Pages: 45 - 50
Authors: MARINA ORLOVA
Abstract: Detailed paleomagnetic studies of Middle-Upper Devonian sedimentary and volcanic rocks from the zone of the junction of the Donbass with the Near-Azov block of the Ukrainian Shield have detected the following main components of natural remanent magnetization: B-metachronic component (R-polarity) whose nature is secondary on the basis of the data of statistical tests (before and after tectonic correction) and magnetic-mineralogical studies: A1 and A2 - synchronous (N and R-polarity) is interpreted as having been acquired during deposition. The southern paleomagnetic pole calculated from mean directions the B-component (Lat.= -36° Long.= 338°, d=6.6°, dm =3.4°) agrees well with the paleomagnetic poles of Permian sediments of the Donets Basin. The paleopoles calculated from A1 (Middle Devonian) and A2 (Upper Devonian) components have the following coordinates: A1 (Lat. = 13°, Long. = 289°, dp = 9.8°, dm = 4.9°) and A2 (Lat. = -3.7°, Long. = 359°, dp = 4.7°, dm = 2.3°). The significant deviation of paleopoles A1 and A2 from the Eifel-Famenian segment of APWP for Baltica may reflect the effect of the local tectonic rotation of the block enclosing the rocks studied.
Keywords: Middle–Upper Devonian rocks, magnetization components, paleomagnetic polesDownload PDF document Show Text Version