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Статті в журналах з теми "Gondwana; Brazil; Paraguay Belt"

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Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 28 січня 2023

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1

Barboza, Elzio Da Silva, Anderson Costa dos Santos, Carlos José Fernandes, and Mauro César Geraldes. "PARAGUAY BELT LITHOSTRATIGRAPHIC AND TECTONIC CHARACTERIZATION: IMPLICATIONS IN THE EVOLUTION OF THE OROGEN (MATO GROSSO-BRAZIL) / CARACTERIZAÇÃO LITOESTRATIGRÁFICA E TECTÔNICA DO CINTURÃO PARAGUAY : IMPLICAÇÕES NA EVOLUÇÃO DO ORÓGENO (MATO GROSSO-BRASIL)." Journal of Sedimentary Environments 3, no. 2 (May 17, 2018): 54–73. http://dx.doi.org/10.12957/jse.2018.34219.

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The Paraguay Belt is composed by sediments deposited due to extensional events followed by inversion with deformation and magmatism and lastly collision of the Amazonian Craton and Paranapanema Block. The marine sedimentation, with Neoproterozoic ages, should have occurred in a continental shelf region, at about 800-550 Ma, when the closing of many oceans gave place to the amalgamation of the Gondwana supercontinent. Three areas were selected for this study which configuration define the perpendicular profile of the Paraguay Belt and allow the characterization of the main regional structures.The structural analysis in the sites here reported and surrounding areas allow suggesting that three deformational events are recorded in the rocks of this region. The sedimentary bedding S0, marked by alternations of dark gray and whitish coloration in the seritic phyllites is folded and the axial plane (Sn) is marked by a cleavage of ardosian. These surfaces are cut by two other deformations, Sn + 1 surface that plunges at high angles to SE as fracture cleavage and Sn + 2 that is orthogonal to the previous deformations and has NW-SE direction with vertical dips, where sometimes occurs quartz veins with high gold content. The Paraguay Belt fan geometry observed in the Sn foliation was developed during the closing of a Brazilian ocean that evolved between the Paranapanema Block and the Amazonian Craton. ResumoO Cinturão Paraguai é composto por sedimentos depositados durante eventos extencionais seguidos de inversão com deformação e magmatismo e, por último, colisão do Craton Amazônico e do Bloco Paranapanema. A sedimentação marinha, com idades Neoproterozóicas, ocorreu em uma região de plataforma continental, entre 800-550 Ma, quando o fechamento de muitos oceanos deu lugar à fusão do supercontinente Gondwana. Três áreas foram selecionadas para este estudo cuja configuração define um perfil perpendicular do Cinturão do Paraguai e permite a caracterização das principais estruturas regionais.A análise estrutural nos locais aqui relatados e áreas adjacentes permite sugerir que as rochas do orógeno passou por três eventos deformacionais. O acamamento sedimentar S0, marcado por alternâncias de coloração cinza-escura e esbranquiçada nos filitos e siltitos, é dobrado e o plano axial (Sn) é marcado por uma clivagem ardosiana. Estas superfícies são cortadas por outras duas deformações, Sn + 1 que mergulha em ângulos elevados para SE como clivagem de fratura e Sn + 2 que é ortogonal às deformações anteriores e tem direção NW-SE com mergulhos verticais, onde às vezes ocorrem veios de quartzo com alto teor de ouro. A geometria em leque do Cinturão Paraguay observada na foliação de Sn foi desenvolvida durante o fechamento de um oceano brasileiro que evoluiu entre o Bloco Paranapanema e o Craton Amazônico.
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2

McGee, Ben, Marly Babinski, Ricardo Trindade, and Alan S. Collins. "Tracing final Gondwana assembly: Age and provenance of key stratigraphic units in the southern Paraguay Belt, Brazil." Precambrian Research 307 (April 2018): 1–33. http://dx.doi.org/10.1016/j.precamres.2017.12.030.

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3

Babinski, Marly, Ben McGee, Cláudia do Couto Tokashiki, Colombo C. G. Tassinari, Gerson Souza Saes, and Francisco Egidio Cavalcante Pinho. "Comparing two arms of an orogenic belt during Gondwana amalgamation: Age and provenance of the Cuiabá Group, northern Paraguay Belt, Brazil." Journal of South American Earth Sciences 85 (August 2018): 6–42. http://dx.doi.org/10.1016/j.jsames.2018.04.009.

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4

Manoel, Talitta Nunes, David Selby, Matthieu Emmanuel Galvez, Jayme Alfredo Dexheimer Leite, and Luan Nonato Figueiredo. "A pre-Sturtian depositional age of the lower Paraguay Belt, Western Brazil, and its relationship to western Gondwana magmatism." Gondwana Research 89 (January 2021): 238–46. http://dx.doi.org/10.1016/j.gr.2020.10.002.

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5

da Silva, Marcelo Ferreira, Elton Luiz Dantas, Massimo Matteini, and Ricardo I. F. Trindade. "Late Tonian explosive volcanism and hyaloclastites in northern Paraguay Belt, Central Brazil: A record of Rodinia break-up in western Gondwana." Precambrian Research 382 (November 2022): 106862. http://dx.doi.org/10.1016/j.precamres.2022.106862.

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6

McGee, Ben, Alan S. Collins, Ricardo I. F. Trindade, and Fred Jourdan. "Investigating mid-Ediacaran glaciation and final Gondwana amalgamation using coupled sedimentology and40Ar/39Ar detrital muscovite provenance from the Paraguay Belt, Brazil." Sedimentology 62, no. 1 (October 3, 2014): 130–54. http://dx.doi.org/10.1111/sed.12143.

