DOI: https://doi.org/10.24028/gzh.0203-3100.v40i3.2018.137172

Three-dimensional Earth’s crust density model of the central part of the Golovanevsk suture zone of the Ukrainian Shield

V. I. Starostenko, P. Ya. Kuprienko, I. B. Makarenko, A. S. Savchenko, O. V. Legostaeva

Abstract


Three-dimensional Earth’s crust density model of the central part of the Golovanevsk suture zone of the Ukrainian Shield at the scale 1:50 000 has been given. Model calculations were carried out using automated complex GMT-Auto. The model takes into account the change in density both laterally in accordance with petrophysical data; and with depth in accordance with seismometry data. In this case; an abrupt change in the density in one direction or another; of the inversion zone and zone of constant density was taken into consideration. The density of rated bodies on the surface of the basement was defined based on the percentage ratio of the constituent rocks; in the depth — from the dependence of density on velocity. The block structure of the Earth’s crust upper part; which was previously revealed by seismometry in some areas of the zone; was confirmed. During the modeling it was found out that the structure of investigated territory in the density model from the surface to a depth of ³ 20 km is divided into the central; eastern and western parts. The central one; which corresponds to the most part of the Golovanevsk suture zone; is represented by rocks; whose density is much higher than in the western and especially in the eastern parts. The existence of essentially decompacted rocks in the eastern and northern parts of the zone to a depth of 10 km indicates the presence of granitization processes in the past. From the depth of 30 km and up to the Moho discontinuity two parts are distinguished: the western and the eastern. These parts are separated by a sharp submeridional stage in the Moho discontinuity from 46 to 55—65 km; which are traced along the center line of the Golovanevsk suture zone. The density of rocks is much higher in the western part both in area and with depth. The density distribution across the entire crustal section was obtained both in local structures with an abnormally high density on the surface of the basement (represented by gabbro amphibolites; ferruginous quartzites; crystal shales and gneiss garnet-biotite gneisses) and in the enclosing rocks. The performed calculations made it possible in the first approximation to determine the nature of the density variation with depth in the anomalous structures and to establish the depth of their propagation. According to preliminary data; these structures can be traced to a depth of 3—5 km.


Keywords


the Golovanevsk suture zone; density; Earth’s crust; structures with an abnormally high density on the surface of the basement

References


Geological map of the crystalline base of the scale of 1 : 200000. Sheet M-36-XXXI (Pervomaisk); 1990. Kiev: Foundation of GP “Ukrainian Geological Company” (in Russian).

Gintov O. B.; Yentin V. A.; Mychak S. V.; Pavlyuk V. N.; Zyultsle V. V.; 2016. Structural-petrophysical and tectonophysical base of geological map of crystalline basement of the central part of the Golovanevsk suture zone of the Ukrainian Shield. Geofizicheskiy zhurnal; 38(3); 3—28 (in Russian). https://doi.org/10.24028/gzh.0203-3100.v38i3.2016.107777.

Gintov O. B.; Orlyuk M. I.; Mychak S. V.; Bakarzhieva M. I.; Farfulyak L. V.; 2008. Subbotsko-Moshorinsky stage of the Earth’s crust deformation of the Ukrainian Shield. Geofizicheskiy zhurnal; 30(6); 23—38 (in Russian).

Entin V. A.; 1987. Geologist-structural features and prognosis estimation of resources of iron-ore deposit of Middle Bug area from geolog-geophisical data: Abstract of thesis for the degree of candidate of geol.-min. sci. Kiev; 32p. (in Russian).

Ilchenko T. V.; 2003a. The structure of the Earth’s crust and the uppermost mantle of the Kirovograd block of the Ukrainian Shield by DSS data (Babanka—Pyatikhatki and Cherkassy—Noviy Bug profiles). Geofizicheskiy zhurnal; 25(6); 30—43 (in Russian).

Ilchenko T. V.; 2003b. Structure of the crust and upper mantle of the Kirovograd block Ukrainian Shield according to the NHS (model Babanka—Piatihatki). Dopovidi NAN Ukrainy; (7); 100—106 (in Russian).

Korchin V. A.; Burtnyy P. A.; Kobolev V. P.; 2016. Zones of decompaction of the Earth’s crust of the central part of the Ukrainian Shield (ac-cording to materials of petrophysical and seismogravitational modeling). Geofizicheskiy zhurnal; 38(3); 84—99 (in Russian). https://doi.org/10.24028/gzh.0203-3100.v38i3.2016.107781.

