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Late Cenozoic sedimentary sequences in Acre state, southwestern Amazonia: Fluvial or tidal? Deductions from the IGCP 449 fieldtrip

Lookup NU author(s): Dr Rob Westaway

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Abstract

The IGCP 449 fieldtrip in June 2003 drew attention to the Late Cenozoic fluvial sequences of western Amazonia. In Acre state in western Brazil, underlain by relatively mobile crust, rivers have incised up to 70 minto the stacked latest Miocene (?)/Early Pliocene (?) sediments of the Solimoes Group, creating staircases of fluvial terraces and indicating regional uplift on this time scale. In contrast, in western Rondonia state, the Madeira River flows through the Early Proterozoic western part of the Amazon Craton, where Late Cenozoic vertical crustal motions seem minimal. The evidence in Acre suggests that the Solimoes Group was deposited by an ancestral river system associated with the incipient development of the modem eastward Amazon drainage. (c) 2005 Elsevier Ltd. All rights reserved.

Publication metadata

Author(s): Westaway R

Publication type: Article

Publication status: Published

Journal: Journal of South American Earth Sciences

Year: 2006

Volume: 21

Issue: 1-2

Pages: 120-134

ISSN (print): 0895-9811

ISSN (electronic): 1873-0647

Publisher: Pergamon

URL: http://dx.doi.org/10.1016/j.jsames.2005.08.004

DOI: 10.1016/j.jsames.2005.08.004

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