Pleistocene-Holocene sedimentation of Solimões-Amazon fluvial system between the tributaries Negro and Madeira, Central Amazon

ABSTRACT: In the scope of Solimões-Amazon fluvial system between the Negro and Madeira tributaries, three levels of Quaternary fluvial terraces overlie the Alter do Chão and Novo Remanso formations further than 100 km southward its current main channel. Smooth undulated topography presenting low d... Ausführliche Beschreibung

1. Person: Eliezer Senna Gonçalves Júnior verfasserin
Weitere Personen: Emílio Alberto Amaral Soares verfasserin; Sonia Hatsue Tatumi verfasserin; Marcio Yee verfasserin; Juan Carlos Ramirez Mittani verfasserin
Quelle: In Brazilian Journal of Geology
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  Creative Commons License Source: Directory of Open Access Journals (DOAJ).
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024 7 |a 10.1590/2317-4889201620160009  |2 doi 
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100 0 |a Eliezer Senna Gonçalves Júnior  |e verfasserin  |4 aut 
245 1 0 |a Pleistocene-Holocene sedimentation of Solimões-Amazon fluvial system between the tributaries Negro and Madeira, Central Amazon  |h Elektronische Ressource 
300 |a Online-Ressource 
520 |a ABSTRACT: In the scope of Solimões-Amazon fluvial system between the Negro and Madeira tributaries, three levels of Quaternary fluvial terraces overlie the Alter do Chão and Novo Remanso formations further than 100 km southward its current main channel. Smooth undulated topography presenting low drainages density formed by sparse secondary plain channels and rounded lakes characterizes these deposits. Internally, they show point bars morphology constituted by intercalated layers of mud (silt and clay) and sand forming an inclined heterolithic stratification. The asymmetric distribution of fluvial terraces allied to the records of old scroll-bars features and paleochannels in many extensions of the Solimões River suggests the predominance of a meander pattern between 240 to 6 kyears. On the other hand, the development of the current anabranching pattern took place in the last six kyears due to the Holocene sea-level rise, besides the action of neotectonics and rainforest establishment related to the increase of humidity in Amazonia. 
700 0 |a Emílio Alberto Amaral Soares  |e verfasserin  |4 aut 
700 0 |a Sonia Hatsue Tatumi  |e verfasserin  |4 aut 
700 0 |a Marcio Yee  |e verfasserin  |4 aut 
700 0 |a Juan Carlos Ramirez Mittani  |e verfasserin  |4 aut 
773 0 8 |i In  |t Brazilian Journal of Geology  |w (DE-601)DOAJ00001981X  |x 2317-4889 
856 4 0 |u http://dx.doi.org/10.1590/2317-4889201620160009 
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856 4 0 |u https://doaj.org/toc/2317-4692 
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