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7

McGee, Ben, Alan S. Collins, and Ricardo I. F. Trindade. "G'day Gondwana — the final accretion of a supercontinent: U–Pb ages from the post-orogenic São Vicente Granite, northern Paraguay Belt, Brazil." Gondwana Research 21, no. 2-3 (March 2012): 316–22. http://dx.doi.org/10.1016/j.gr.2011.04.011.

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8

dos Santos, Iara Maria, Roberto Vizeu L. Pinheiro, Robert E. Holdsworth, Afonso Cesar R. Nogueira, Hudson Pereira Santos, and Fabio Henrique G. Domingos. "Basement–cover relationships and deformation in the Northern Paraguai Belt, central Brazil: implications for the Neoproterozoic–early Paleozoic history of western Gondwana." Journal of the Geological Society 177, no. 3 (November 19, 2019): 475–91. http://dx.doi.org/10.1144/jgs2018-184.

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9

BARBOZA, Elzio da Silva, Mauro Cesar GERALDES, Francisco Egídio Cavalcante PINHO, Carlos José FERNANDES, and Carlos Humberto da SILVA. "STRUCTURAL, STRATIGRAPHIC AND METALLOGENETIC ASPECTS OF THE PARAGUAY FOLD AND THRUST BELT: IMPLICATIONS FOR GOLD MINERALIZATION AND COLLAGE OF THE GONDWANA." Geosciences = Geociências 39, no. 2 (July 16, 2020): 279–96. http://dx.doi.org/10.5016/geociencias.v39i2.12699.

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ABSTRACT - Paraguay Belt occupies the western portion of the Tocantins Province, surrounding the Southeast of the Amazonian Craton and the eastern border of the Rio Apa Block, suggesting continuity with Tucavaca Belt in Bolivia. The rocks of the Paraguay belt were initially deposited in a glaciomarine environment in sites proximal to the cratonic area and deeper marine under the influence of turbidite flows in distal sites (Cuiabá Group, Bauxi and Puga Formation). The cap carbonates, thick limestone and dolostone succession of the Araras Group and siltstones and diamictites of the Serra Azul Formation related to Glaskiers glaciation overlay these diamictites (related to Marinoan glaciation). On the top there are terrigenous sediments of the Alto Paraguay Group, represented by sandstones of Raizama and claystones of Diamantino formations, respectively. The belt can be divided into three distinct structural zones: The Internal Domain is comprised of turbidite and glaciogenic sequences. Glaciogenic rocks on the base and carbonaceous and terrigenous sediments on the top occur in the External Domain. Horizontal platformal cover on the Amazonian Craton rocks are characterized by open folds. Structural studies allowed characterization of continuous deformational phases: the main deformational phase generated regional inverse folds with a NE-SW trend and fan geometry. Several regionally widespread lode-type gold deposits related to four types of the quartz veins were identified: type 1 is in concordance to bedding, type 2 is parallel to Sn, type 3 is parallel to Sn+2, and vertical Type 4 (Au-rich) is orthogonal to Sn. Late deformation developed in the Cuiabá region, recorded the closure of the ocean and the invertion where the hydrothermal fluids are the responsible for the orebodies formation. Keywords: Paraguay Belt, Structural, Stratigraphy, Metalogenesis.
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10

Figueiredo, Milene F., Marly Babinski, and Carlos J. S. Alvarenga. "Chapter 46 The Serra Azul Formation, Paraguay Belt, Brazil." Geological Society, London, Memoirs 36, no. 1 (2011): 499–502. http://dx.doi.org/10.1144/m36.46.

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11

Manoel, Talitta Nunes, and Jayme Alfredo Dexheimer Leite. "On the origin of the Neoproterozoic Peresopolis graphite deposit, Paraguay Belt, Brazil." Journal of South American Earth Sciences 84 (July 2018): 104–12. http://dx.doi.org/10.1016/j.jsames.2018.03.007.

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12

Valeriano, C. M., M. M. Pimentel, M. Heilbron, J. C. H. Almeida, and R. A. J. Trouw. "Tectonic evolution of the Brasília Belt, Central Brazil, and early assembly of Gondwana." Geological Society, London, Special Publications 294, no. 1 (2008): 197–210. http://dx.doi.org/10.1144/sp294.11.

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13

Hackspacher, P. C., C. Juliani, A. Fetter, and E. L. Dantas. "Evolution of the Central Ribeira Belt, Brazil: Implications for the Assembly of West Gondwana." Gondwana Research 4, no. 4 (October 2001): 626–27. http://dx.doi.org/10.1016/s1342-937x(05)70430-5.

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14

Gomes, Cristiane H., and Delia Almeida. "New insights into the Gondwana breakup at the Southern South America by apatite fission-track analyses." Advances in Geosciences 47 (January 21, 2019): 1–15. http://dx.doi.org/10.5194/adgeo-47-1-2019.

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Abstract. Apatite fission-track (AFT) analyses, applied to Southern Brazil and Uruguay samples, was employed aiming to understand the low temperature history of the Dom Feliciano Belt Segment. The Dom Feliciano Belt formed during the Neoproterozoic to Early Paleozoic, linked to the Brasiliano/Pan-African Orogeny. Twenty-four samples were dated, and confined track lengths of twenty samples were measured. The spatial distribution of ages shows three domains with different evolution cut by shear zones and, or suture zones in the Dom Feliciano Belt. The Western Domain exhibits AFT ages > 250 Ma (Permian to Devonian) while the Eastern Domain shows AFT ages < 230 Ma (Paleogene to Triassic). In the Central Domain, the AFT ages range from ∼196 to 130 Ma (Jurassic to Early Cretaceous). The thermal modeling in the domains revealed a complex evolution, with cooling and reheating phases, and a denudation of ∼2600 m. The AFT ages clearly postdate the Gondwanide, Paraná-Etendeka and Rio Grande Cone exhumation history of the Dom Feliciano Belt.
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15

Riccomini, Claudio, Afonso C. R. Nogueira, and Alcides N. Sial. "Carbon and oxygen isotope geochemistry of Ediacaran outer platform carbonates, Paraguay Belt, central Brazil." Anais da Academia Brasileira de Ciências 79, no. 3 (September 2007): 519–27. http://dx.doi.org/10.1590/s0001-37652007000300012.

