A revised Ordovician age for the Sisargas orthogneiss, Galicia (Spain). Zircon U-Pb ion-microprobe and LA-ICPMS dating

Geologica Acta

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Title A revised Ordovician age for the Sisargas orthogneiss, Galicia (Spain). Zircon U-Pb ion-microprobe and LA-ICPMS dating
 
Creator TALAVERA, C.
BEA, F.
GONZÁLEZ MONTERO, P.
WHITEHOUSE, M.J.
 
Subject U-Pb dating; Zircon; Sisargas orthogneiss; Iberian Massif
 
Description 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.
 
Publisher Geologica Acta
Geologica Acta
Geologica Acta
 
Contributor
 
Date 2009-04-28
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion

 
Format application/pdf
 
Identifier https://revistes.ub.edu/index.php/GEOACTA/article/view/105.000000259
10.1344/105.000000259
 
Source Geologica Acta; Vol 6, No 4; 313-317
Geologica Acta; Vol 6, No 4; 313-317
Geologica Acta; Vol 6, No 4; 313-317
1696-5728
1695-6133
 
Language eng
 
Relation https://revistes.ub.edu/index.php/GEOACTA/article/view/105.000000259/4267
 
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