Krasovsky S. S.; 1981. Reflection of the dynamics of the continental crust in the gravitational field. Kiev: Naukova Dumka; 261 p. (in Russian).

Kuprienko P. Ya.; Makarenko I. B.; Starostenko V. I.; Legostaeva O. V.; 2007a. Three-dimensional density model of the crust and upper mantle of the Ingul megablok of the Ukrainian Shield. Geofizicheskiy zhurnal; 29(2); 17—41 (in Russian).

Kuprienko P. Ya.; Makarenko I. B.; Starostenko V. L.; Legostaeva O. V.; 2007b. Three-dimensional density model of the crust and upper mantle of the Ukrainian Shield. Geofizicheskiy zhurnal; 29(5); 3—27 (in Russian).

Lebedev T. S.; Korchin V. A.; Savenko B. Ya.; Shapoval V. I.; Shepel S. I.; 1986. Physical properties of mineral matter under PG-conditions of the lithosphere. Kiev: Naukova Dumka; 200 p. (in Russian).

Chekunov A. V. (Ed.); 1988. The lithosphere of Central and Eastern Europe: geotraverse: IV; VI; VIII. Kiev: Naukova Dumka; 170 p. (in Russian).

Omelchenko V. D.; Tripolskiy A. A.; Nosenko A. B.; 2008. Velocity heterogeneities and the relief of Mokhorovichich discontinuity of the Ukrainian Shield. Geofizicheskiy zhurnal; 30(6); 113—126 (in Russian).

Pavlenkova N. I.; Buryanov V. B.; Gordienko V. V.; 1974. Generalized geophysical model of the Earth’s crust of certain geostructures in the Ukraine. Geofizicheskiy sbornik; (62); 16—28 (in Russian).

Starostenko V. I.; Legostaeva O. V.; Makarenko I. B.; Savchenko A. S.; 2015a. Software system for automated data interpretation of potential fields (GMT-Auto). Geofizicheskiy zhurnal; 37(1); 42—52 (in Russian). https://doi.org/10.24028/gzh.0203-3100.v37i1.2015.111322.

Starostenko V. I.; Kuprienko P. Ya.; Makarenko I. B.; Savchenko A. S.; Legostaeva O. V.; 2015b. Density heterogeneity of the Earth’s crust of the Ingul megablock of the Ukrainian Shield according to the data of three-dimensional gravity modeling. Geofizicheskiy zhurnal; 37(3); 3—21 (in Russian). https://doi.org/10.24028/gzh.0203-3100.v37i3.2015.111089.

Starostenko V. I.; Sharypanov V. M.; Sharypanov A. V.; Savchenko A. S.; Legostaeva O. V.; Makarenko I. B.; Kuprienko P. Ya.; 2016. Interactive software package Isohypse for three-dimensional geological and geophysical models; and its practical use. Geofizicheskiy zhurnal; 38(1); 30—42 (in Russian). https://doi.org/ 10.24028/gzh.0203-3100.v38i1.2016.107720.

Starostenko V. I.; Sharypanov V. M.; Savchenko A. S.; Legostaeva O. V.; Makarenko I. B.; Kuprienko P. Ya.; 2011. An automated interactive graphics process of geological and geophysical objects. Geofizicheskiy zhurnal; 33(1); 54—61 (in Russian). https://doi.org/10.24028/gzh.0203-3100.v33i1.2011.117325.

Scheme of deep lithosphere structure in South-Western part of Eastern-European platform in the scale 1 : 1 000 000; 1992. Ed. A. V. Chekunov. Kiev: Publ. of the State Committee for Geology of Ukraine (in Russian).

Tripolsky A. A.; Sharov N. V.; 2004. Structure of the Precambrian shields of the Earth lithosphere by seismic data. Petrozavodsk: Karelian Research Centrå RAS. 159 p. (in Russian).

Yaroshchuk M. A.; 1983. Iron ore formations of the Belotserkovsky-Odessa metallogenic zone (the western part of the shield). Kiev: Naukova Dumka; 224 p. (in Russian).

Artemieva I. M.; 2011. The lithosphere: an interdisciplinary approach. Cambridge: Cambridge University Press. 773 p.