Nena (supercontinent)

Nena, an acronym for Northern Europe–North America, was the Early Proterozoic amalgamation of Baltica and Laurentia into a single "cratonic landmass", a name first proposed in 1990.^[1] Since then several similar Proterozoic supercontinents have been proposed, including Nuna and Arctica, that include other Archaean cratons, such as Siberia and East Antarctica.^[2]

In the original concept Nena formed c. 1,900 million years ago in the Penokean, Makkovikan, Ketilidian, and Svecofennian orogenies.^[3] However, because Nena excludes several known Archaean cratons, including those in India and Australia, it is strictly speaking not a supercontinent. Nena, or Nuna, can, nevertheless be thought of as the core of Columbia, another supercontinent concept with several proposed configurations.^[2]

Nena as a continent has been associated with the Sudbury Basin Impact.

References

Notes

^ Gower, Ryan & Rivers 1990, Introduction, p. 2
^ ^a ^b Meert 2012, pp. 990–991; Figg. 5-6, pp. 990–991
^ Gower, Ryan & Rivers 1990, Abstract

Sources

Gower, C. F.; Ryan, A. B.; Rivers, T. (1990). "Mid-Proterozoic Laurentia–Baltica: an overview of its geological evolution and a summary of the contributions made by this volume". In Gower, C. F.; Rivers, T.; Ryan, B. (eds.). Mid-Proterozoic Laurentia-Baltica (PDF). St. John's Newfoundland: Geological Association of Canada. pp. 1–20. Retrieved 1 April 2018. {{cite book}}: Invalid |ref=harv (help)
Meert, J. G. (2012). "What's in a name? The Columbia (Paleopangaea/Nuna) supercontinent" (PDF). Gondwana Research. 21 (4): 987–993. doi:10.1016/j.gr.2011.12.002. Retrieved 1 April 2018. {{cite journal}}: Invalid |ref=harv (help)

External links

Referred to as Nuna

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[1] Gower, Ryan & Rivers 1990, Introduction, p. 2

[Meert-p990-2] Meert 2012, pp. 990–991; Figg. 5-6, pp. 990–991

[3] Gower, Ryan & Rivers 1990, Abstract

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