Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5163107 | Organic Geochemistry | 2013 | 8 Pages |
Abstract
A multi-proxy study has been performed on a sediment core from the Curuai floodplain, Central Amazonia. The combination of elemental, isotopic and molecular analysis of a 110Â cm core (a record of ca. the last 100Â yr) allowed reconstruction of the hydrological conditions of organic matter (OM) deposition. Two units could be delineated. The first (UI) was composed of three sub-units: UIa (0-15Â cm), composed of highly degraded organic particles originating from the surrounding soil and indicative of restricted transport; UIb (15-48Â cm), during which the region was permanently flooded and the material stored came from soil runoff, mainly from alluvial forest; and UIc (48-88Â cm) composed of material from Amazon River suspended sediment, itself originating from OM degradation in forest soil. In UII (88-111Â cm), the OM originated mainly from the forest soil and other plant remains in the floodplain. The data reveal that, during the four distinct depositional periods, the sedimentary OM alternated between land derived soil and alluvial vegetation due to changes in hydrodynamics.
Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
R. Zocatelli, P. Moreira-Turcq, M. Bernardes, B. Turcq, R.C. Cordeiro, S. Gogo, J.R. Disnar, M. Boussafir,