Open AccessA history of Proterozoic terranes in southern South America: From Rodinia to Gondwana
Author(s) -
César Casquet,
Carlos W. Rapela,
R. J. Pankhurst,
Edgardo G. Baldo,
Carmen Galindo,
C. Mark Fanning,
Juán A. Dahlquist,
J. Saavedra
Publication year - 2011
Publication title -
geoscience frontiers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.842
H-Index - 57
eISSN - 2588-9192
pISSN - 1674-9871
DOI - 10.1016/j.gsf.2011.11.004
Subject(s) - supercontinent , rodinia , gondwana , geology , craton , proterozoic , paleontology , terrane , basement , laurentia , precambrian , paleozoic , tectonics , geography , archaeology
The role played by Paleoproterozoic cratons in southern South America from the Mesoproterozoic\udto the Early Cambrian is reconsidered here. This period involved protracted continental amalgamation\udthat led to formation of the supercontinent Rodinia, followed by Neoproterozoic continental\udbreak-up, with the consequent opening of Clymene and Iapetus oceans, and finally continental\udre-assembly as Gondwana through complex oblique collisions in the Late Neoproterozoic to Early\udCambrian. The evidence for this is based mainly on a combination of precise U-Pb SHRMP dating\udand radiogenic isotope data for igneous and metamorphic rocks from a large area extending from the\udRio de la Plata craton in the east to the Argentine Precordillera in the west and as far north as Arequipa\udin Peru. Our interpretation of the paleogeographical and geodynamic evolution invokes a hypothetical\udPaleoproterozoic block (MARA) embracing basement ultimately older than 1.7 Ga in the Western Sierra
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