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Evidencias del ciclo Pampeano en el basamento del sector noroccidental de la sierra de San Luis
| Content Provider | Semantic Scholar |
|---|---|
| Author | Vujovich, Graciela Irene Ostera, Héctor A. |
| Copyright Year | 2003 |
| Abstract | 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 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. |
| Starting Page | 541 |
| Ending Page | 548 |
| Page Count | 8 |
| File Format | PDF HTM / HTML |
| Volume Number | 58 |
| Alternate Webpage(s) | http://www.scielo.org.ar/pdf/raga/v58n4/v58n4a06.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