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After the late Cryogenian glaciation the central region of Brazil was the site of extensive deposition of platformal carbonates of the Araras Group. This group includes a basal cap carbonate sequence succeeded by transgressive, deep platform deposits of bituminous lime mudstone and shale. Facies and stratigraphic data combined with carbon and oxygen isotopic analyses of the most complete section of the transgressive deposits, exposed in the Guia syncline, were used to evaluate the depositional paleoenvironment and to test the correlation of these deposits along the belt and with other units worldwide. The studied succession consists of 150 m thick tabular beds of black to grey lime mudstone and shale with predominantly negative delta13C PDB values around -2.5 to -1‰ . The delta13C PDB profile of Guia syncline shows a clear correlation with the upper portion of Guia Formation in the Cáceres region, about 200 km to the southwest. The delta13C PDB profile of the Araras Group is comparable with delta13C PDB profiles of Ediacaran units of the southern Paraguay Belt, western Canada, and the Congo and Kalahari cratons. Moreover, facies distribution, stratigraphy and the carbon isotopic profile of the Araras Group match the middle Tsumeb Subgroup in Namibia, which reinforces the Ediacaran age assigned to the Araras Group.
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16

de Alvarenga, Carlos J. S., and Roland Trompette. "Glacially influenced sedimentation in the Later Proterozoic of the Paraguay belt (Mato Grosso, Brazil)." Palaeogeography, Palaeoclimatology, Palaeoecology 92, no. 1-2 (March 1992): 85–105. http://dx.doi.org/10.1016/0031-0182(92)90136-s.

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17

Oliveira, Elson P., Brian F. Windley, and Mario N. C. Araújo. "The Neoproterozoic Sergipano orogenic belt, NE Brazil: A complete plate tectonic cycle in western Gondwana." Precambrian Research 181, no. 1-4 (August 2010): 64–84. http://dx.doi.org/10.1016/j.precamres.2010.05.014.

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18

GERALDES, M. C., A. C. SANTOS, W. H. SANTOS, and C. TASSINARI. "40Ar/39Ar Cooling Ages of the Paraguay Belt in the Nova Xavantina Region (MT): Tectonic Implications for Western Gondwana Collage." Anuário do Instituto de Geociências - UFRJ 41, no. 3 (December 4, 2018): 351–62. http://dx.doi.org/10.11137/2018_3_351_362.

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19

Reuber, Kyle, and Paul Mann. "Control of Precambrian-to-Paleozoic orogenic trends on along-strike variations in Early Cretaceous continental rifts of the South Atlantic Ocean." Interpretation 7, no. 4 (November 1, 2019): SH45—SH69. http://dx.doi.org/10.1190/int-2018-0257.1.

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The Early Cretaceous (135–130 Ma) continental rupture of Western Gondwana to form the South American and African plates closely paralleled the elongate trends of Precambrian and Paleozoic orogenic belts. These orogenic belts were produced as a result of the Neoproterozoic convergent and strike-slip assembly of Gondwana that redeformed during later, Paleozoic orogenic events. Continued continental rifting led to the formation of conjugate, South Atlantic volcanic passive margins whose widths vary from 55 to 180 km. Along-strike variations in crustal stretching, as measured from deep-penetration seismic reflection profiles, correlate with parallel and oblique orientations of rifts relative to the trend of the orogenic, basement fabric. Where orogenic fabric trends parallel to the north–south South Atlantic rift direction such as in the Dom Feliciano orogenic belt of Uruguay and Brazil and the Kaoko Uruguay/Brazil and Kaoko orogenic belt of Namibia, we observe narrow (55–90 km) rift zones with modest continental beta factors of 2.5–3.5 because smaller amounts of rifting were needed to stretch the weaker and parallel, orogenic, basement fabric. Where the basement fabric trends near-orthogonally to the north–south South Atlantic rift direction such as in the Salado suture of Southern Uruguay and the Damara Belt of Namibia, we observe wider (185–220 km) rift zones with higher beta factors of 4.3–5 because greater amounts of stretching were needed to rupture the orthogonal, orogenic, basement fabric. The rift-oblique Gariep Belt intersects the South Atlantic continental rupture at an intermediate angle (30°) and exhibits a predicted intermediate beta factor of 4.0. A compilation of published beta factors from 36 other rifted margins worldwide supports the same basement-trend-degree of stretching relationship that we have developed — with rift-parallel margins having lower beta factors in a range of 1.3–3.5 and rift-orthogonal or oblique margins having higher beta factors in a range of 4–8.
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20

Almeida, Gabriela M., Reinhardt A. Fuck, Darby P. D. de Lima, and Elton L. Dantas. "Accretion tectonics in Western Gondwana highlighted by the aeromagnetic signature of the Sergipano Belt, NE Brazil." Tectonophysics 802 (March 2021): 228742. http://dx.doi.org/10.1016/j.tecto.2021.228742.

