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About the results of the magnetotelluric sounding of central part of the Srednepridneprovsky megablock

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Category: Geology

Last Updated on 16 May 2013

Published on 15 November 2012

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Authors:

P.I. Pigulevskiy, Cand. Sci. (Geol.), Senior Research Fellow, State Higher Educational Institution “National Mining University”, Senior Lecturer of the Department of Geophysical Methods of Exploration, Dnipropetrovsk, Ukraine

Abstract:

Purpose. To examine deep structure of central part of the Srednepridneprovsky Megablok of the Ukrainian shield by audiomagnetoteluric and magnetoteluric methods to distinguish between different parts of Earth’s crust for mineral prediction technology improvement.

Methodology. Observations were carried out by means of equipment “V-5 System 2000” provided by Canadian company Phoenix Geophysics Limited. Stable values of the impedance tensor, a matrix of the Visa-Parkinson and sections of apparent resistance to depth of 200 km were received.

Findings. The vertical differentiation of the lithosphere by effective resistance values and changes of geoelectric anomaly courses from horizontal to essentially inclined, was done. Thus visible vertical capacity of layers of the geoelectric discontinuity increases with depth, and at crossing in the upper mantle (lower of section of the Moho) their borders become less clear. At a depth of 100 km the form of the geoelectric anomalies becomes oval or isomeric, that can be caused by presence of small chambers of the partially melted material.

Originality. For the first time Earth’s crust vertical differentiation and lithosphere capacity within central part of the Srednepridneprovsky Megablok was established as a result of interpretation of audiomagnetoteluric and magnetoteluric data, gravimetry and magnetometry. Cross-section of lithosphere of 160–180 km depth was examined by magnetoteluric method. Lithospheric and mantle conductive layers were established. They serve as indicators of the modern thermodynamic state of the Megablok. Their parameters present geothermal mode of the region.

Practical value. The obtained results can be useful for precious and base metals prospecting.

References:

1. Бородулин М.И. Модели литосферы Украинскогощита по материалам ОГТ / Бородулин М.И., Байсарович М.Н. // Геофиз. журн., – К., 1992. – 14, №4. – С. 57–66.

Borodulin, M.I. and Baysarovich, M.N. (1992), “Models of the lithosphere of Ukrainian shield by the CDP data”, Geofizicheskiy Zhurnal, 14, no.4, pp. 57–66.

2. Соллогуб В.Б. Литосфера Украины. / Соллогуб В.Б. – К.: Наук. думка, 1986. – 184с.

Sollogub, V.B. (1986), Litosfera Ukrainy [Lithosphere of Ukraine], Naukova dumka, Kyiv, Ukraine.

3. Ингеров А.И. Электромагнитные исследования в юго – западной части геотраверса „Гранит“. Методика и результаты исследований / Ингеров А.И., Ганоцкий О.В., Бугримов Л.П. // Геофиз. сб., – Свердловск; 1991. – №1. – С. 68–73.

Ingerov, A.I., Ganotskiy, O.V. and Bugrimov, L.P. (1991), “Electromagnetic investigations at the south-west part of geotraverse “Granit”. The methodic and results of the study”, Geofizicheskiy sbornik, no.1, pp. 66–73.

4. Дьяконова А.Г. Электромагнитное зондирование на Восточно-Европейской платформе и Урале / Дьяконова А.Г., Ингеров А.И., Рокитянский И.И. – К.: Наук. Думка, 1986. – 140 с.

Dyakonova, A.G., Ingerov, A.I. and Rokityanskiy, I.I. (1986), Elektromagnitnoe zondirovaniye na Vostochno-Evropeyskoy platforme i Urale [Electromagnetic Sounding at the East European Platform and Urals], Naukova dumka, Kyiv, Ukraine.

5. Пигулевский П.И. Связь структурных элементов Приазовского геоблокa Украинского шита с геоэлектрической моделью раздела Мохоровичича / Пигулевский П.И., Берзенин Б.З., Насад А.Г. // Сб. научн. трудов НГА Украины. №6. Том 3. Геофизика, – Днепропетровск, 1999. – С. 138–142.

Pigulevskiy, P.I., Berzenin, B.Z. and Nasad, A.G. (1999), “The relations between structure elements of Priazovsky geoblock of Ukrainian shield and geological model of the section Moho”, Sbornik Nauchnykh Trudov NGA Ukrainy, Series Geophysics, Vol. 3, no.6, pp. 138–142.

6. Францессон Е.В. Кимберлитовый магматизм древних платформ / Францессон Е.В., Лутц Б.Г. – М., 1995. – 340 с.

Frantsensson, Ye.V. and Lutts, B.G. (1995), Kimberlitovyi magmatism drevnikh platform [The Kimberlite Magmatism of the Ancient Platforms], Nedra, Moscow, Russia.

7. Специус З.В. Состав континентальной верхней мантии и низов коры под Сибирской платформой / Специус З.В., Серенко В.П. – М., 1990. – 272 с.

Spetsius, Z.V. and Serenko, V.P. (1990), Sostav kontinentalnoy verkhney mantii i nizov kory pod Sibirskoy platformoy [Content of the Continental Upper Mantle and Bottom of the Crust Under the Siberian Platform], Nedra, Moscow, Russia.

8. Критерии рудоностности и металогения областей субдукции Украинского щита / [Шеремет Е.М., Кулик С.Н., Кривдик С.Г., Пигулевский П.И., Бурахович Т.К., Загнитко В.Н. и др.] – Донецк: Ноулидж, 2011. – 286 с.

Sheremet, Ye.M., Kulik, S.N., Krivdik, S.G., Pigulevskiy, P.I., Burakhovich, T.K. and Zagnitko, V.N. (2011), Kriterii rudonosnosti i metallogeniya oblastey subduktsyi Ukrainskogo shchita [The Criteria For Ore and Metallogeny of the Subduction Zones of the Ukrainian Shield], Noulidzh, Doneck, Ukraine.

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