Results of gravity modeling of the central part of the Korsun-Novomyrhorod pluton (Ukrainian Shield)
DOI:
https://doi.org/10.24028/gj.v46i6.312203Keywords:
pluton, gabbro-anorthosite massif, upper crust, three-dimensional gravity modeling, inverse problem, selection methodAbstract
Three-dimensional gravity modeling of the Gorodishchen and Smilyan gabbro-anorthosite massifs, located in the central part of the Korsun’-Novomirgorod pluton (Ukrainian shield), was performed. A three-dimensional model of the upper crust of the research area was developed using maps of the anomalous gravity field of 1:200 000 scale, taking into account the results of detailed seismic studies by the methods of the RWM (reflected wave method) and CDP (common depth point). Differences in the structure of the intrusive complex of the anorthosite-rapakivi granite formation and the gneisses of the Ingulo-Ingulets series surrounding it were reflected in the seismic wave fields, which made it possible to determine the boundaries of the entire intrusive. For separating the basic rocks and rapakivi granites that differ in their density, three-dimensional gravity modeling was performed using computer technology of automated interpretation of geophysical data based on the trial and error method. For the geological objects parameterization, an approximation model is proposed, which is represented by a set of three-dimensional rod bodies.
In the process of solving the inverse problem, various criteria for local optimization of gravitaty field sources were implemented. Three different functionalswere calculated during the iterative process. It is proved that the joint use of the functionals allows to reduce various types of noise in the observed gravity data. During the solving the inverse problem we found out that using of various types of functionals in the algorithms of trial and error methods is quite appropriate.
Three-dimensional gravity modeling made it possible to identify and outline gabbro-anorthosite bodies in the upper part of the section with maximum thickness of up to 4—5 km, to clarify the shape and dimensions of the rapakivi granites, and to study the contacts of the intrusive complex with the gneisses surrounding it. The obtained model, which takes into account all the available information on density and geometric parameters of the anomaly forming objects, could be used to obtain additional reliable geological information about the structure of the Gorodishchensk and Smilyan gabbro-anorthosite massifs.
The reliability of this algorithm for three-dimensional trial and error gravity method, using an approximation model in the form of a three-dimensional rods construction, allows us to recommend it for the study of similar gabbro-anorthosite massifs of the Ukrainian Shield, primarily the Korosten pluton.
References
Bolyubakh, K.A. (1972). Deep structure of the central regions of the Ukrainian Shield. Kiev: Naukova Dumka, 96 p. (in Russian).
Bulakh, E.G. (2010). Direct and inverse problems of gravimetry and magnetometry. Kiev: Naukova Dumka, 463 p. (in Russian).
Bulakh, E.G., & Lapina, E.P. (2002). Inverse problems of magnetometry in the class of rod bodies in connection with the construction of an analytical model of the original field. Geofizicheskiy Zhurnal, 24(4), 67―74 (in Russian).
Bulakh, E.G., & Shinshin, I.V. (2000). Algorithmic and software solution to the problem of constructing an analytical model of the gravitational field. Geofizicheskiy Zhurnal, 22(2), 107―114 (in Russian).
Drogitskaya, G.M. (2012). Construction of a 3D seismic-geological model of the Kirovograd ore region based on the data of converted waves of earthquakes. In Theoretical and applied aspects of geoinformatics (pp. 39―50). Kyiv (in Russian).
Drogitskaya, G.M., & Shimkiv, L.M. (1986). Deep structure of the western part of the Korsun-Novomirgorod pluton according to seismic reflected waves and gravity modeling. Geofizicheskiy Zhurnal, 8(2), 76—82 (in Russian).
Ilchenko, T.V. (2003). The structure of the earth’s crust and upper mantle of the Kirovograd block of the Ukrainian shield according to the DSS data (Babanka―Pyatikhatka and Cherkassy―Novyi Bug profiles). Geofizicheskiy Zhurnal, 25(6), 30—42 (in Russian).
Kononov, Yu.V. (1966). Gabrovo massif of the Ukrainian Shield. Kyiv: Naukova Dumka, 98 p. (in Ukrainian).
Kononov, Yu.V. (1985). Metal content of gabbroic rocks of the Ukrainian Shield. Kiev: Naukova Dumka, 100 p. (in Russian).
Kryvdyk, S.G., Guravskyi, T.V., Dubyna, O.V., Bratchuk, O.M., Markhai, O.I., Nechayenko, O.M., & Yakubenko, P.F. (2009). Features of composition of apatite-ilmenite from Nosachiv deposit (Korsun-Novomyrgorod pluton, Ukrainian Shield). Mineralogical Journal, (3), 55―78 (in Ukrainian).
Kryuchenko, V.A., & Isanina, E.V. (1984). Experience of integrated interpretation of MOVZ materials and gravimetry in the central part of the Ukrainian shield. In Deep structure of the earth’s crust and upper mantle of Ukraine (pp. 16—26). Kiev: Naukova Dumka (in Russian).
Makarenko, I.V., Starostenko, V.I., Kuprienko, P.Ya., Savchenko, O.S., & Legostaeva, O.V. (2021). Heterogeneity of the earth’s crust of Ukraine and adjacent regions according to 3D gravity modeling. Kyiv: Naukova Dumka, 204 p. (in Ukrainian).
Мytrokhyn, O.V. (2011). Anothosite-rapakivi-granite association of Ukrainian Shield (geology, composition and origin). Extended abstract of Doctor’s thesis. Kyiv, 39 p. (in Ukrainian).
Mikheeva, T.L., Drogitska, G.M., & Lapina, O.P. (2023). Gravity modeling of ore gabbroids Korsun-Novomirhorod pluton. Geofizychnyi Zhurnal, 45(6), 127—140. https://doi.org/10. 24028/gj.v45i6.293311 (in Ukrainian).
Sollogub, V.B. (1986). The lithosphere of Ukraine. Kiev: Naukova Dumka, 184 p. (in Russian).
Sollogub, V.B., Grin, N.E., Gontovaya, L.I., & Drogitskaya, G.M. (1983). Deep seismic study of the consolidated crust using the reflected wave method. Geofizicheskiy Zhurnal, 5(2), 3—12 (in Russian).
Starostenko, V.I. (1978). Robust numerical methods in gravimetry problems. Kiev: Naukova Dumka, 228 p. (in Russian).
Tripolskiy, A.A., & Sharov, N.V. (2004). Lithosphere of the Precambrian shields of the northern hemisphere of the Earth according to seismic data. Petrozavodsk: Karelian Research Center RAS, 159 p. (in Russian).
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