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21

Tupinambá, Miguel, Monica Heilbron, Claudio Valeriano, Rubem Porto Júnior, Fátima Blanco de Dios, Nuno Machado, Luiz Guilherme do Eirado Silva, and Júlio Cesar Horta de Almeida. "Juvenile contribution of the Neoproterozoic Rio Negro Magmatic Arc (Ribeira Belt, Brazil): Implications for Western Gondwana amalgamation." Gondwana Research 21, no. 2-3 (March 2012): 422–38. http://dx.doi.org/10.1016/j.gr.2011.05.012.

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22

Schmitt, R. S., R. A. J. Trouw, W. R. Van Schmus, and C. W. Passchier. "Cambrian orogeny in the Ribeira Belt (SE Brazil) and correlations within West Gondwana: ties that bind underwater." Geological Society, London, Special Publications 294, no. 1 (2008): 279–96. http://dx.doi.org/10.1144/sp294.15.

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23

de Alvarenga, Carlos J. S., Milene F. Figueiredo, Marly Babinski, and Francisco E. C. Pinho. "Glacial diamictites of Serra Azul Formation (Ediacaran, Paraguay belt): Evidence of the Gaskiers glacial event in Brazil." Journal of South American Earth Sciences 23, no. 2-3 (February 2007): 236–41. http://dx.doi.org/10.1016/j.jsames.2006.09.015.

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24

Pimentel, Márcio Martins. "The tectonic evolution of the Neoproterozoic Brasília Belt, central Brazil: a geochronological and isotopic approach." Brazilian Journal of Geology 46, suppl 1 (June 2016): 67–82. http://dx.doi.org/10.1590/2317-4889201620150004.

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ABSTRACT: The Brasília Belt is one of the most complete Neoproterozoic orogens in western Gondwana. Rapid progress on the understanding of the tectonic evolution of the belt was achieved due to new U-Pb data, combined with Sm-Nd and Lu-Hf analyses. The evolution of the Brasília orogen happened over a long period of time (900 - 600 Ma) involving subduction, magmatism and terrain accretion, as a result of the consumption of the Goiás oceanic lithosphere. Provenance studies, based on U-Pb zircon data, indicate that the sedimentary rock units record different tectonic settings and stages of the evolution of the orogen. The Paranoá and Canastra groups represent passive margin sequences derived from the erosion of the São Francisco Craton. The Araxá and Ibiá groups, however, have dominant Neoproterozoic detrital zircon populations, as young as 650 Ma, suggesting derivation from the Goiás Magmatic Arc. The Goiás Magmatic Arc represents a composite arc terrain, formed by the accretion of older (ca. 0.9 - 0.8 Ga) intraoceanic island arc(s), followed by more evolved continental arcs. It extends for several thousand kilometers, from SW Goiás, through NE Brazil and into Africa. Metamorphism took place between 650 - 630 Ma reflecting final closure of the Goiás Ocean and continental collision.
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25

Meira, Vinícius T., Antonio García-Casco, Caetano Juliani, Renato P. Almeida, and Johann Hans D. Schorscher. "The role of intracontinental deformation in supercontinent assembly: insights from the Ribeira Belt, Southeastern Brazil (Neoproterozoic West Gondwana)." Terra Nova 27, no. 3 (April 7, 2015): 206–17. http://dx.doi.org/10.1111/ter.12149.

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26

de Alvarenga, Carlos J. S., Roberto V. Santos, and Elton L. Dantas. "C–O–Sr isotopic stratigraphy of cap carbonates overlying Marinoan-age glacial diamictites in the Paraguay Belt, Brazil." Precambrian Research 131, no. 1-2 (May 2004): 1–21. http://dx.doi.org/10.1016/j.precamres.2003.12.006.

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27

Kent, Dennis V., and Lars B. Clemmensen. "Northward dispersal of dinosaurs from Gondwana to Greenland at the mid-Norian (215–212 Ma, Late Triassic) dip in atmospheric pCO2." Proceedings of the National Academy of Sciences 118, no. 8 (February 16, 2021): e2020778118. http://dx.doi.org/10.1073/pnas.2020778118.

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The earliest dinosaurs (theropods and sauropodomorphs) are found in fossiliferous early Late Triassic strata dated to about 230 million years ago (Ma), mainly in northwestern Argentina and southern Brazil in the Southern Hemisphere temperate belt of what was Gondwana in Pangea. Sauropodomorphs, which are not known for the entire Triassic in then tropical North America, eventually appear 15 million years later in the Northern Hemisphere temperate belt of Laurasia. The Pangea supercontinent was traversable in principle by terrestrial vertebrates, so the main barrier to be surmounted for dispersal between hemispheres was likely to be climatic; in particular, the intense aridity of tropical desert belts and unstable climate in the equatorial humid belt accompanying high atmospheric pCO2 that characterized the Late Triassic. We revisited the chronostratigraphy of the dinosaur-bearing Fleming Fjord Group of central East Greenland and, with additional data, produced a correlation of a detailed magnetostratigraphy from more than 325 m of composite section from two field areas to the age-calibrated astrochronostratigraphic polarity time scale. This age model places the earliest occurrence of sauropodomorphs (Plateosaurus) in their northernmost range to ∼214 Ma. The timing is within the 215 to 212 Ma (mid-Norian) window of a major, robust dip in atmospheric pCO2 of uncertain origin but which may have resulted in sufficiently lowered climate barriers that facilitated the initial major dispersal of the herbivorous sauropodomorphs to the temperate belt of the Northern Hemisphere. Indications are that carnivorous theropods may have had dispersals that were less subject to the same climate constraints.
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28

Koester, Edinei, Carla Cristine Porcher, Rodrigo Chaves Ramos, Daniel Triboli Vieira, Laércio Dal Olmo-Barbosa, and Vivianne Andrade Bastos. "Paleoproterozoic metagabbro xenolith in the southeastern Dom Feliciano Belt, southern Brazil: A new piece in the West Gondwana assembly." Journal of South American Earth Sciences 119 (November 2022): 104040. http://dx.doi.org/10.1016/j.jsames.2022.104040.

