Mineralizations of the Lavalleja Group (Uruguay), a Probable Neoproterozoic Volcano-sedimentary Sequence

Sánchez-Bettucci, Leda; Oyhantçabal, Pedro; Loureiro, Judith; Ramos, Víctor A.; Preciozzi, Fernando; Basei, Miguel Ângelo Stipp

doi:10.1016/s1342-937x(05)71060-1

Cited by 26 publications

(11 citation statements)

References 5 publications

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“…The Pavas Block comprises Archean orthogneisses and metasediments [ Preciozzi et al ., ; Hartmann et al ., ], whereas the Valentines‐Rivera Granulitic Complex is constituted by 2.2–2.1 Ga granulitic orthogneisses [ Oyhantçabal et al ., , ], which are intruded in the west by the 1.7 Ga Illescas rapakivi granite [ Campal and Schipilov , ]. The Campanero Unit comprises migmatites, amphibolites, banded iron formations, micaschists, and gneisses with zircon ages of 1.7 Ga (Figure ) [ Sánchez Bettucci et al ., , ; Oyhantçabal , ; Mallmann et al ., ]. Likewise, the Nico Pérez Terrane shows a significant Neoproterozoic reworking that is related to the evolution of the Dom Feliciano Belt.…”

Section: Geological Settingmentioning

confidence: 99%

Timing of deformation in the Sarandí del Yí Shear Zone, Uruguay: Implications for the amalgamation of western Gondwana during the Neoproterozoic Brasiliano‐Pan‐African Orogeny

et al. 2016

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U‐Pb and Hf zircon (sensitive high‐resolution ion microprobe ‐SHRIMP‐ and laser ablation‐inductively coupled plasma‐mass spectrometry ‐LA‐ICP‐MS‐), Ar/Ar hornblende and muscovite, and Rb‐Sr whole rock‐muscovite isochron data from the mylonites of the Sarandí del Yí Shear Zone, Uruguay, were obtained in order to assess the tectonothermal evolution of this crustal‐scale structure. Integration of these results with available kinematic, structural, and microstructural data of the shear zone as well as with geochronological data from the adjacent blocks allowed to constrain the onset of deformation along the shear zone at 630–625 Ma during the collision of the Nico Pérez Terrane and the Río de la Plata Craton. The shear zone underwent dextral shearing up to 596 Ma under upper to middle amphibolite facies conditions, which was succeeded by sinistral shearing under lower amphibolite to upper greenschist facies conditions until at least 584 Ma. After emplacement of the Cerro Caperuza granite at 570 Ma, the shear zone underwent only cataclastic deformation between the late Ediacaran and the Cambrian. The Sarandí del Yí Shear Zone is thus related to the syncollisional to postcollisional evolution of the amalgamation of the Río de la Plata Craton and the Nico Pérez Terrane. Furthermore, the obtained data reveal that strain partitioning and localization with time, magmatism emplacement, and fluid circulation are key processes affecting the isotopic systems in mylonitic belts, revealing the complexity in assessing the age of deformation of long‐lived shear zones.

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Section: Geological Settingmentioning

confidence: 99%

Timing of deformation in the Sarandí del Yí Shear Zone, Uruguay: Implications for the amalgamation of western Gondwana during the Neoproterozoic Brasiliano‐Pan‐African Orogeny

et al. 2016

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“…This belt, similar to that proposed by Porada (1979), was generated from the NW subduction of an oceanic crust, the Brusque Group having evolved in a back-arc setting. This model, has been modified as a consequence of studies taken place in different DFB segments, such as: da Silva et al (1980), Basei et al (2000Basei et al ( , 2005Basei et al ( and 2008a, Passarelli et al (1993), Mantovani et al (1989), Phillip et al (2004Fernandes et al (1995, in Rio Grande do Sul, and Bossi and Gaucher (2004), Sanchez-Bettucci et al (2004, Oyhantçabal et al (2009) and Gaucher et al (2009) in Uruguay.…”

Section: Geological Settingmentioning

confidence: 99%

Tectonic evolution of the Brusque Group, Dom Feliciano belt, Santa Catarina, Southern Brazil

Basei

Neto

Castro

et al. 2011

Journal of South American Earth Sciences

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“…Namibia900–8003 66 rift-related volcanicsSao FranciscoMara Rosa Arc900–8000.43 67,68 volcanic arc Cu-AuRio de la PlataUruguay~715? 69 volcanic massive sulphideAustraliaSouth Australia~800~3 70 syn-sedimentary magmatism…”

Section: Introductionmentioning

confidence: 99%

Neoproterozoic copper cycling, and the rise of metazoans

Parnell

Boyce

2019

Sci Rep

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The rise of animal life is temporally related to the increased availability of oxygen in the hydrosphere and atmosphere during the Neoproterozoic. However, the earliest metazoans probably needed relatively low oxygen concentrations, suggesting additional environmental and/or biochemical developments were involved. Copper was required in the exploitation of oxygen by the evolving animals, through the development of respiratory proteins and the extracellular matrix required for structural support. We synthesize global data demonstrating a marked enrichment of copper in the Earth’s crust that coincided with the biological use of oxygen, and this new biological use of copper. The copper enrichment was likely recycled into the surface environment by weathering of basalt and other magmatic rocks, at copper liberation rates up to 300 times that of typical granitic terrain. The weathering of basalts also triggered the Sturtian glaciation, which accelerated erosion. We postulate that the coincidence of a high availability of copper, along with increased oxygen levels, for the first time during the Neoproterozoic supported the critical advances of respiration and structural support in evolving animals.

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Mineralizations of the Lavalleja Group (Uruguay), a Probable Neoproterozoic Volcano-sedimentary Sequence

Cited by 26 publications

References 5 publications

Timing of deformation in the Sarandí del Yí Shear Zone, Uruguay: Implications for the amalgamation of western Gondwana during the Neoproterozoic Brasiliano‐Pan‐African Orogeny

Timing of deformation in the Sarandí del Yí Shear Zone, Uruguay: Implications for the amalgamation of western Gondwana during the Neoproterozoic Brasiliano‐Pan‐African Orogeny

Tectonic evolution of the Brusque Group, Dom Feliciano belt, Santa Catarina, Southern Brazil

Neoproterozoic copper cycling, and the rise of metazoans

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