Variability in the sources of North Gondwana Cadomian basins tracked by Nd isotopic systematics (Iberian Massif)

Fuenlabrada, José Manuel; Arenas, Ricardo; Pereira, Manuel Francisco; Rojo Pérez, Esther; Sánchez Martínez, Sonia; Díez Fernández, Rubén

doi:10.1016/j.precamres.2023.107185

Cited by 2 publications

(1 citation statement)

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“…According to [62,139], the isotopic signatures and the lower Nd model ages of the metasediments from the southern CIZ, when compared to those from the northern CIZ, support the idea of a major contribution of juvenile sources. Nevertheless, the higher juvenile contribution in southern CIZ metasediments most likely does not reflect a more mafic composition, when compared to the metapelites from the northern CIZ [62].…”

Section: Crustal Residence Timesmentioning

confidence: 90%

Zircon U–Pb Dating and Lu–Hf Isotopic Composition of Some Granite Intrusions in Northern and Central Portugal: Constraints on the Emplacement Age and Nature of the Source Rocks

Gonçalves,

Teixeira,

Sant’Ovaia

et al. 2024

Minerals

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Freixo de Numão (FNG) and Capinha (CG) granites are prominent intrusions in the Douro Group (northern Central Iberian Zone, CIZ) and Beiras Supergroup (southern CIZ) metasediments, respectively. U-Pb dating revealed crystallization ages of 306 ± 2 Ma for FNG and 301 ± 3 Ma for CG, whereas Lu–Hf systematics has shown ɛHft values ranging from −4.5 to +0.6 and from −5.5 to +0.3 in FNG and CG autocrysts, respectively, suggesting that they originate from heterogeneous crustal anatectic melts, but a direct mantle-derived material contribution can also be considered. The isotopic data of inherited zircon cores of both granites, with ɛHft values ranging from −16.8 to +8.4 in FNG, and from −19.4 to +10.1 in CG, are compatible with a derivation from heterogeneous Neoproterozoic metasedimentary sources, consisting of juvenile and recycled crustal materials, comparable to those of the wall rocks. However, the less evolved initial 176Hf/177Hf signature of magmatic zircons of both granites requires more immature metasediments/juvenile materials as main sources for the parental magmas. In fact, for FNG, the high Sr and Ba whole-rock content, and the upper Cambrian inheritance highlight the involvement of a metaigneous protolith in its genesis.

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Section: Crustal Residence Timesmentioning

confidence: 90%