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29

Valeriano, Claudio M., Nuno Machado, Antonio Simonetti, Claudia S. Valladares, Hildor J. Seer, and Luiz Sergio A. Simões. "U–Pb geochronology of the southern Brası́lia belt (SE-Brazil): sedimentary provenance, Neoproterozoic orogeny and assembly of West Gondwana." Precambrian Research 130, no. 1-4 (April 2004): 27–55. http://dx.doi.org/10.1016/j.precamres.2003.10.014.

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30

Campanha, G. A. C., F. M. Faleiros, P. A. Cawood, D. I. G. Cabrita, B. V. Ribeiro, and M. A. S. Basei. "The Tonian Embu Complex in the Ribeira Belt (Brazil): revision, depositional age and setting in Rodinia and West Gondwana." Precambrian Research 320 (January 2019): 31–45. http://dx.doi.org/10.1016/j.precamres.2018.10.010.

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31

Passarelli, Cláudia R., Sanjeet K. Verma, Ian McReath, Miguel A. S. Basei, and Oswaldo Siga. "Tracing the history from Rodinia break-up to the Gondwana amalgamation in the Embu Terrane, southern Ribeira Belt, Brazil." Lithos 342-343 (October 2019): 1–17. http://dx.doi.org/10.1016/j.lithos.2019.05.024.

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RENO, BARRY L., MICHAEL BROWN, KATSURA KOBAYASHI, EIZO NAKAMURA, PHILIP M. PICCOLI, and RUDOLPH A. J. TROUW. "Eclogite–high-pressure granulite metamorphism records early collision in West Gondwana: new data from the Southern Brasília Belt, Brazil." Journal of the Geological Society 166, no. 6 (December 2009): 1013–32. http://dx.doi.org/10.1144/0016-76492008-140.

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33

Ramos, Rodrigo Chaves, and Edinei Koester. "Lithogeochemistry of the meta-igneous units from Arroio Grande Ophiolitic Complex, southernmost Brazil." Brazilian Journal of Geology 45, no. 1 (March 2015): 65–78. http://dx.doi.org/10.1590/23174889201500010005.

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Анотація:
Ophiolites are defined as slices of genetically-related upper mantle serpentinized peridotites and oceanic crustal rocks, tectonically displaced from its primary igneous origin of formation by plate convergence and associated (meta) sedimentary rocks of marine origin. From this premise, a meta-ultramafic-mafic-sedimentary complex (Cr-rich magnesian schists - upper mantle or crustal ultramafic cumulate candidates; epidote amphibolites, metadiorites and metagabbros - oceanic crust candidates; metasedimentary schists, quartzites and marbles - marine sedimentary rocks candidates), located in southeastern Dom Feliciano Belt (southernmost Brazil), started to be interpreted as possible slices of an ophiolitic complex related to the closure of a paleo-ocean during Brasiliano/Pan-African orogenic cycle and was called Arroio Grande Ophiolitic Complex. The present research fills the lack of geochemical data from previous studies and tests the hypothesis of an oceanic setting for the meta-igneous units of this complex from a lithogeochemistry point of view. The meta-ultramafics were interpreted as peridotites (mantle or crustal cumulates) that were subsequently serpentinized (probably in the ocean floor) and posteriorly metasomatized (probably in a continental setting). The meta-mafics were interpreted as oceanic gabbros/basalts formed in a back-arc basin. The results, together with field relationships, rock associations and petrographic evidences, support an oceanic origin for the protoliths of the meta-igneous units. The hypothesis that these rocks represent metamorphosed slices of an ophiolitic complex is still the most reasonable one. This work updates the geologic knowledge of the area and supports discussions about the evolution of Dom Feliciano Belt and Western Gondwana paleocontinent.
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Machado, Marcos Da Silva, Guilherme Loriato Potratz, Marcio Ignacio Alves, Bruna Saar Almeida, Mauro Cesar Geraldes, Armando Dias Tavares Jr, Alexis Rosa Nummer, Camila Cardoso Nogueira, and Anderson Da Costa Santos. "SHRIMP U-PB DATA OF THE PALEOPROTEROZOIC, REGIÃO DOS LAGOS COMPLEX, RIO DE JANEIRO, BRAZIL: IMPLICATIONS TO RIBEIRA BELT EVOLUTION." Journal of Sedimentary Environments 2, no. 4 (February 1, 2008): 301–18. http://dx.doi.org/10.12957/jse.2017.32650.

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The studied region is located in the Rio de Janeiro State (SE, Brazil) and is part of the Ribeira Belt, in the central portion of the Mantiqueira Province. The rocks of this region were included in the Brasiliano/Pan-African orogeny, from Neoproterozoic to the early Paleozoic. The basement is comprised of Paleoproterozoic rocks, sedimentary and volcano-sedimentary rocks from Mesoproterozoic and Neoproterozoic and intrusive granitic rocks from the Neoproterozoic. These rocks are interpreted as associations of magmatic arcs, sedimentary sequences of passive margins and tardi-kinematic granites, respectively. The study area is located in Cabo Frio Terrane, where the basement is represented by the Região dos Lagos Complex.The Região dos Lagos Complex can be divided into: granitic rocks (biotite-orthoclase-plagioclase gneiss), tonalitic rocks (biotite-microcline-plagioclase gneiss). The main aims of the SHRIMP U-Pb zircon studies of the Região dos Lagos Complex is to identify the crystallization ages of this complex and to define the magmatic events in the Ribeira Belt. The obtained U-Pb ages are: sample CRL-04, 1960 ± 19 Ma; sample CRL-05, 1986 ± 24 Ma; sample CRL-06, 1985 ± 34 Ma; sample CRL-07, 1942 ± 16 Ma; sample CRL-08, 1970 ± 17 Ma and; sample CRL-09, 1989 ± 22 Ma.These results suggest that the Região dos Lagos complex has crystallization from 1989 Ma to 1942 Ma, and was formed during an important magmatic event related to the Ribeira Belt formed previously to the Gondwana amalgamation probably related to Congo craton basement.
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35

