Paleomagnetic and rock magnetic study of Lower Devonian red beds from Podolia: remagnetization problems

Results of paleomagnetic studies of red bed Early Devonian deposits of Podolia, which make the Dniester series (southwestern Ukraine, the Dniester basin) have been given. As a result two components of natural remanent magnetization have been subdivided in addition to viscous one. The first one has got south-southwestern declination and negative inclination, it is identified in almost all samples within the limits of deblocking temperatures from 150—200°С to 530—630°С. Its corresponding paleomagnetic pole (47°S, 351,5°E) is close to the Permian fragment of APWP for the Baltic/Stabile Europe. Its bearers are newly-formed magnetic minerals (secondary authigenous hematite), responsible for production of “late” chemical magnetization. The second component is subdivided in some samples within the limits from 590—610°С to 680—690°С, it has got southwestern declination and positive inclination. Its corresponding paleomagnetic pole (2.3°S, 338.4°E) is drawn towards Early Devonian fragment of APWP This component is caused by presence of detritic grains of hematite. There are solid grounds for consideration of this magnetization to be primary one, which reflects the direction of the Devonian field. New results are in good agreement with paleomagnetic directions obtained earlier in this area for red beds and grey beds of Early Devonian

Paleomagnetic studies of the Lower Devonian gray deposits of Podolia

New results of paleomagnetic studies of Lower Devonian sediments from the southwest of Ukraine (the Podolia area, the Dniester river basin) have been presented. The samples are grey limestone and dolomite of Tiverian series comparable with the Lochkovian stage of the Geological time scale. Stable component of magnetization of the most samples indicate to remagnetization of rocks (the Permian pole, ϕ=45qS, λ=340qE, dp/dm=2q/5q). In some samples of the Ivanev suite the primary component of magnetization (Lower Devonian direction) has been distinguished. Paleomag-netic pole (ϕ=0q, λ=329qE, dp/dm=10q/12q) is in a good agreement with Lower Devonian fragment of apparent wander path for the Baltica. The results are in agreement with earlier data of authors for Silurian gray sedimentary rocks of Podolia

New results of paleomagnetic studies of red-colored Silurian deposits

New results of paleomagnetic studies of red-colored rocks of the Late Silurian of southwestern Ukraine (Podolian area, the Dniester river basin) have been presented. Sedimentary unit of red-colored deposits as a part of upperconovsk subsuite of Malinovets series are represented by dolomites comparable with Ludford stage of the International geological scale, and was studied in two sections. The distinguished medium-temperature component of magnetization (O = 53,4 °S, A = 5,9 °E) corresponds to the direction of the Permian poles TCMP for the Baltic area that indicates magnetization reversal of rocks. High temperature (characteristic) component of magnetization distinguished on lots of samples of the Konovsk suite corresponds to the Silurian fragment of TCMP for the Baltic and is determined by the presence of terrigenous hematite (ti-tanomagnetite) grains and is, according to our interpretation, the primary magnetization. Its corresponding paleomagnetic pole (O = 19,9 °S, A = 339,8 °E) is in good agreement with the Silurian fragment of TCMP. The results are in good accordance with the previous measurements for grey-colored sedimentary rocks of the Silurian from Podolia