Geologicheskii Vestnik

We present the results of the detailed paleomagnetic and rock-magnetic investigation of the Riphean intrusions from the Bashkirian meganticlinorium (Southern Urals). The new paleomagnetic pole for the boundary of the Lower and Middle Riphean of the East European Craton (1349±11 Ma) is calculated from 8 thin sheet intrusions. Plat=8.4°; Plong=162.4°; A95=4.1°. Arguments in favor of the primary origin of the remanence and the absence of significant tectonic dislocations near the sampled intrusions are discussed. Besides, from 11 intrusive bodies we obtained the pole of Late Paleozoic syn-collisional remagnetization. The comparison of mean paleomagnetic directions for the different studied regions demonstrates the absence of any traces of essential rotation of blocks within the Bashkirian megazone in the Later Paleozoic. Analysis of the anisotropy of magnetic susceptibility revealed the significant role of the shear zones during the emplacement of intrusions. It was shown that the regional Bakal-Satka shear acted as the long-lived magma feeder zone and controlled the emplacement of the Berdyaush rapakivi pluton and dikes in the Lower–Middle Riphean.

Paleomagnetism, Bashkirian meganticlinorium, Southern Urals, Riphean, dike swarms, anisotropy of magnetic susceptibility, apparent polar wander path, paleotectonic reconstructions

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