Paleomagnetism of trap basalts in the northwestern Siberian craton, from core data

Mikhaltsov N.E.; Kazansky A.Y.; Ryabov V.V.; Shevko A.Y.; Kuprish O.V.; Bragin V.Y.

doi:10.1016/j.rgg.2012.09.009

Инд. авторы:	Mikhaltsov N.E., Kazansky A.Y., Ryabov V.V., Shevko A.Y., Kuprish O.V., Bragin V.Y.
Заглавие:	Paleomagnetism of trap basalts in the northwestern Siberian craton, from core data
Библ. ссылка:	Mikhaltsov N.E., Kazansky A.Y., Ryabov V.V., Shevko A.Y., Kuprish O.V., Bragin V.Y. Paleomagnetism of trap basalts in the northwestern Siberian craton, from core data // Russian Geology and Geophysics. - 2012. - Vol.53. - Iss. 11. - P.1228-1242. - ISSN 1068-7971. - EISSN 1878-030X.
Внешние системы:	DOI: 10.1016/j.rgg.2012.09.009; SCOPUS: 2-s2.0-84868275581;
Реферат:	eng: We present new paleomagnetic data for continental flood basalts (Siberian traps) obtained from cores of two boreholes in the northwestern Noril'sk area, within the Kharaelakh and Vologochan basins. Paleomagnetic measurements of lava and tuff samples from KhS-59 and SSV-19 boreholes allowed reconstructing and correlating the polarity patterns. Thus multiple paleomagnetic anomalies (PMA) have been discovered as brief polarity changes in narrow intervals of the magnetostratigraphic section above the principle reversal at the boundary between the Ivakin and Syverma Formations.The most prominent anomalies are observed at the bases of the Morongo and Mokulai Formations. The samples from the anomalous intervals differ from those of other intervals neither in rock magnetic properties, nor in mineralogy and magnetic grain sizes. Therefore, the revealed PMA record excursions of the geomagnetic field. Comparison of the results with the Meishan Global Stratotype Section and Point (GSSP) of the Permian-Triassic boundary implies a revision to the P-T position in the trap basalt succession of the Noril'sk area. Judging by the EMF behavior, basalts in this part of the trap province erupted for at least 500 kyr during an interval of stable normal polarity. © 2012.
Ключевые слова:	Siberian Craton; Russian Federation; Norilsk; Krasnoyarsk [Russian Federation]; Permian-Triassic boundary; paleomagnetism; magnetostratigraphy; magnetic anomaly; magmatism; Sugarcane streak virus; flood basalt; Trap magmatism; Trap basalts; Siberian craton; Permian-Triassic boundary; Paleomagnetism; Noril'sk area; Magnetostratigraphy; geomagnetic field;
Издано:	2012
Физ. характеристика:	с.1228-1242