Paleointensity determination on Neoarchaean dikes within the Vodlozerskii terrane of the Karelian craton |
| |
| Authors: | V V Shcherbakova N V Lubnina V P Shcherbakov G V Zhidkov V A Tsel’movich |
| |
| Institution: | 1.Borok Geophysical Observatory, Schmidt Institute of Physics of the Earth,Russian Academy of Sciences,Borok,Russia;2.Faculty of Geology,Moscow State University,Moscow,Russia;3.Kazan (Volga Region) Federal University,Kazan,Russia;4.Schmidt Institute of Physics of the Earth,Russian Academy of Sciences,Moscow,Russia |
| |
| Abstract: | The results of paleomagnetic studies and paleointensity determinations from two Neoarchaean Shala dikes with an age of ~2504 Ma, located within the Vodlozerskii terrane of the Karelian craton, are presented. The characteristic components of primary magnetization with shallow inclinations I = ?5.7 and 1.9 are revealed; the reliability of the determinations is supported by two contact tests. High paleointensity values are obtained by the Thellier–Coe and Wilson techniques. The calculated values of the virtual dipole moment (11.5 and 13.8) × 1022 A m2 are noticeably higher than the present value of 7.8 × 1022 A m2. Our results, in combination with the previous data presented in the world database, support the hypothesized existence of a period of high paleointensity in the Late Archaean–Early Proterozoic. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
