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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/32076

Title: A revised Ordovician age for the Sisargas orthogneiss, Galicia (Spain). Zircon U-Pb ion-microprobe and LA-ICPMS dating
Authors: Talavera Rodríguez, Cristina
Bea Barredo, Fernando
González Montero, Pilar
Whitehouse, Martin
Issue Date: 2008
Abstract: The Sisargas orthogneiss is located in the Schistose Domain of the Galicia Trás-Os-Montes Zone. It has previously been dated by Allegret and Iglesias (1987) who reported an U-Pb upper intercept at 570 ± 14 Ma, considered to be the crystallization age. For this reason, the Sisargas orthogneiss has traditionally been considered one of the oldest magmatic rocks of the Central Iberian Zone. However, new SIMS and LA-ICPMS data reveal that it crystallized at 479 ± 7 Ma and contains zircons with abundant pre-magmatic cores with ages clustering at 585 ± 15 Ma. This suggests that the Sisargas orthogneiss derives from the melting of a Pan-African protolith.
Sponsorship: This work was financially supported by the Spanish grant CLG2005-05863/BTE and the Andalucian grant RNM1595. This is the Nordsim publication nº 209. The Nordsim facility is operated and financed under a contract between the research funding agencies of Denmark, Norway and Sweden, the Swedish Museum of Natural History and the Geological Survey of Finland.
Publisher: Universidad de Barcelona; Instituto de Ciencias de la Tierra Jaume Almera
Keywords: U-Pb dating
Zircon
Sisargas orthogneiss
Iberian Massif
URI: http://hdl.handle.net/10481/32076
ISSN: 1695-6133
1696-5728
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Talavera, C.; et al. A revised Ordovician age for the Sisargas orthogneiss, Galicia (Spain). Zircon U-Pb ion-microprobe and LA-ICPMS dating. Geologica Acta, 6(4): 313-317 (2008). [http://hdl.handle.net/10481/32076]
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