Neoproterozoic A-type magmatism in the Western Sierras
Pampeanas (Argentina): evidence for Rodinia break-up along
a proto-Iapetus rift?
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Publication date
2006
Authors
Baldo, Edgardo G.
Pankhurst, R.J.
Rapela, Carlos W.
Fanning, C.M.
Dahlquist, Juan A.
Murra, Juan Alberto
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Blackwell Publishing Ltd
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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.
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