Bandeira, José, Ben McGee, Afonso C. R. Nogueira, Alan S. Collins, and Ricardo Trindade. "Sedimentological and provenance response to Cambrian closure of the Clymene ocean: The upper Alto Paraguai Group, Paraguay belt, Brazil." Gondwana Research 21, no. 2-3 (March 2012): 323–40. http://dx.doi.org/10.1016/j.gr.2011.04.006.

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36

Batalha, Raíza De Sousa, Elzio Da Silva Barboza, Carlos Humberto, Cláudia Do Couto Tokashiki, Francisco Egídio Cavalcante Pinho, and Mauro César Geraldes. "LITHOSTRATIGRAPHIC CONTROL OF THE CANGAS-POCONÉ LINEAMENT AURIFEROUS DEPOSITS (PARAGUAY BELT): IMPLICATIONS FOR REGIONAL EXPLORATION." Journal of Sedimentary Environments 4, no. 4 (December 15, 2019): 501–17. http://dx.doi.org/10.12957/jse.2019.47328.

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rocks of the Cuiaba Group, into the inner portion of the Paraguay Belt (Brazil). They occur in a belt (~1200 m) where the host rocks are graphitic phyllites, metadiamictites, metasiltites and sandstones metamorphosed in greenschist facies. In these deposits gold occurs free or included in pyrite related to three types of quartz veins, parallel to Sn (V1), parallel to Sn+1 (V2) and orthogonal (V3) which are rich in gold. The study of outcrops in regional profiles, open mines for gold exploration and drilling holes in the Cangas-Poconé alignment indicate that the preferential location of gold mineralization at (Cangas Facies) is related to the existence of strong lithological control of the mineralizations.The Cangas facies present low permeability of rhythmite, structural arrangement of permeability barriers S0 and S1 at high angle with respect to the fluid migration path and mainly the presence of ferruginous levels acting as geochemical barriers for precipitation of metals in solution in the fluid. The knowledge that gold concentration is related to sedimentary control is important for regional exploration and is a guide for local miners. CONTROLE LITOSTRATIGRÁFICO DOS DEPÓSITOS AURÍFEROS DO LINEAMENTO CANGAS-POCONÉ (CINTURÃO PARAGUAI): IMPLICAÇÕES PARA A EXPLORAÇÃO REGIONAL ResumoOs depósitos de Cangas-Poconé estão hospedados em rochas metassedimentares do Grupo Cuiabá, na porção interna do Cinturão do Paraguai (Brasil). Eles ocorrem em um cinturão (~ 1200 m), onde as rochas hospedeiras são filitos, metadiamictitos, metasiltitos e arenitos grafitados, metamorfoseados em fácies de xisto verde. Nesses depósitos, o ouro ocorre livre ou incluído em pirita relacionada a três tipos de veios de quartzo. O estudo de afloramentos em perfis regionais, minas abertas para exploração de ouro e perfurações no alinhamento Cangas-Poconé indica que a localização preferencial da mineralização de ouro em (Cangas Facies) está relacionada à existência de forte controle litológico.O conhecimento de que a mineralização de ouro está relacionada ao controle sedimentar é importante para a exploração regional e é um guia para os mineradores locais. Palavras-chave: Ouro. Controle Sedimentar. Grupo Cuiabá. Cinturão do Paraguai.
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37

Cordani, U. G., W. Teixeira, C. C. G. Tassinari, J. M. V. Coutinho, and A. S. Ruiz. "The Rio Apa Craton in Mato Grosso do Sul (Brazil) and northern Paraguay: Geochronological evolution, correlations and tectonic implications for Rodinia and Gondwana." American Journal of Science 310, no. 9 (November 1, 2010): 981–1023. http://dx.doi.org/10.2475/09.2010.09.

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38

C.A. NETO, CARLA, CLAUDIO M. VALERIANO, CLAUDIA R. PASSARELLI, MONICA HEILBRON, and MARCELA LOBATO. "Monazite ID-TIMS U-Pb geochronology in the LAGIR laboratory, Rio de Janeiro State University: protocols and first applications to the assembly of Gondwana supercontinent in SE-Brazil." Anais da Academia Brasileira de Ciências 86, no. 1 (March 2014): 171–86. http://dx.doi.org/10.1590/0001-3765201420120005.

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The chemical and spectrometric procedures of the U-Pb geochronology method on monazites, recently installed in the LAGIR laboratory, are described in detail. In addition, preliminary results on monazite samples from the Brasília and Ribeira belts are reported and discussed in the context of the regional geology. Several experiments for calibration of ion exchange chromatographic columns with the AG-1x8 resin, were performed with HCl, using dissolved natural monazite samples. The Pb blanks of reagents are ∼0.5 pg/g in acids and ∼1 pg/g in H2O. The total Pb blanks in chemical procedures were below 22 pg. Preliminary results are presented from three case studies related to Brasiliano orogenic belts of SE-Brazil, which correlate very well with previous age determinations from literature: two sub-concordant grains from an Araxá Group quartzite (southern Brasília belt) define a concordia age of 602.6 ±1.4 Ma; a -0.8% discordant grain from a quartzite of the São Fidelis Group (Costeiro Domain, central Ribeira belt) yielded a concordia age of 535.3 ± 2.4 Ma; two 0.4 % and 1.3 % discordant monazite grains from the post-collisional Itaoca Granite (Costeiro Domain, central Ribeira belt) define a concordia age of 476.4 ± 1.8 Ma.
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39

McGee, Ben, Alan S. Collins, Ricardo I. F. Trindade, and Justin Payne. "Age and provenance of the Cryogenian to Cambrian passive margin to foreland basin sequence of the northern Paraguay Belt, Brazil." Geological Society of America Bulletin 127, no. 1-2 (July 30, 2014): 76–86. http://dx.doi.org/10.1130/b30842.1.

