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?”
Category Archives: Artigos
[Article] Implications of the dominant LP–HT deformation in the Guanhães Block for the Araçuaí West-Congo Orogen evolution
EN | For far too long has the Guanhães Block been viewed as an empty square in the evolutionary models of the Araçuaí-West-Congo Orogen. A new publication in Gondwana Research uses petrochronological strategies with dating of multiple mineral phases, traditional thermobarometry and phase-diagram modeling to understand the conditions in which the main pervasive foliation wasContinue reading “[Article] Implications of the dominant LP–HT deformation in the Guanhães Block for the Araçuaí West-Congo Orogen evolution”
[Article] Spatio–temporal evolution of Mesoproterozoic magmatism in NE Australia: A hybrid tectonic model for final Nuna assembly
EN | Fun, Fun, Fun!! Do you like puzzles and untangling conundrums? Then, check out our proposed tectonic model to explain the tectonic regimes operating back in the Proterozoic (c. 2.0 Ga to 1.4 Ga), when the oldest supercontinent known today, Nuna, formed.In this contribution, we combined previous structural and metamorphic studies with zircon Lu-HfContinue reading “[Article] Spatio–temporal evolution of Mesoproterozoic magmatism in NE Australia: A hybrid tectonic model for final Nuna assembly”
[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”
[Article] 4D history of the Nimbus VHMS ore deposit in the Yilgarn Craton, Western Australia
EN | The same principle applied to petrochronology can be utilized to better understand the timing and mechanisms of mineralization. Diverse isotopic constrains leads to the understanding of the 4D evolution of deposits, driving future discoveries. Different geochronometers indicate the existence of two main events that have interacted with the Nimbus deposit, Australia. If theContinue reading “[Article] 4D history of the Nimbus VHMS ore deposit in the Yilgarn Craton, Western Australia”
[Article] (U)HT rocks from Madagascar
EN | Madagascar has by spectacular (U)HT rocks. Titanite in these rocks records the waning stages of UHTM followed by pervasive hydrothermal activity associated with U–Th and phlogopite mineralization. Contribution by the researcher Robert Holder (@thats.so.meta).Read more in Holder and Hacker (2019). Fluid-driven resetting of titanite following ultrahigh-temperature metamorphism in southern Madagascar. Chemical Geology! Rochas deContinue reading “[Article] (U)HT rocks from Madagascar”
[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)”
[Article] Structural Evolution of a 1.6 Ga Orogeny Related to the Final Assembly of the Supercontinent Nuna: Coupling of Episodic and Progressive Deformation
EN | In this contribution a multiscale structural and microstructural approach is applied to unravel the tectono-metamorphic history of a Proterozoic orogenic belt in NE Australia related to the 1.6 Ga assembly of the supercontinent Nuna. Three main deformation stages and associated composite fabrics were identified in the Georgetown Inlier in NE Australia. Coupling ofContinue reading “[Article] Structural Evolution of a 1.6 Ga Orogeny Related to the Final Assembly of the Supercontinent Nuna: Coupling of Episodic and Progressive Deformation”
PETROCHRONICS 