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- W1544185831 abstract "SHRIMP U–Pb zircon analyses have shown the complexity of dating volcanic rocks due to the presence of inner cores within zircon crystals. Using the cathodoluminescence studies assisting ion microprobe analyses allow as to conclude that: the two low-grade metavolcanic samples from the Schistose Domain of the Galicia-Tras-os-Montes Zone in the northeast limb of the Verin-Braganca synform (NW Spain and NE Portugal) yield ages of 488.7 ± 3.7Ma and 499.8 ± 3.7Ma (lowermost Ordovician-Upper Cambrian). The Schistose Domain had been traditionally considered as a parautochthonous tectonic unit, i.e. as the stratigraphic continuation of the autochthonous underlying rocks, only locally or moderately detached from them as a result of strong dragging forces from large allochthonous units above it. Current interpretation of the Schistose Domain suggests that this domain formed the outboard edge of the terrane. Important Arenig, felsic magmatism with similar geochemical signature to the volcanic bodies in the Schistose Domain of the Galicia-Tras-os-Montes Zone (GTMSD) series is present also in the adjacent Ollo de Sapo Domain of the Central Zone. This contemporary nature of magmatic events provides an additional argument to support the Iberian affinity of the Schistose Domain of the Galicia-Tras-os-Montes Zone. However, the Cambro–Ordovician facies are very different in the Schistose Domain with respect to the autochthonous unit, the Central–Iberian Zone, suggesting that the Schistose Domain must be considered as a major allochthonous unit with a displacement of over several tens of kilometers." @default.
- W1544185831 created "2016-06-24" @default.
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- W1544185831 date "2014-01-01" @default.
- W1544185831 modified "2023-09-25" @default.
- W1544185831 title "U�Pb zircon SHRIMP evidence for Cambrian volcanism in the Schistose Domain within the Galicia-Tr�s-" @default.
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- W1544185831 doi "https://doi.org/10.1344/geologicaacta2014.12.3.3" @default.
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