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  Estonian Journal of Earth Sciences

ISSN 1736-7557 (electronic)  ISSN 1736-4728 (print)
An international scientific journal

Formerly: Proceedings of the Estonian Academy of Sciences, Geology
Published since 1952

Estonian Journal of Earth Sciences

ISSN 1736-7557 (electronic)  ISSN 1736-4728 (print)
An international scientific journal

Formerly: Proceedings of the Estonian Academy of Sciences, Geology
Published since 1952

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The Luusika potential field anomaly, eastern Estonia: modelling results; pp. 228–237

(Full article in PDF format) https://doi.org/10.3176/earth.2018.18


Authors

Marija Dmitrijeva, Jüri Plado, Tõnis Oja

Abstract

This study considers the anomalous gravity and magnetic fields in the Alutaguse petrological–structural domain, eastern Estonia. A 10 km wide local maximum (+6.26 mGal) Bouguer anomaly field was discovered at 58.96°N, 26.61°E from the ground gravity data by the Estonian Land Board in 2010–2011. The ground magnetic field intensity measurements indicated a positive magnetic anomaly of 600 nT, in addition to the local gravity maximum. Based on depth estimations, the centre of the anomaly source is placed at 2500–3000 m within the ~1.8 to 1.9 Ga Svecofennian basement. To provide information on the physical properties of the causative source of the anomalies, the geophysical modelling of potential fields was carried out by testing a number of lithologies as sources. The lithologies considered were the known post-orogenic and anorogenic magmatic intrusions in the Estonian basement, as well as typical metamorphic rocks of the Alutaguse domain. The obtained models indicate that the Luusika feature has a range of densities from 2760 to 2920 kg/m3 and magnetic susceptibilities from 20 000 × 10–6 to 56 000 × 10–6 SI. These models suggest that the Luusika causative source is an intermediate to the mafic rock unit, similar to post-orogenic or anorogenic massifs of the Svecofennian basement of Estonia.

Keywords

potential fields, magnetic susceptibility, density, Estonia, geophysical modelling, Alutaguse domain.

References

All , T. , Puura , V. & Vaher , R. 2004. Orogenic structures of the Precambrian basement of Estonia as revealed from the integrated modelling of the crust. Proceedings of the Estonian Academy of Sciences , Geology , 53 , 165–189.

Bogdanova , S. , Gorbachev , R. , Skridlaite , G. , Soesoo , A. , Taran , L. & Kurlovich , D. 2015. Trans-Baltic Palaeo­proterozoic correlations towards the reconstruction of supercontinent Columbia/Nuna. Precambrian Research , 259 , 5–33.
https://doi.org/10.1016/j.precamres.2014.11.023

Ellmann , A. , All , T. & Oja , T. 2009. Towards unification of terrestrial gravity data sets in Estonia. Estonian Journal of Earth Sciences , 58 , 229–245.
https://doi.org/10.3176/earth.2009.4.02

Ellmann , A. , Oja , T. & Jürgenson , H. 2011. Application of space technologies to improve geoid and gravity field models over Estonia. Geodeet , 41 , 22–25 [in Estonian].

Gromov , O. 1993. Sostavlenie gravimetricheskikh kart m-ba 1:50 000 i 1:200 000 i magnitometricheskoj karty m-ba 1:200 000 Severo-vostochnoj Éstonii [Report on Gravimetric (1:50 000) and Magnetic (1:200 000) Mapping of Northeastern Estonia]. Geological Survey of Estonia , Tallinn , 67 pp. [in Russian].

Kirs , J. , Puura , V. , Soesoo , A. , Klein , V. , Konsa , M. , Koppelmaa , H. , Niin , M. & Urtson , K. 2009. The crystalline basement of Estonia: rock complexes of the Palaeoproterozoic Orosirian and Statherian and Mesoproterozoic Calymmian periods , and regional correlations. Estonian Journal of Earth Sciences , 58 , 219–228.
https://doi.org/10.3176/earth.2009.4.01

Koistinen , T. , Klein , V. , Koppelmaa , H. , Korsman , K. , Lahtinen , R. , Nironen , M. , Puura , V. , Saltikova , T. , Tikhomirov , S. & Yanovskiy , A. 1996. Paleoproterozoic Svecofennian orogenic belt in the surroundings of the Gulf of Finland. In Explanation to the Map of Precambrian Basement of the Gulf of Finland and Surrounding Area 1:1 Million (Koistinen , T. , ed.) , Geological Survey of Finland , Special Paper , 21 , 21–57.

Koppelmaa , H. 2002. Geological Map of the Crystalline Basement of Estonia. Scale 1:400 000. Explanation to the Map Estonian Version. Geological Survey of Estonia , Tallinn , 32 pp. [in Estonian].

Koppelmaa , H. & Kivisilla , J. 1998. Geological Map of the Crystalline Basement of Northern Estonia. Scale 1:200 000. Explanation to the Map. Geological Survey of Estonia , Tallinn , 33 pp.

