Neoproterozoic evolution of Rodinia: constraints from new paleomagneticdata on the western margin of the Siberian cratonстатья
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Дата последнего поиска статьи во внешних источниках: 12 декабря 2016 г.
Аннотация:The paper summarizes paleomagnetic results obtained from the Neoproterozoic rocks of the western margin of the Siberian craton. On the
basis of the obtained paleomagnetic poles and available paleomagnetic data for the Precambrian of Siberia, a new version of the Neoproterozoic
segment of the apparent polar wandering path (APWP) is proposed for the craton and is compared with the Laurentian APWP. The superposition
of these paths suggests that in the Neoproterozoic the southern margin of the Siberian craton (in modern coordinates) faced the Canadian
margin of Laurentia. Most likely, in the end of the Mesoproterozoic and during the Neoproterozoic the Siberian craton and Laurentia were
connected to form the supercontinent Rodinia. At 1 Ga the western margin of the Siberian craton was a northern (in modern coordinates)
continuation of the western margin of Laurentia. The available paleomagnetic data on Laurentia and continental blocks of Eastern Gondwana
(Australia, Antarctica, India, South China) and the proposed APWP trend allowed a new model for the breakup of this segment of Rodinia.
Analysis of a total of the data available suggests that strike-slip movements on the background of the progressive opening of the oceanic
basin between Siberia and Laurentia were predominant in the south of the Siberian craton during the Neoproterozoic. Similar kinematics is
typical of the western margin of Laurentia, where strike-slip motions are probably associated with the progressive opening of the ocean basin
between Laurentia and eastern Gondwana.