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40

Babinski, M., P. C. Boggiani, R. I. F. Trindade, and C. M. Fanning. "Detrital zircon ages and geochronological constraints on the Neoproterozoic Puga diamictites and associated BIFs in the southern Paraguay Belt, Brazil." Gondwana Research 23, no. 3 (April 2013): 988–97. http://dx.doi.org/10.1016/j.gr.2012.06.011.

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41

Silva, Luiz José Homem D'el-Rey, Detlef Hans-Gerd Walde, and Davi Oliveira Saldanha. "The Neoproterozoic–Cambrian Paraguay Belt, central Brazil: Part I — New structural data and a new approach on the regional implications." Tectonophysics 676 (April 2016): 20–41. http://dx.doi.org/10.1016/j.tecto.2016.03.019.

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42

Iocca, Sérgio Raffael Silva, and Sérgio Junior da Silva Fachin. "Application of the Euler deconvolution 2D and 3D at the Pari syncline, internal area of the Paraguay Belt, Mato Grosso, Brazil." Geologia USP. Série Científica 21, no. 3 (October 4, 2021): 75–84. http://dx.doi.org/10.11606/issn.2316-9095.v21-163509.

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Among the several techniques that allow the estimation of mean depths from airborne geophysical magnetic data, the Euler deconvolution became popular due to the high level of reliability in the generated data. With the use of this tool, it is possible to study structures remotely at different crustal levels that may or may not contain mineralization, consequently being able to determine potential targets for mineral exploration or to study better its relation with the structural background. With the analysis of the magnetic susceptibility of subsurface and the inversion profiles of the magnetic data (Euler deconvolution 2D) were interpolate a 3D model of the region, that allowed to generate a descriptive suggestion of the geometry of the Pari syncline, located in the Cuiabá Group, in the northwestern portion of the Paraguay belt. It has a strong structural control in the context of the Pari River basin and a great auriferous potential, as evidenced by updated research and exploration data. The data applied in this paper were extract from the Cuiabá aerogeophysical project and previous mappings and have their mean depths correlated with the Cuiabá group.
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43

Bento dos Santos, Telmo M., José M. Munhá, Colombo C. G. Tassinari, Paulo E. Fonseca, and Coriolano Dias Neto. "Thermochronology of central Ribeira Fold Belt, SE Brazil: Petrological and geochronological evidence for long-term high temperature maintenance during Western Gondwana amalgamation." Precambrian Research 180, no. 3-4 (July 2010): 285–98. http://dx.doi.org/10.1016/j.precamres.2010.05.002.

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44

Valentin, Eduardo, Nilson F. Botelho, and Elton L. Dantas. "Monte Santo suite, an example of Ediacaran-Cambrian deformed alkaline rocks in the Araguaia Belt, Central Brazil. Implications for Western Gondwana evolution." Lithos 366-367 (August 2020): 105552. http://dx.doi.org/10.1016/j.lithos.2020.105552.

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45

Hueck, Mathias, Miguel Angelo Stipp Basei, Klaus Wemmer, Sebastián Oriolo, Florian Heidelbach, and Siegfried Siegesmund. "Evolution of the Major Gercino Shear Zone in the Dom Feliciano Belt, South Brazil, and implications for the assembly of southwestern Gondwana." International Journal of Earth Sciences 108, no. 2 (November 10, 2018): 403–25. http://dx.doi.org/10.1007/s00531-018-1660-4.

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46

Steemans, Philippe, and Egberto Pereira. "Llandovery miospore biostratigraphy and stratigraphic evolution of the Paraná Basin, Paraguay – Palaeogeographic implications." Bulletin de la Société Géologique de France 173, no. 5 (September 1, 2002): 407–14. http://dx.doi.org/10.2113/173.5.407.

