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Proto-Avalonia: A 1.2–1.0 Ga tectonothermal event and constraints for the evolution of Rodinia

2000; Geological Society of America; Volume: 28; Issue: 12 Linguagem: Inglês

10.1130/0091-7613(2000)28 2.0.co;2

1943-2682

J. Brendan Murphy, Rob Strachan, R. Damian Nance, K.D. Parker, M.B. Fowler,

Geochemistry and Elemental Analysis

Research Article| December 01, 2000 Proto-Avalonia: A 1.2–1.0 Ga tectonothermal event and constraints for the evolution of Rodinia J.B. Murphy; J.B. Murphy 1Department of Geology, St. Francis Xavier University, Antigonish, Nova Scotia B2G 2W5, Canada Search for other works by this author on: GSW Google Scholar R.A. Strachan; R.A. Strachan 2Geology, Oxford Brookes University, Oxford OX3 OBP, UK Search for other works by this author on: GSW Google Scholar R.D. Nance; R.D. Nance 3Department of Geological Sciences, Ohio University, Athens, Ohio 45701, USA Search for other works by this author on: GSW Google Scholar K.D. Parker; K.D. Parker 2Geology, Oxford Brookes University, Oxford OX3 OBP, UK Search for other works by this author on: GSW Google Scholar M.B. Fowler M.B. Fowler 2Geology, Oxford Brookes University, Oxford OX3 OBP, UK Search for other works by this author on: GSW Google Scholar Geology (2000) 28 (12): 1071–1074. https://doi.org/10.1130/0091-7613(2000)28 2.0.CO;2 Article history received: 09 May 2000 rev-recd: 25 Aug 2000 accepted: 06 Sep 2000 first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation J.B. Murphy, R.A. Strachan, R.D. Nance, K.D. Parker, M.B. Fowler; Proto-Avalonia: A 1.2–1.0 Ga tectonothermal event and constraints for the evolution of Rodinia. Geology 2000;; 28 (12): 1071–1074. doi: https://doi.org/10.1130/0091-7613(2000)28 2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The Neoproterozoic evolution of Avalonia is thought to have been geodynamically linked to the amalgamation and dispersal of Rodinia. Similar Sm-Nd isotopic signatures for different periods of arc activity suggest that Avalonian basement, or proto-Avalonia, was generated in a series of primitive oceanic island arcs between 1.2 and 1.0 Ga. Because this interval coincides with the amalgamation of Rodinia, proto-Avalonia is inferred to have been located in a Panthalassa-like peri-Rodinian ocean. An early (760–660 Ma) phase of Avalonian arc activity is attributed to renewed subduction in the peri-Rodinian ocean following the breakup of Rodinia, which caused the accretion of Avalonian terranes to the Gondwanan margin by ca. 650 Ma. Further subduction along the margin occurred outboard of these terranes and resulted in the onset of main-phase Avalonian volcanism at 630 Ma. The diachronous cessation of arc magmatism is attributed to ridge-trench collision and the generation of a continental transform. The geodynamic link between Avalonia and Rodinia is analogous to that between the Mesozoic dispersal of Pangea and the tectonothermal evolution of western North America. This event also resulted in the accretion of outboard terranes and in arc-related magmatism that is currently being terminated in a diachronous manner by ridge collision and the generation of the San Andreas transform. The model implies that the Neoproterozoic evolution of Avalonia and other peri-Gondwanan terranes provide important constraints on the tectonic history of a large portion of the Rodinian continental margin. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.