[Article] Zircon petrochronology reveals the moderately juvenile signature of a diatexite from the boundary zone between the Brasília and Ribeira orogens (SE Brazil): Relict of a Tonian arc?

EN | How fun is to find an exception to the rule?In our contribution we report a biotite-bearing granitic leucosome from Socorro-Guaxupé nappe of the Southern Brasília orogen with an anomalous juvenile-like signature.The zircon extracted from this rock yield a protracted spread of U–Pb ages from ca. 890 Ma to ca. 540 Ma and theContinue reading “[Article] Zircon petrochronology reveals the moderately juvenile signature of a diatexite from the boundary zone between the Brasília and Ribeira orogens (SE Brazil): Relict of a Tonian arc?”

[Article] Multiple P–T–d–t paths reveal the evolution of the final assembly of the supercontinent Nuna (1.6–1.5 Ga) in NE Australia

EN | The integration of petrochronology with metamorphic petrology and petrostructural analysis allowed to identify two discrete metamorphic and deformation stages in the Proterozoic Georgetown Inlier (NE Australia). Robust and precise Lu–Hf geochronology determined garnet growth at 1.6 Ga (M1/D1), which was supported by a similar age from in–situ monazite geochronology. Medium-P/T metamorphism (M1) duringContinue reading “[Article] Multiple P–T–d–t paths reveal the evolution of the final assembly of the supercontinent Nuna (1.6–1.5 Ga) in NE Australia”

[Tips] Zircon role in Petrochronology

EN | Zircon is a petrochronology superstar and here is why: besides being a very robust chronometer, it can record different geological conditions during the formation of a rock. For example, are you aware that zircon morphology may constrain the temperature in which it was crystallized? Within this context, Araujo et al. (2020) explored zirconContinue reading “[Tips] Zircon role in Petrochronology”

[Article] The missing piece of the Paranapanema block in the Guaxupé nappe (Southernmost Brasília orogen)

EN | The Paranapanema block constitutes an important piece in paleogeographical reconstructions. However, few direct information about it in the Southernmost Brasília orogen is available as the block has been covered since the Cretaceous by the Parana basin. Surprisingly, two very similar samples of Opx-Cpx-Hbl banded granulites separated by 5km have shown strongly different U-PbContinue reading “[Article] The missing piece of the Paranapanema block in the Guaxupé nappe (Southernmost Brasília orogen)”