Closing the Clymene ocean and bending a Brasiliano belt: Evidence for the Cambrian formation of Gondwana, southeast Amazon craton

Tohver, Eric; Trindade, R. I.; Solum, John; Hall, Chris M.; Riccomini, Cláudio; Nogueira, Afonso César Rodrigues

doi:10.1130/g30510.1

Cited by 116 publications

(71 citation statements)

References 21 publications

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“…σ 1 , is compatible with the last deformational events in the Paraguay Belt (Pimentel et al 1996, Tohver et al 2010, south of the Amazon Craton, and also with the final collision between eastern and western Gondwana around 530 Ma (Meert 2001). Most of the post-collisional ductile strike-slip deformation that affects rocks of deeper crustal levels in the same region -the Southern Mantiqueira Province -may be related to the intense brittle strikeslip deformation of the basins due to these two compressional events at shallower crustal levels.…”

Section: Extension After Neoproterozoic Collisionmentioning

confidence: 57%

Recurring extensional and strike-slip tectonics after the Neoproterozoic collisional events in the southern Mantiqueira province

Almeida

Santos

Fragoso-Cesar

et al. 2012

An. Acad. Bras. Ciênc.

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In Eastern South America, a series of fault-bounded sedimentary basins that crop out from Southern Uruguay to Southeastern Brazil were formed after the main collisional deformation of the Brasiliano Orogeny and record the tectonic events that affected the region from the Middle Ediacaran onwards.We address the problem of discerning the basin-forming tectonics from the later deformational events through paleostress analysis of more than 600 fault-slip data, mainly from the Camaquã Basin (Southern Brazil), sorted by stratigraphic level and cross-cutting relationships of superposed striations, and integrated with available stratigraphic and geochronological data. Our results show that the Camaquã Basin was formed by at least two distinct extensional events, and that rapid paleostress changes took place in the region a few tens of million years after the major collision (c.a. 630 Ma), probably due to the interplay between local active extensional tectonics and the distal effects of the continued amalgamation of plates and terranes at the margins of the still-forming Gondwana Plate. Preliminary paleostress data from the Castro Basin and published data from the Itajaí Basin suggest that these events had a regional nature.

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Section: Extension After Neoproterozoic Collisionmentioning

confidence: 57%

Recurring extensional and strike-slip tectonics after the Neoproterozoic collisional events in the southern Mantiqueira province

Almeida

Santos

Fragoso-Cesar

et al. 2012

An. Acad. Bras. Ciênc.

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“…The incipient stage of deformation in the form of early thrusting was inferred to be associated with clay mineral transformations and chemical remagnetization of carbonates in the Araras Group at ca. 528 Ma (Tohver et al, 2010). In this contribution, Tohver et al (2010) showed that oroclinal bending of the Paraguay Belt was caused by a 90° clockwise rotation of the east-limb sometime after 528 Ma.…”

Section: Tectonic Model and The Paraguay Belt Within South America Anmentioning

confidence: 92%

Age and provenance of the Cryogenian to Cambrian passive margin to foreland basin sequence of the northern Paraguay Belt, Brazil

McGee

Collins

Trindade

et al. 2014

Geological Society of America Bulletin

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The Paraguay Belt in central South America developed in response to the collision of the Amazonian craton, the São Francisco craton, and the Paranapanema block. The alleged "Brasiliano" age (ca. 620 Ma) of orogenesis has recently been questioned by paleo magnetic and radioisotopic ages that indicate the closing stages of orogenesis occurred well into the Cambrian. We investigated the timing of deposition and source areas for these sedimentary rocks overlying the Amazonian craton using integrated U-Pb and Hf isotope data of detrital zircons from within this sequence. In total, 742 detrital zircon U-Pb ages were analyzed from samples taken from the base to the top of this sedimentary succession. Maximum depositional ages from the uppermost part of this sequence of rocks, the Diamantino Formation, indicate that fi nal deposition began no earlier than 560 ± 13 Ma and possibly as young as the Cambrian. Given that zircon inheritance in these rocks continues up until this age and that known Amazonian craton ages are older than ca. 950 Ma, we considered other potential sources for these sediments. This was achieved by integrating the U-Pb detrital zircon data with Hf isotopic data from these zircons that have ε Hf values ranging from -18 to 12. The ε Hf signature is consistent, with a predominantly Amazonian source until the early Neoproterozoic, at which point the signal becomes signifi cantly more evolved. These data, when combined with other evidence discussed here, are consistent with an ocean to the east of the present-day Amazonian craton that did not close until the latest Ediacaran-Cambrian.

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“…New evidence supporting this interpretation came from paleomagnetic and geochronological studies from remagnetized carbonate rocks collected along the Paraguay Belt (Tohver et al 2010). Collision along the southeastern margin of the Amazonian Craton along the Paraguay Belt produced folding, trusting, and remagnetization dated at 528 ± 36 Ma.…”

Section: The Amazonian Craton In Gondwanamentioning

confidence: 97%

“…Collision along the southeastern margin of the Amazonian Craton along the Paraguay Belt produced folding, trusting, and remagnetization dated at 528 ± 36 Ma. According to Tohver et al (2010), the oroclinal inflection of the Paraguay Belt occurred after 528 Ma, which caused the coherent change observed in the ChRM declinations disclosed for rocks collected in the northern and southern inflection areas. carried out a review regarding the geological, geochronological and tectonic history related to Araguaia, Paraguay and Pampeano belts.…”

Section: The Amazonian Craton In Gondwanamentioning

confidence: 99%

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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Closing the Clymene ocean and bending a Brasiliano belt: Evidence for the Cambrian formation of Gondwana, southeast Amazon craton

Cited by 116 publications

References 21 publications

Recurring extensional and strike-slip tectonics after the Neoproterozoic collisional events in the southern Mantiqueira province

Recurring extensional and strike-slip tectonics after the Neoproterozoic collisional events in the southern Mantiqueira province

Age and provenance of the Cryogenian to Cambrian passive margin to foreland basin sequence of the northern Paraguay Belt, Brazil

Paleomagnetism of the Amazonian Craton and its role in paleocontinents

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