Evidence of the Pampean cycle in the basament of the north-western sector of Sierra de San Luis

A preliminary zircon U-Pb age is presented for a feldspar-biotite gneiss from the Nogoli Metamorphic Complex, Sierra de San Luis, at San Francisco del Monte de Oro. The data show a cristallization age of 554 ± 4,8 Ma, which represents one of the first evidences of the Pampean Cycle in this geologica...

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Bibliographic Details
Language:unknown
Published: 2003
Subjects:
Pampean cycle
San Luis Range
Sierras Pampeanas
U-Pb ages
Zircons
crystallization
gneiss
metamorphic facies
Proterozoic
uranium-lead dating
zircon
Argentina
San Luis
Sierra de San Luis
South America
Western Hemisphere
World
South Atlantic Ocean
Online Access:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v58_n4_p541_Vujovich
https://hdl.handle.net/20.500.12110/paper_00044822_v58_n4_p541_Vujovich
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Summary:A preliminary zircon U-Pb age is presented for a feldspar-biotite gneiss from the Nogoli Metamorphic Complex, Sierra de San Luis, at San Francisco del Monte de Oro. The data show a cristallization age of 554 ± 4,8 Ma, which represents one of the first evidences of the Pampean Cycle in this geological setting. An episodic lead loss for Cretaceous times (112 ± 23 Ma) is postulated, based on the lower intercept of the discordia line. This age could be associated with anomalous thermal gradients due the extensional and rifting processes which affected Gondwana during the opening of the South Atlantic Ocean. © 2003 Asociacón Geológica Argentina.

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