Neogene–Quaternary sedimentary and paleovegetation history of the eastern Solimões Basin, central Amazon region

Nogueira, Afonso César Rodrigues; Silveira, Rosemery Rocha da; Guimarães, José Tasso Felix

doi:10.1016/j.jsames.2013.05.004

Cited by 77 publications

(62 citation statements)

References 30 publications

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“…The presence of reworked older Cenozoic, Cretaceous and Paleozoic Andean palinomorphs, and the eastward paleocurrents direction of the Solimões Formation (Nogueira et al 2013) points out the drainage to have come from the West, conversely to Alter do Chão and Repouso formations drainage coming from the East.…”

Section: Discussionmentioning

confidence: 98%

“…), identified by , which could have been reworked Repouso Formation material from the uplifted Amazon drainage system headwaters in the Andes and its foreland region. Nogueira et al (2013) later reinterpreted the same Coari outcrops as having been deposited in a lacustrine environment associated to meandering rivers, with no marine influence, and concluded the lower sequence to correspond to Late Miocene-Pliocene-aged Solimões Formation and the upper one to Pleistocene-aged Içá Formation. Both sequences indicate eastward directed paleocurrents.…”

Section: Discussionmentioning

confidence: 99%

“…There is a general idea asserting the Purus Arch would have been a topographic barrier separating the drainage between Solimões and Amazon basins, prior to the formation of the modern Amazon River (Potter 1997, Figueiredo et al 2009, Nogueira et al 2013, Rossetti et al 2015. Nevertheless, no evidence was found to support this idea, since on the Purus Arch area and westernmost portion of the Amazon Basin, Solimões Formations strata occur, containing Andesoriginated palynomorphs and minerals (Cunha et al 2007, Motta 2008, indicating there have been no obstruction of the eastward drainage from the Solimões Basin to the Atlantic Ocean throughout the Negro, Amazon and other river deep valleys.…”

Section: Purus Arch and Amazon Basinmentioning

confidence: 99%

“…Following the drainage reorganization at the beginning of Late Miocene, the Late Miocene-Early Pliocene-aged Solimões Formation (Cruz, Zone B, 1984, Silva 2004, Latrubesse et al 2007, 2010 and others) represents the Amazon River sedimentation towards the Atlantic Ocean, when the sea level rose again, since it exhibits Andean palynomorphs (Nogueira et al 2013, Motta 2008) and minerals (Mapes 2009), in the east of the Purus Arch, as well.…”

Section: Solimões and Acre Basinsmentioning

confidence: 99%

“…However, the lack of Andean-sourced palinomorphs and minerals in the Middle Miocene Alter do Chão Formation led to concluding incorrectly the Purus Arch would have functioned as a geographical barrier, preventing deposition of any material coming from the Andes, up to the Pliocene , Dino et al 2012, Nogueira et al 2013. In Solimões Basin, Repouso Formation sandstone zircons, from the well 31MT-0003-AM, located in the town of Tefé (Amazonas State), dated by Russel W. Mapes, indicated U-Pb Archean ages.…”

Section: Amazon Rivermentioning

confidence: 99%

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Eustatic and tectonic change effects in the reversion of the transcontinental Amazon River drainage system

Caputo

Soares

2016

Braz. J. Geol.

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The development of the transcontinental Amazon River System involved geological events in the Andes Chain; Vaupés, Purus and Gurupá arches; sedimentary basins of the region and sea level changes. The origin and age of this river have been discussed for decades, and many ideas have been proposed, including those pertaining to it having originated in the Holocene, Pleistocene, Pliocene, Late Miocene, or even earlier times. Under this context, the geology of the sedimentary basins of northern Brazil has been analyzed from the Mesozoic time on, and some clarifications are placed on its stratigraphy. Vaupés Arch, in Colombia, was uplifted together with the Andean Mountains in the Middle Miocene time. In the Cenozoic Era, the Purus Arch has not blocked this drainage system westward to marine basins of Western South America or eastward to the Atlantic Ocean. Also the Gurupá Arch remained high up to the end of Middle Miocene, directing this drainage system westward. With the late subsidence and breaching of the Gurupá Arch and a major fall in sea level, at the beginning of the Late Miocene, the Amazon River quickly opened its pathway to the west, from the Marajó Basin, through deep headward erosion, capturing a vast drainage network from cratonic and Andean areas, which had previously been diverted towards the Caribbean Sea. During this time, the large siliciclastic influx to the Amazon Mouth (Foz do Amazonas) Basin and its fan increased, due to erosion of large tracts of South America, linking the Amazon drainage network to that of the Marajó Basin. This extensive exposure originated the Late Miocene (Tortonian) unconformity, which marks the onset of the transcontinental Amazon River flowing into the Atlantic Ocean.

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%