau basalts, Lithos, 2009, vol. 107, pp. 205-215, https://doi.org/10.1016/j.lithos.2008.10.002.

Thordarson, T., Larsen, G. Volcanism in Icelandin historical time: Volcano types, eruption styles and eruptive history, Journal of Geodynamics, 2007, vol. 43, pp. 118-152.

Torsvik, T.H., Amundsen, H.E.F. Continental crust beneath southeast Iceland, Proceedings of the National Academy of Sciences of the United States of America, 2015, vol. 112, pp. 1818-1827.

Wessel, P., Smith, W.H.F., The Generic Mapping Tools. Technical Reference and Cookbook Version 4.2, 2007. gmt.soest.hawaii.edu

White, R., McKenzie, D. Magmatism at rift zones: the generation of volcanic continental margins and flood basalts, J. Geophys. Res., 1989, vol. 94, pp. 7685-7729.