Laitakari , I. , Rämö , T. , Suominen , V. , Niin , M. , Stepanov , K. & Amantov , A. 1996. Subjotnian: rapakivi granites and related rocks in the surroundings of the Gulf of Finland. In Explanation to the Map of Precambrian Basement of the Gulf of Finland and Surrounding Area 1:1 Million (Koistinen , T. , ed.) , Geological Survey of Finland , Special Paper , 21 , 59–97.

Maasik , V. & Sildvee , H. 1965. Eesti NSV territooriumi maakoore vertikaal-liikumiste uurimine gravimeetrilise meetodiga [The Study of Vertical Movements of the Crust of the Estonian SSR Territory by the Gravimetric Method]. Geological Survey of Estonia , Tallinn , 17 pp. [in Estonian].

Melitskaya , V. I. & Papko , A. M. 1992. Otchet o rezul´tatakh aeromagnitnoj s´´emki masshtabov 1:25 000 , 1:50 000 na territorii Éstonii i prilegayushtshego shelfa , provedennoj partiei nr. 49 v 1987–1991 gg. [The Results of Aero­magnetic Mapping by Working Group No. 49 at Scales of 1:25 000 and 1:50 000 on Estonian Territory 1987–1991. Report of Investigation]. Geological Survey of Belarus , Minsk , 75 pp. [in Russian].

Niin , M. 1997. Svecofennian granitoids of the crystalline basement of Estonia; classification on the basis of geological structure , mineral and chemical composition. Bulletin of the Geological Survey of Estonia , 7 , 4–40.

Oja , T. 2011. The uplift of the gravity anomaly field near Luusika and its impact on geoid. Geodeet , 41 , 26–30 [in Estonian].

Oja , T. 2012. Gravity system and network in Estonia. In Geodesy for Planet Earth , Proceedings of the IAG2009 (Kenyon , S. , Pacino , M. C. & Marti , U. , eds) , International Association of Geodesy Symposia , 136 , 315–322.
https://doi.org/10.1007/978-3-642-20338-1_38

Oja , T. , Türk , K. , Ellmann , A. , Gruno , A. , Bloom , A. & Sulaoja , M. 2011. Relative gravity surveys on ice-covered water bodies. In Environmental Engineering , The 8th International Conference , May 19–20 , 2011 , Vilnius , pp. 1394–1401.

Pesonen , L. J. , Torsvik , T. H. , Elming , S.-Ǻ. & Bylund , G. 1989. Crustal evolution of Fennoscandia – palaeo­magnetic constrains. Tectonophysics , 162 , 27–49.
https://doi.org/10.1016/0040-1951(89)90355-7

Petersell , V. , Talpas , A. & Põldvere , A. 1985. Otchet ob izuchenii zhelezorudnykh formatsii v dokembrii Éstonii [An Investigation of Iron Ore Formations in the Precambrian of Estonia]. Geological Survey of Estonia , Tallinn , 129 pp. [in Russian].

Puura , V. & Flodén , T. 2000. Rapakivi-related basement structures in the Baltic Sea area; a regional approach. GFF , 122 , 257–272.
https://doi.org/10.1080/11035890001223257

Puura , V. , Klein , V. , Koppelmaa , H. & Niin , M. 1997. Pre­cambrian Basement. In Geology and Mineral Resources of Estonia (Raukas , A. & Teedumäe , A. , eds) , pp. 27–34. Estonian Academy Publishers , Tallinn.

Puura , V. , Vaher , R. , Klein , V. , Koppelmaa , H. , Niin , M. , Vanamb , V. & Kirs , J. 1983. Kristallicheskij fundament Éstonii [The Crystalline Basement of Estonian Territory]. Nauka , Moscow , 208 pp. [in Russian , with extended English summary].

Sharma , P. V. 1976. Geophysical Methods in Geology. Elsevier , Amsterdam , 428 pp.

Smith , R. A. 1959. Some depth formulae for local magnetic and gravity anomalies. Geophysical Prospecting , 7 , 55–63.
https://doi.org/10.1111/j.1365-2478.1959.tb01453.x

Smith , R. A. 1960. Some formulae for interpreting local gravity anomalies. Geophysical Prospecting , 8 , 607–613.
https://doi.org/10.1111/j.1365-2478.1960.tb01736.x

Smith , W. H. F. & Wessel , P. 1990. Gridding with continuous curvature splines in tension. Geophysics , 55 , 293–305.
https://doi.org/10.1190/1.1442837

Soesoo , A. , Puura , V. , Kirs , J. , Petersell , V. , Niin , M. & All , T. 2004. Outlines of the Precambrian basement of Estonia. Proceedings of the Estonian Academy of Sciences , Geology , 53 , 149–164.

 
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Current Issue: Vol. 68, Issue 3, 2019




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