U–Pb geochronology and geochemistry of grenville-age plutons in the Sunsas Belt - Bolivia, SW Amazonian Craton: Tectonic and magmatic implications

Nedel, Ingrid M.; Fuck, Reinhardt A.; Ruiz, Amarildo Salina; Matos, Renato Camargo; Ferreira, Alanielson

doi:10.1016/j.jsames.2020.102845

Cited by 15 publications

(4 citation statements)

References 71 publications

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“…The late Mesoproterozoic to early Neoproterozoic Grenvillian orogeny and the assembly of Rodinia: Turning point in the tectonic evolution of Laurentia 21 to eastern Laurentia, there is evidence in Amazonia for accretionary orogenesis in the ca. 1160 to 1090 Ma time period leading up to the Sunsás orogeny (Nedel et al, 2020(Nedel et al, , 2021Quadros et al, 2020). For instance, Quadros et al (2020) interpreted geologic and geochronologic data from the Nova Brasilândia belt inboard of the southwestern margin of the Amazonia craton to indicate arc magmatism and accretionary orogenesis associated with arc and terrane collisions ca.…”

Section: Paleogeographic Modelmentioning

confidence: 99%

The late Mesoproterozoic to early Neoproterozoic Grenvillian orogeny and the assembly of Rodinia: Turning point in the tectonic evolution of Laurentia

Swanson‐Hysell

Rivers

Lee

2023

Laurentia: Turning Points in the Evolution of a Continent

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The amalgamation of Laurentia’s Archean provinces ca. 1830 Ma was followed by ~700 m.y. of accretionary orogenesis along its active southeastern margin, marked by subduction of oceanic lithosphere, formation of arcs and back-arcs, and episodic accretion. This prolonged period of active-margin tectonic processes, spanning the late Paleoproterozoic and Mesoproterozoic eras, resulted in major accretionary crustal growth and was terminated by closure of the Unimos Ocean (new name). Ocean closure was associated with rapid motion of Laurentia toward the equator and resulted in continental collision that led to profound reworking of much of the accreted Proterozoic crust during the ca. 1090–980 Ma Grenvillian orogeny. The Grenvillian orogeny resulted in formation of a large, hot, long-duration orogen with a substantial orogenic plateau that underwent extensional orogenic collapse before rejuvenation and formation of the Grenville Front tectonic zone. The Grenvillian orogeny also caused the termination and inversion of the Midcontinent Rift, which, had it continued, would likely have split Laurentia into distinct continental blocks. Voluminous mafic magmatic activity in the Midcontinent Rift ca. 1108–1090 Ma was contemporaneous with magmatism in the Southwestern Laurentia large igneous province. We discuss a potential link between prolonged subduction of oceanic lithosphere beneath southeast Laurentia in the Mesoproterozoic and the initiation of this voluminous mafic magmatism. In this hypothesis, subducted water in dense, hydrous Mg-silicates transported to the bottom of the upper mantle led to hydration and increased buoyancy, resulting in upwelling, decompression melting, and intraplate magmatism. Coeval collisional orogenesis in several continents, including Amazonia and Kalahari, ties the Grenvillian orogeny to the amalgamation of multiple Proterozoic continents in the supercontinent Rodinia. These orogenic events collectively constituted a major turning point in both Laurentian and global tectonics. The ensuing paleogeographic configuration, and that which followed during Rodinia’s extended breakup, set the stage for Earth system evolution through the Neoproterozoic Era.

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Section: Paleogeographic Modelmentioning

confidence: 99%

The late Mesoproterozoic to early Neoproterozoic Grenvillian orogeny and the assembly of Rodinia: Turning point in the tectonic evolution of Laurentia

Swanson‐Hysell

Rivers

Lee

2023

Laurentia: Turning Points in the Evolution of a Continent

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“…In South America, the Rondonia-Juruena Province and its continuation underneath the Llanos Basin had a long-lived history of deformation spanning ca. 1.32 to 0.96 Ga (Tohver et al, 2006) with late magmatic activity in the Sunsás Orogen (1.17 to 1.08 Ga; Santos et al, 2008;Nedel et al, 2020;Johansson et al, 2022).…”

Section: Paleo-to Mesoproterozoic Orogensmentioning

confidence: 99%

New Maps of Global Geological Provinces and Tectonic Plates

Hasterok

Halpin

Collins

et al. 2022

Earth-Science Reviews

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“…Compositionally, they are formed by meta‐sedimentary, metavolcanic‐sedimentary, intrusive igneous and medium to low‐grade metamorphic rocks (Bettencourt et al, 2010, 2020; Geraldes et al, 2020; Gómez et al, 2019; Saes & Leite, 1993; Scandolara, 1999; Scandolara, Fuck, Dall'Agnol, et al, 2013; Scandolara, Fuck, Dantas, et al, 2013; Teixeira et al, 2010). Santos (2003) also reports basalts and granites with ages between 980 and 950 Ma, while Nedel et al (2020) classify the granites as fractionated I‐type and hybrid A‐type, dated between 1.17 and 1.08 Ga.…”

Section: Geological Backgroundmentioning

confidence: 99%

The Acre Basin basement (NW Brazil) and the transition from the intracratonic to retroarc foreland basin system

Oliveira

Vidotti

2022

Basin Research

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The understanding of the crustal transition between orogenic zones and cratonic portions in distal regions of foreland basins has received increasing attention, but the analysis is often hampered by the sedimentary cover. Despite the peculiar location of the Acre Basin, specifically between the Amazonian Craton and the sub-Andean zone, local basement studies are still scarce due to lacking seismic data and exploratory wells. Therefore, this work aims to map basement depths, estimate crustal compositions and identify the main depocenters, structures and limits of Acre Basin using an integrated analysis to understand better the region lithospheric evolution, its relationship with the Amazonian Craton and its positioning within the Andean orogeny. For that, we used well, 2D seismic reflection, airborne and ground gravity and magnetic data as well as the EMG2008. Tilt Depth estimates indicate basement depths between 500 and 7800 m and larger sedimentary thicknesses in the northern portion. Additionally, we modelled groups of potential sources between 0.1 and 22 km and Moho depths between 26 and 37 km.Compositionally, the upper crust consists dominantly of meta-sedimentary and low-grade metamorphic rocks and granites, indicating that the sub-Andean and Acre Basins share a similar basement. Thus, there are indications that the basement of the Acre Basin is essentially formed by the Sunsás province in the Amazonian Craton. However, local differences in basement depth, magnetic susceptibility and exploratory potential led to the subdivision into Divisor and Xapuri sub-basins, north and south of the Fitzcarrald Arch, respectively. Finally, it was possible to establish the limits of the Andean orogeny influence in the Acre Basin and delimit the area of the Western Amazon Foredeep installed during the Neogene.

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U–Pb geochronology and geochemistry of grenville-age plutons in the Sunsas Belt - Bolivia, SW Amazonian Craton: Tectonic and magmatic implications

Cited by 15 publications

References 71 publications

The late Mesoproterozoic to early Neoproterozoic Grenvillian orogeny and the assembly of Rodinia: Turning point in the tectonic evolution of Laurentia

The late Mesoproterozoic to early Neoproterozoic Grenvillian orogeny and the assembly of Rodinia: Turning point in the tectonic evolution of Laurentia

New Maps of Global Geological Provinces and Tectonic Plates

The Acre Basin basement (NW Brazil) and the transition from the intracratonic to retroarc foreland basin system

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