Timing of Proterozoic magmatism in the Sunsas belt, Bolivian Precambrian Shield, SW Amazonian Craton

Nedel, Ingrid M.; Fuck, Reinhardt A.; Ruiz, Amarildo Salina; Matos-Salinas, Gerardo R.; Ferreira, Alanielson

doi:10.1016/j.gsf.2021.101247

Cited by 8 publications

(8 citation statements)

References 72 publications

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“…1050 Ma monazite dates from the Sunsás belt on the craton margin indicates metamorphic reworking of the previously accreted Nova Brasilândia belt inboard of the margin during the collisional Sunsás orogeny at the margin (Quadros et al, 2020). In turn, this model supports the interpretation that the Grenville orogen and the Sunsás orogen were conjugates during the Ottawan phase (Nedel et al, 2021). These data are consistent with subduction under Amazonia (Quadros et al, 2020), with Amazonia as the upper plate and Laurentia as part of the lower subducting plate as in the preferred interpretation of Tohver et al (2006).…”

Section: Paleogeographic Modelsupporting

confidence: 69%

“…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%

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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

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 Modelsupporting

confidence: 69%

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 composite Paraguá Terrane has two domains (Paraguá and San Diablo) separated by a shear zone termed the San Diablo Front. Recent investigations in the San Diablo domain (southern domain of the Paraguá Terrane) have revealed the existence of Palaeoproterozoic meta‐igneous rocks with whole‐rock Sm–Nd and zircon U–Pb–Hf signatures similar to the Western domain of the RAT (Nedel, 2020; Nedel et al, 2021; Redes et al, 2020) (Figure 14a). The Chiquitania Group, a metasedimentary unit of the Paraguá Terrane intruded by the Lomas Maneches Suite, is characterized by detrital zircon U–Pb ages spanning 1910–1,690 Ma with a peak of c .…”

Section: Discussionmentioning

confidence: 99%

From microanalysis to supercontinents: Insights from the Rio Apa Terrane into the Mesoproterozoic SW Amazonian Craton evolution during Rodinia assembly

Ribeiro

Finch

Cawood

et al. 2021

Journal Metamorphic Geology

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The accepted version of an article is the version that incorporates all amendments made during the peer review process, but prior to the final published version (the Version of Record, which includes; copy and stylistic edits, online and print formatting, citation and other linking, deposit in abstracting and indexing services, and the addition of bibliographic and other material.Self-archiving of the accepted version is subject to an embargo period of 12-24 months. The standard embargo period is 12 months for scientific, technical, medical, and psychology (STM) journals and 24 months for social science and humanities (SSH) journals following publication of the final article. Use our Author Compliance Tool to check the embargo period for individual journals or check their copyright policy on Wiley Online Library.

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“…Map of South America showing the outline of Archean-Proterozoic cratons, the main geochronologic provinces of the Amazonian craton, the limits of orogenic fronts (i.e., Transamazonian, Rio Negro, Sunsás-San Ignacio, Andes), the location of pre-Neoproterozoic basement inliers within the Andes (a-j), the location of Neoproterozoic ophiolites (u-z) and oceanic tracts, and recent oceanic ridges and fracture zones (compiled and modified after Jacques, 2003;Loewy et al, 2004;Santos et al, 2004;Cordani et al, 2010;2016;Teixeira et al, 2010;Bettencourt et al, 2010;Rapela et al, 2010;Ibanez-Mejia et al, 2011;Escayola et al, 2011;Tassinari et al, 2011;Casquet et al, 2012;Rizzotto and Hartmann, 2012;de Castro et al, 2014;Ramos et al, 2015;Kroonenberg et al, 2016;Ramos, 2018;da Silva et al, 2018;Gómez et al, 2019;Motta et al, 2019;Rocha et al, 2019;López et al, 2020;Nedel et al, 2021;Assis et al, 2021;Wiemer et al, 2022). Note: both the extended (including the Parana basin, PPB; Santos et al, 2019), and the limited extent (RdlP limit; Rapela et al, 2011) of the Rio de la Plata craton are indicated.…”

Section: Figurementioning

confidence: 99%

Cryptic trans-lithospheric fault systems at the western margin of South America: implications for the formation and localization of gold-rich deposit superclusters

Wiemer,

Hagemann,

Hayward

et al. 2023

Front. Earth Sci.

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We present a review of frontier research advances in the investigation of cryptic structures that transect the South American Andes at oblique strike directions. The intersections between these cryptic structures and the superimposed Andean belt correlate with the spatial distribution of gold-rich mineral deposit clusters. The deposit clusters can be described as superclusters, as they comprise various gold deposit types that formed at multiple times throughout the Phanerozoic, impinging repeatedly on the structural intersections. However, the cryptic inherited fault structures are difficult to detect, because their deeper-seated roots are often overlain by younger supracrustal successions, and/or their exposed surface manifestations are structurally obscured by subsequent tectonic-magmatic activity. Thus, it also remains a challenge to constrain the nature and timing of formation, and the respective subsequent evolutionary path, of these proposed pre-Andean structures. Based on various case studies, we demonstrate that the localization of identified Phanerozoic gold deposit superclusters along the western South American margin is fundamentally controlled by structural inheritance often dating back to at least the Mesoproterozoic. Integration of multi-approach observations and datasets allows insights into a larger-scale tectonic history that showcases the successive inheritance of major structures originating from the Amazonian Craton, over the Paleozoic Gondwana margin, into the Cenozoic magmatic belts of the Andes, and even into recent fractures within the subducting oceanic Nazca plate, recording >1.2-billion-years of progressive structural inheritance and growth at one of the longest-lived tectonic margins in Earth history. In contrast to previous models of the spatial distribution of gold deposits, based on statistical approaches and spatial periodicity in self-organized systems focusing on single subduction and/or accretion episodes and belts, we propose that the structural inheritance and intersections are key to the localization of gold deposits in the Andes. In combination with bulk-geochemical data from magmatic rocks, we suggest that inherited structures maintained a trans-lithospheric connectivity to pre-fertilized gold enriched upper mantle reservoirs, which were tapped during multiple tectono-magmatic reactivation episodes.

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Timing of Proterozoic magmatism in the Sunsas belt, Bolivian Precambrian Shield, SW Amazonian Craton

Cited by 8 publications

References 72 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

From microanalysis to supercontinents: Insights from the Rio Apa Terrane into the Mesoproterozoic SW Amazonian Craton evolution during Rodinia assembly

Cryptic trans-lithospheric fault systems at the western margin of South America: implications for the formation and localization of gold-rich deposit superclusters

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