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Abstract <p>The coincidence of key poles, paleomagnetic poles recalculated from secondary magnetization components of various ages, and the reference Phanerozoic poles of the East European and Laurentia cratons is tested. The main periods of such coincidences are distinguished. Remagnetization at 1.59–1.45 Ga, 580–550 Ma, and 250–200 Ma during the breakup of the Pangaea supercontinent is established from the correlation of angular distances between pairs of coeval poles of the East European and Superior cratons. It is shown that the coincidence of the Precambrian pole with a Phanerozoic part of the apparent pole wandering path is not always a result of remagnetization but can be related to the repeated position of the same craton in the same area of the Earth as part of different Precambrian supercontinents. The assessment of such “repeatability” showed that the same tectonic block over a period of 2.5 Ga can occur in the same area of the Earth more than two times, which can explain the coincidence of poles of different ages. The differences in periods of the occurrence of the NENA megacontinent and Precambrian Rodinia, Nuna/Columbia and Kenorland supercontinents is probably related to their introversal and extroversal formation mechanisms, respectively.</p>

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The Precambrian NENA Megacontinent: Stable Configuration or Phanerozoic Remagnetization?

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • N. V. Lubnina,
  • V. S. Zakharov

摘要

Abstract

The coincidence of key poles, paleomagnetic poles recalculated from secondary magnetization components of various ages, and the reference Phanerozoic poles of the East European and Laurentia cratons is tested. The main periods of such coincidences are distinguished. Remagnetization at 1.59–1.45 Ga, 580–550 Ma, and 250–200 Ma during the breakup of the Pangaea supercontinent is established from the correlation of angular distances between pairs of coeval poles of the East European and Superior cratons. It is shown that the coincidence of the Precambrian pole with a Phanerozoic part of the apparent pole wandering path is not always a result of remagnetization but can be related to the repeated position of the same craton in the same area of the Earth as part of different Precambrian supercontinents. The assessment of such “repeatability” showed that the same tectonic block over a period of 2.5 Ga can occur in the same area of the Earth more than two times, which can explain the coincidence of poles of different ages. The differences in periods of the occurrence of the NENA megacontinent and Precambrian Rodinia, Nuna/Columbia and Kenorland supercontinents is probably related to their introversal and extroversal formation mechanisms, respectively.