ИСТИНА

Antarctica, 99% covered by ice, is the least explored continent. The almost complete absence of reliable paleomagnetic poles for the Precambrian of the Antarctic craton determines the relevance of our research. We present the results of a paleomagnetic analysis of 335 samples from 26 dikes (32 sites in total) of Mesoproterozoic gabbro-dolerite dikes collected in the Bunger Hills in western Wilkes Land. The dykes are postkinematic and weakly metamorphosed. There are a large number of bodies, reliable isotopic dates by zircon and baddeleyite – 1134+/-9 and 1131+/-16 Ma (Stark et al., 2018) and preliminary paleomagnetic results (Liu et al., 2018). In the paleomagnetic record of gabbro-dolerites, high-temperature components of NRM and remagnetization circles are distinguished. The mean directions of the high-temperature components of the sites are grouped on the stereogram into two almost antipodal clusters. The reversal test is negative, which, we believe, is due to the presence of non-averaged data in the distribution. The primary nature of the components is confirmed by a positive contact test. The paleomagnetic pole calculated from 32 sites (Plat=-22.1° Plong=266.3° A95=5.5°) differs sharply from the results (Liu et al., 2018). Our pole coincides with one of two reliable paleomagnetic poles from the Precambrian of East Antarctica, from the similar age intrusions of the Coats Land block (Gose et al., 1997). It also slightly differs from the second reliable pole of Antarctica, based on the Mesoproterozoic rocks of the Grunehogna (Jones et al., 2003). We can assume a rigid connection between Mawson and the Coats Land starting from about 1110 Ma, as well as minor rotations between agglomerate of the Mawson and the Coats Land and Grunehogna. Our data make the paleotectonic reconstructions of Rodinia with the participation of East Antarctica for the boundary of 1100 Ma more reasonable and at the same time indicate the need to correct the existing models of the collapse of Rodinia and the amalgamation of Gondwana in the Neoproterozoic and Early Paleozoic.