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Abstract The Paraná Basin covers 1,600,000 km2 including parts of southern Brazil, Paraguay, Uruguay and Argentina. It contains rocks ranging from the Ordovician to Tertiary in age. The present study is focused on the Itacurubí Group, of Llandovery age, from Paraguay. The sedimentology and palynology have been studied in three boreholes from the central part of Paraguay. The Itacurubí Group consists of the Euzébio Ayala, Vargas Peña and Cariy Formations. It corresponds to a complete transgressive – regressive cycle with maximum flooding in the Vargas Peña Formation. The sediments of the group were deposited in a glaciomarine regime and are included in the second order sequence. The palynofacies are dominated by acritarchs and chitinozoans, with miospores rare. Among the latter, cryptospores are most abundant and trilete spores very rare. The miospore assemblages are typical of the Llandovery. The presence of Laevolancis divellomedia and the successive first occurrence of the trilete spore genus Ambitisporites, followed by Archaeozonotriletes, allow the recognition of three biozones: divellomedia I, divellomedia II and chulusnanus. Correlations between the three boreholes based on miospore biostratigraphy and sequence stratigraphy techniques are similar. The miospore assemblages have important palaeogeographic implications: Ordovician / Silurian miospore assemblages, identified in South America are similar to those described in palaeogeographically distinct regions such as China, UK, Belgium, USA etc. This suggests that the phytogeographical differentiation proposed by Gray et al. [1992], with a Malvinokaffric Realm characterised by smooth tetrads and an extra-Malvinokaffric Realm characterised by ornamented tetrads, has to be reconsidered. Clearly, the same miospores are recovered from both regions, no matter if they are close to the palaeo-equator or the palaeo-pole, as is the case in Paraguay. These findings suggest that the same vegetation could survive under various climates. In theory, large oceans could be impassable geographic barriers for land plant miospores larger than 25 μm in diameter. As similar miospore assemblages occur, around the Ordovician – Silurian boundary, on the Gondwana, Avalonia and Laurentia plates, it seems likely that these palaeo-continental plates were in close proximity permitting the expansion of the vegetation through these continents. Therefore, palaeogeographic reconstructions with narrow oceans between the continents better explain early miospore biogeographies in early Silurian times. Maps produced by Dalziel et al. [1994] better explain the diachronism of trilete spore first appearances: Hirnantian in Turkey, Rhuddanian in Saudi Arabia, early Aeronian in Libya, late Aeronian in Paraguay, latest Aeronian in UK, and possibly Telychian in USA. The Baltica plate could possibly have been isolated by a geographic barrier during the Ashgill and the Llandovery, as only simple naked tetrads are known from that plate. The first appearance of the trilete spores in Götland during the early Wenlock could correspond to the end of this geographic isolation. This apparent isolation of the Baltica plate could be due to a lack of data.
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47

Faleiros, Frederico Meira, Ginaldo Ademar da Cruz Campanha, Lucelene Martins, Silvio Roberto Farias Vlach, and Paulo M. Vasconcelos. "Ediacaran high-pressure collision metamorphism and tectonics of the southern Ribeira Belt (SE Brazil): Evidence for terrane accretion and dispersion during Gondwana assembly." Precambrian Research 189, no. 3-4 (September 2011): 263–91. http://dx.doi.org/10.1016/j.precamres.2011.07.013.

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48

Heilbron, Monica, Claudio de Morisson Valeriano, Caroline Peixoto, Miguel Tupinambá, Franz Neubauer, Ivo Dussin, Felipe Corrales, et al. "Neoproterozoic magmatic arc systems of the central Ribeira belt, SE-Brazil, in the context of the West-Gondwana pre-collisional history: A review." Journal of South American Earth Sciences 103 (November 2020): 102710. http://dx.doi.org/10.1016/j.jsames.2020.102710.

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49

de Araujo Peixoto, Caroline, Monica Heilbron, Diana Ragatky, Richard Armstrong, Elton Dantas, Claudio de Morisson Valeriano, and Antonio Simonetti. "Tectonic evolution of the Juvenile Tonian Serra da Prata magmatic arc in the Ribeira belt, SE Brazil: Implications for early west Gondwana amalgamation." Precambrian Research 302 (November 2017): 221–54. http://dx.doi.org/10.1016/j.precamres.2017.09.017.

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50

C., FERNANDO FERNÁNDEZ. "Revision of the myrmicine ants of the Adelomyrmex genus-group (Hymenoptera: Formicidae)." Zootaxa 361, no. 1 (November 19, 2003): 1. http://dx.doi.org/10.11646/zootaxa.361.1.1.

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A revision of the myrmicinae ants of the Adelomyrmex genus-group is made. This group is recognized in workers and females by a combination of: antennae of 12 segments with club of 2 segments, median portion of clypeus forming a longitudinal platform and the lamelliform setae in the internal border of the mandibles. This last trait, unknown in other ants, is proposed as autapomorphy for the Adelomyrmex genus-group. The group contains two genera, Adelomyrmex Emery , 1897 (Neotropics, New Guinea, Fiji, Samoa) and Baracidris Bolton, 1981 (Africa), with 26 species (12 described as new) as follows: Adelomyrmex betoi Fernández sp.n. (México); A. biroi Emery, 1897 (New Guinea), A. boltoni Fernández sp.n. (Brazil and Paraguay); A. brevispinosus Fernández, 2003 (México and Costa Rica); A. costatus Fernández sp.n. (Colombia); A. cristiani Fernández sp.n. (Colombia); A. foveolatus Fernández, 2003 (Costa Rica); A. grandis Fernández sp.n. (Colombia); A. hirsutus Mann, 1921 (Fiji Islands); A. laevigatus MacKay, 2003 (Costa Rica); A. longinodus Fernández & Brandão sp.n. (Brazil); A. longinoi Fernández sp.n. (México and Costa Rica); A. mackayi Fernández sp.n. (México); A. micans Fernández, 2003 (México); A. microps Fernández, 2003 (Costa Rica); A. minimus Fernández, 2003 (Costa Rica); A. myops (Wheeler, 1910) (Guatemala to Colombia); A. robustus Fernández sp.n. (México); A. samoanus Wilson & Taylor, 1967 (Samoa); A. silvestrii (Menozzi, 1931) (Mesoamerica); A. striatus Fernández sp.n. (Brazil); A. tristani (Menozzi, 1931) (México to Colombia); A. vaderi Fernández sp.n. (Colombia); Baracidris meketra Bolton, 1981 (Nigeria), B. pilosa Fernández sp.n. (Kenya and Gabon); B. sitra Bolton, 1981 (Gabon). A key to workers of genera and all species is provided, with illustrations of most of them. The first queen for American Adelomyrmex and the first male of Adelomyrmex are described. The distribution of the group suggests an ancestor that lived in Gondwana before the splitting off of Africa and also suggests that ants could have originated earlier than the known fossil record.
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