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New paleomagnetic data on Paleoproterozoic complexes of the Central Karelian and Vodlozero terranes of the Karelian Craton were obtained. A new key paleomagnetic pole (1.98 Ga) was calculated for rocks of the Vodlozero terrane. The positions of Central Karelian and Vodlozero terranes 1.98 Ga ago in subtropical and moderate latitudes of the Northern Hemisphere, respectively, were reconstructed. The latitudinal difference (1.98 Ga) between the positions of Central Karelian and Vodlozero terranes supports the existence of oceanic basins between separate terranes of the Karelian Craton. 相似文献
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Lebedev I. E. Tikhomirov P. L. Pasenko A. M. Eid B. Lhuillier F. Pavlov V. E. 《Izvestiya Physics of the Solid Earth》2021,57(2):232-246
Izvestiya, Physics of the Solid Earth - Abstract—Paleomagnetic studies of several Late Cretaceous volcanic sections of the Okhotsk–Chukotka volcanic belt have been carried out in the... 相似文献
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N. V. Lubnina A. M. Pasenko M. A. Novikova A. Yu. Bubnov 《Moscow University Geology Bulletin》2016,71(1):8-17
Reliable paleomagnetic poles were calculated for 1.80–1.78 and 1.76–1.75 Ga as a result of the detailed paleomagnetic studies of the Late Paleoproterozoic igneous complexes and the North Ladoga region and Onega structure of the East European craton. According to the new paleomagnetic data, the final assembly of the Superior and Fennoscandia cratons in structure of the Paleoproterozoic Nuna/Columbia supercontinent began at 1.80–1.78 Ga and led to the formation of the Hudsonland megacontinent. Comparison of the coeval poles of 1.76–1.75 Ga of Fennoscandia and Volga–Sarmatia allows reconstruction of the oblique collision among these segments of the East European craton and substantiation of the final assembly at ~1.70 Ga. 相似文献
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N. V. Lubnina O. B. Gintov I. K. Pashkevich A. M. Pasenko 《Moscow University Geology Bulletin》2012,67(3):168-175
As a result of paleomagnetic investigations the positions of Devonian magmatic complexes of the Ukrainian shield (Sarmatia) in the tropical latitudes of the Southern Hemisphere in the Late Devonian were reconstructed. The moderate-temperature magnetization components in complexes of different ages of the Ukrainian Shield and recorded manifestations of the Devonian tectonomagmatic events were determined. 相似文献
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Doklady Earth Sciences - A paleomagnetic study of the Chertovskii Horizon of the Moyero River valley was carried out. Based on published and newly obtained data, the sequence of seven reliable... 相似文献
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Tikhomirov P. L. Lebedev I. E. Pasenko A. M. Lhuillier F. J. L. Alekseev D. V. Pavlov V. E. 《Doklady Earth Sciences》2021,501(2):1038-1042
Doklady Earth Sciences - New U–Pb and 40Ar/39Ar isotopic dates on volcanic rocks of the East Chukotka segment of the Okhotsk–Chukotka Belt correspond to 76–71 Ma span, which is... 相似文献
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V. E. Pavlov A. M. Pasenko A. V. Shatsillo V. I. Powerman V. V. Shcherbakova S. V. Malyshev 《Izvestiya Physics of the Solid Earth》2018,54(5):782-805
Representative paleomagnetic collections of Lower Cambrian rocks from the northern and eastern regions of the Siberian platform are studied. New evidence demonstrating the anomalous character of the paleomagnetic record in these rocks is obtained. These data confidently support the hypothesis (Pavlov et al., 2004) that in the substantial part of the Lower Cambrian section of the Siberian platform there are two stable high-temperature magnetization components having significantly different directions, each of which is eligible for being a primary component that was formed, at the latest, in the Early Cambrian. The analysis of the world’s paleomagnetic data for this interval of the geological history shows that the peculiarities observed in Siberia in the paleomagnetic record for the Precambrian–Phanerozoic boundary are global, inconsistent with the traditional notion of a paleomagnetic record as reflecting the predominant axial dipole component of the geomagnetic field, and necessitates the assumption that the geomagnetic field at the Proterozoic–Phanerozoic boundary (Ediacaran–Lower Cambrian) substantially differed from the field of most of the other geological epochs. In order to explain the observed paleomagnetic record, we propose a hypothesis suggesting that the geomagnetic field at the Precambrian–Cambrian boundary had an anomalous character. This field was characterized by the presence of two alternating quasi-stable generation regimes. According to our hypothesis, the magnetic field at the Precambrian–Cambrian boundary can be described by the alternation of long periods dominated by an axial, mainly monopolar dipole field and relatively short epochs, lasting a few hundred kA, with the prevalence of the near-equatorial or midlatitude dipole. The proposed hypothesis agrees with the data obtained from studies of the transitional fields of Paleozoic reversals (Khramov and Iosifidi, 2012) and with the results of geodynamo numerical simulations (Aubert and Wicht, 2004; Glatzmayer and Olson, 2005; Gissinger et al., 2012). 相似文献
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