Baldo, Edgardo G. and Casquet, César and Pankhurst, R.J. and Galindo Francisco, Mª del Carmen and Rapela, Carlos W. and Fanning, C.M. and Dahlquist, Juan A. and Murra, Juan Alberto (2006) Neoproterozoic A-type magmatism in the Western Sierras Pampeanas (Argentina): evidence for Rodinia break-up along a proto-Iapetus rift? Terra nova, 18 (6). pp. 388-394. ISSN 0954-4879
A-type orthogneisses of mid Neoproterozoic age (774 ± 6 Ma, U-Pb SHRIMP zircon age), are reported for the first time from the Grenvillian basement of the Western Sierras Pampeanas in Argentina. These anorogenic meta-igneous rocks represent the latest event of Rodinia break-up so far recognized in Grenvillian basement exposures across Andean South America. Moreover, they compare well with A-type granitoids and volcanic rocks along the Appalachian margin of Laurentia (Blue Ridge), thus adding to former evidence that the Western Sierras Pampeanas Grenvillian basement was left on the conjugate rifted margin of eastern Laurentia during Rodinia break-up and the consequent opening of the Iapetus ocean.
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|Uncontrolled Keywords:||Neoproterozoic; Magmatism; Sierras Pampeanas (Argentina); Rodinia|
|Subjects:||Sciences > Geology > Petrology|
|Deposited On:||17 Jan 2011 12:32|
|Last Modified:||01 Sep 2011 12:01|
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