INVESTIGADORES
DAHLQUIST Juan Andres
artículos
Título:
NEOPROTEROZOIC A-TYPE GRANITIC MAGMATISM IN THE WESTERN SIERRAS PAMPEANAS (ARGENTINA): EVIDENCE FOR RODINIA BREAK-UP ALONG A PROTO-IAPETUS RIFT?
Autor/es:
BALDO, E.G.; CASQUET , C.; PANKHURST, R.J.; GALINDO, C.; RAPELA, C.W.; FANNING, C.M.; DAHLQUIST, J.A.; MURRA, J.
Revista:
TERRA NOVA (PRINT)
Editorial:
Blackwell Publishing Ltd.
Referencias:
Lugar: Oxford. UK.; Año: 2006 vol. 18 p. 388 - 396
ISSN:
0954-4879
Resumen:
A-type granitic orthogneisses of 774 ± 6 Ma (U-Pb SHRIMP zircon age), i.e., mid Neoproterozoic, are reported for the first time from the Grenvillian basement of Western Sierras Pampeanas in Argentina. These anorogenic granitoids 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 along the Appalachian margin of Laurentia (Blue Ridge), thus adding to former evidence that the Western Sierras Pampeanas Grenvillian basement probably comprised the conjugate rifted margin of eastern Laurentia during Rodinia break-up and the final opening of the Iapetus ocean.
