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Neoproterozoic A-type magmatism in the Western Sierras Pampeanas (Argentina): evidence for Rodinia break-up along a proto-Iapetus rift?

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

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Official URL: http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-3121

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Abstract

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.


Item Type:Article
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Uncontrolled Keywords:Neoproterozoic; Magmatism; Sierras Pampeanas (Argentina); Rodinia
Subjects:Sciences > Geology > Petrology
ID Code:12026
Deposited On:17 Jan 2011 12:32
Last Modified:01 Sep 2011 12:01

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