The Xingu River is a large clearwater river in eastern Amazonia and its downstream sector, known as the Volta Grande do Xingu (“Xingu Great Bend”), is a unique fluvial landscape that plays an important role in the biodiversity, biogeochemistry and prehistoric and historic peopling of Amazonia. The sedimentary dynamics of the Xingu River in the Volta Grande and its downstream sector will be shifted in the next few years due to the construction of dams associated with the Belo Monte hydropower project. Impacts on river biodiversity and carbon cycling are anticipated, especially due to likely changes in sedimentation and riverbed characteristics. This research project aims to define the geological and climate factors responsible for the development of the Volta Grande landscape and to track its environmental changes during the Holocene, using the modern system as a reference. In this context, sediment cores, riverbed rock and sediment samples and greenhouse gas (GHG) samples were collected in the Volta Grande do Xingu and adjacent upstream and downstream sectors. The reconstruction of past conditions in the Volta Grande is necessary for forecasting future scenarios and defining biodiversity conservation strategies under the operation of Belo Monte dams. This paper describes the scientific questions of the project and the sampling surveys performed by an international team of Earth scientists and biologists during the dry seasons of 2013 and 2014. Preliminary results are presented and a future workshop is planned to integrate results, present data to the scientific community and discuss possibilities for deeper drilling in the Xingu ria to extend the sedimentary record of the Volta Grande do Xingu.

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Published in Scientific Drilling, v. 20, p. 21-32.

© Author(s) 2015.

This work is distributed under the Creative Commons Attribution 3.0 License.

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A. O. Sawakuchi thanks the FAPESP (grant no. 2011/06609- 1). G. A. Hartmann thanks CAPES (grant AUXPE 2043/2014) and CNPq (grant 454609/2014-0). F. N. Pupim thanks FAPESP (grant no. 2014/23334-4). C. H. Grohmann is a research fellow of CNPq (306294/2012-5) and is co-funded by a collaborative Dimensions of Biodiversity BIOTA grant supported by grant no. 2012/50260-6, São Paulo Research Foundation (FAPESP), the National Science Foundation (NSF DEB-1241066), and the National Aeronautics and Space Administration (NASA). M. Sabaj Pérez and fieldwork were supported in part by the iXingu project, NSF DEB-1257813. J. F. Savian thanks CNPq (grant 457802/2014-6) and FAPERGS (grant 2329-2551/14-1).