The Rondonian-San Ignacio Province in the SW Amazonian Craton: An overview

Bettencourt, Jorge Silva; Leite, Washington Barbosa; Ruiz, Amarildo Salina; Matos, Renato Camargo; Payolla, B. L.; Tosdal, Richard M.

doi:10.1016/j.jsames.2009.08.006

Cited by 145 publications

(174 citation statements)

References 36 publications

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“…2A), which is adopted by several other authors (e.g. Schobbenhaus et al 2004, Cordani & Teixeira 2007, Cordani et al 2010, Bettencourt et al 2010. The oldest portion (Hadean-Archean) of the Amazonian Craton (Central Amazonian Province) consists of granite-greenstone terrains and high-grade metamorphic rocks exposed in the Brazil-Central and Guiana shields (Tassinari & Macambira 2004, Nadeau et al 2013.…”

Section: The Amazonian Cratonmentioning

confidence: 99%

“…Jauru Terrain in Mato Grosso State), forming the Rondoniano-San-Ignacio Province until the final collision of Paraguá Terrain at about 1320 Ma ago (Bettencourt et al 2010). This collisional model has been extended to the northwestern Rondônia State, with the recognition of the Trincheira ophiolite by Rizzotto & Hartmann (2012), who interpreted it as an oceanic crust fragment raised during the Mesoproterozoic as a consequence of the collision between the Paraguá Terrain and the proto-Amazonian Craton along the Alto Guaporé Belt (Fig.…”

Section: The Amazonian Cratonmentioning

confidence: 99%

“…A positive baked contact test obtained for one of the dykes that cut the Paleoproterozoic Matupá granite demonstrates the primary nature of the characteristic remanent magnetization (ChRM) isolated for these rocks (see Bispo-Santos et al 2012). The Indiavaí Intrusive belongs to a set of mafic bodies collectively known as Figueira Branca Intrusive Suite (Bettencourt et al 2010). U-Pb dating performed on zircons extracted from Indiavaí and Figueira Branca Intrusives provided ages of 1425 ± 8 Ma and 1415 ± 6 Ma, respectively, which were interpreted as the crystallization times of these bodies .…”

Section: Columbia Supercontinentmentioning

confidence: 99%

“…Colíder pole was obtained for 1780-1790 Ma felsic rocks from the southern part of Amazonian Craton, where NW-SE magmatic arcs were being formed along the Jauru Terrain up to the final collision of Paraguá Terrain at 1320 Ma (Bettencourt et al 2010). This makes easier to assume that the Colíder pole represents a secondary magnetization; 4. the presently available 1530 Ma paleomagnetic data for Amazonia, Baltica and Laurentia are also consistent with the SAMBA model (Pesonen et al 2012).…”

Section: Columbia Supercontinentmentioning

confidence: 99%

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Paleomagnetism of the Amazonian Craton and its role in paleocontinents

et al. 2016

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In the last decade, the participation of the Amazonian Craton on Precambrian supercontinents has been clarified thanks to a wealth of new paleomagnetic data. Paleo to Mesoproterozoic paleomagnetic data favored that the Amazonian Craton joined the Columbia supercontinent at 1780 Ma ago, in a scenario that resembled the South AMerica and BAltica (SAMBA) configuration. Then, the mismatch of paleomagnetic poles within the Craton implied that either dextral transcurrent movements occurred between Guiana and Brazil-Central Shield after 1400 Ma or internal rotation movements of the Amazonia-West African block took place between 1780 and 1400 Ma. The presently available late-Mesoproterozoic paleomagnetic data are compatible with two different scenarios for the Amazonian Craton in the Rodinia supercontinent. The first one involves an oblique collision of the Amazonian Craton with Laurentia at 1200 Ma ago, starting at the present-day Texas location, followed by transcurrent movements, until the final collision of the Amazonian Craton with Baltica at ca. 1000 Ma. The second one requires drifting of the Amazonian Craton and Baltica away from the other components of Columbia after 1260 Ma, followed by clockwise rotation and collision of these blocks with Laurentia along Grenvillian Belt at 1000 Ma. Finally, although the time Amazonian Craton collided with the Central African block is yet very disputed, the few late Neoproterozoic/Cambrian paleomagnetic poles available for the Amazonian Craton, Laurentia and other West Gondwana blocks suggest that the Clymene Ocean separating these blocks has only closed at late Ediacaran to Cambrian times, after the Amazonian Craton rifted apart from Laurentia at ca. 570 Ma.

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Section: The Amazonian Cratonmentioning

confidence: 99%

Section: The Amazonian Cratonmentioning

confidence: 99%

Section: Columbia Supercontinentmentioning

confidence: 99%

Section: Columbia Supercontinentmentioning

confidence: 99%

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Paleomagnetism of the Amazonian Craton and its role in paleocontinents

et al. 2016

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“…The first one describes this Terrane as an allochthonous crustal fragment geographically separated from the Amazon Craton by the Tucavaca Belt (Barros et al 1982, Del'Arco et al 1982, Litherland et al 1986, Alvarenga & Saes 1992, Brito Neves et al 1995, Trompette et al 1998, Tassinari & Macambira 1999, 2004, Santos et al 2000, Bettencourt et al 2010. The second proposal, by Ruiz et al (2005), Lacerda Filho et al (2006) and Cordani et al (2010), takes into consideration the previous proposal of Almeida (1967) and Amaral (1974), in which the Rio Apa Terrane is described as a prolongation of the Amazon Craton and the basement of Neoproterozoic mobile belts.…”

Section: Regional Geologic Settingmentioning

confidence: 99%

Petrogenesis and U-Pb and Sm-Nd geochronology of the Taquaral granite: record of an orosirian continental magmatic arc in the region of Corumba - MS

et al. 2015

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ABSTRACT:The Taquaral Granite is located on southern Amazon Craton in the region of Corumbá, westernmost part of the Brazilian state of Mato Grosso do Sul (MS), near Brazil-Bolivia frontier. This intrusion of batholitic dimensions is partially covered by sedimentary rocks of the Urucum, Tamengo Bocaina and Pantanal formations and Alluvial Deposits. The rock types are classified as quartz-monzodiorites, granodiorites, quartz-monzonites, monzo and syenogranites. There are two groups of enclaves genetically and compositionally different: one corresponds to mafic xenoliths and the second is identified as felsic microgranular enclave. Two deformation phases are observed: one ductile (F 1 ) and the other brittle (F 2 ). Geochemical data indicate intermediate to acidic composition for these rocks and a medium to high-K, metaluminous to peraluminous calk-alkaline magmatism, suggesting also their emplacement into magmatic arc settings. SHRIMP zircon U-Pb geochronological data of these granites reveals a crystallization age of 1861 ± 5.3 Ma. Whole rock Sm-Nd analyses provided ε Nd(1,86 Ga) values of -1.48 and -1.28 and T DM model ages of 2.32 and 2.25 Ga, likely indicating a Ryacian crustal source. Here we conclude that Taquaral Granite represents a magmatic episode generated at the end of the Orosirian, as a part of the Amoguija Magmatic Arc.

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