World Library  
Flag as Inappropriate
Email this Article

Atlantica

Article Id: WHEBN0000855930
Reproduction Date:

Title: Atlantica  
Author: World Heritage Encyclopedia
Language: English
Subject: Pannotia, Earth sciences/Archives, Atlantica (disambiguation), Proterozoic, Historical continents
Collection: Historical Continents, History of the Atlantic Ocean, Proterozoic
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Atlantica

Atlantica at about 2 Ga. Archean cratons in grey.

Atlantica (Greek: Ατλαντικα; Atlantika) is an ancient continent that formed during the Proterozoic about (two billion years ago, Ga) from various 2 Ga cratons located in what is now West Africa and eastern South America. [1] The name, introduced by Rogers 1996, was chosen because the continent opened up to form the South Atlantic Ocean. [2]

Contents

  • Formation 1
  • Breakup 2
  • See also 3
  • Notes 4
  • References 5

Formation

Atlantica formed simultaneously with Nena at about 1.9 Ga from Archaean cratons, including Amazonia in present-day South America, and the Congo, West Africa and North Africa Cratons in Africa.[3]

Breakup

Reconstruction of Earth 550 Ma ago showing the cratons of Atlantica forming West Gondwana

Atlantica separated from Nena between 1.6–1.4 Ga when Columbia — a supercontinent composed of Ur, Nena, and Atlantica — fragmented. [2] Together with continents Nena and Ur and some minor plates, Atlantica formed the supercontinent Rodinia about 1 Ga ago. The rifting of Rodinia between 1–0.5 Ga resulted in the formation of three new continents: Laurasia and East and West Gondwana, of which Atlantica became the nucleus of the latter. [1] During this later stage, the Neoproterozoic era, a Brasiliano-Pan African orogenic system developed. The central part of this system, the Araçuaí-West Congo orogen, has left a distinct pattern of deformations, still present on both sides of the Atlantic. [4][5]

See also

Notes

  1. ^ a b Rogers 1996
  2. ^ a b Sankaran 2003, p. 1122
  3. ^ Yoshida, Windley & Dasgupta 2003, p. 16
  4. ^ Alkmim et al. 2006, Abstract
  5. ^ Noce et al. 2007, p. 60

References

  • Alkmim, Fernando F.; Marshak, Stephen; Pedrosa-Soares, Antônio Carlos; Peres, Guilherme Gravina; Cruz, Simone Cerqueira Pereira; Whittington, Alan (September 1, 2006). "Kinematic evolution of the Araçuaí-West Congo orogen in Brazil and Africa: Nutcracker tectonics during the Neoproterozoic assembly of Gondwana". Precambrian Research 149 (1-2): 43–64.  
  • Noce, Carlos M.; Pedrosa-Soares, Antônio Carlos; da Silva, Luiz Carlos; Armstrong, Richard; Piuzana, Danielle (2007). "Evolution of polycyclic basement complexes in the Aracuaí Orogen, based on U–Pb SHRIMP data: Implications for Brazil–Africa links in Paleoproterozoic time" (PDF). Precambrian Research (159): 60–78.  
  • Rogers, John J. W. (January 1996). "A History of Continents in the Past Three Billion Years". The Journal of Geology 104 (1): 91–107.  
  • Sankaran, A. V. (2003). "The supercontinent medley: Recent views" (PDF). Current Science 85 (8): 1121–1123. 
  • Yoshida, Masaru; Windley, Brian F.; Dasgupta, Somnath, eds. (2003). Proterozoic East Gondwana: supercontinent assembly and breakup 206. Geological Society of London.  
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.