Journal
RADIOCARBON
Volume 59, Issue 1, Pages 215-230Publisher
UNIV ARIZONA DEPT GEOSCIENCES
DOI: 10.1017/RDC.2017.6
Keywords
carbon and nitrogen isotopes; climate changes; Holocene; mangrove; palynology; sea level
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Funding
- FAPESP [03615-5/2007, 00995-7/11]
- CNPq [470210/2012-5, 405060/2013-0]
- National Institute on Science and Technology in Tropical Marine Environments INCT-AmbTropic (CNPq Process) [565054/2010-4]
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The aim of this paper is to evaluate the compatibility between the Holocene relative sea-level (RSL) curves proposed for the Brazilian littoral and mangrove dynamics along a fluvial valley in the state of southern Bahia. This was done integrating geomorphological, sedimentological, palynological, and stable isotopic data from two cores collected at the mouth of the Jucurucu River and at a site 23 km inland, near the city of Prado, northeastern Brazil. Core PR07, sampled from a fluvial plain at about 4.5 +/- 1 m above the RSL, reveals mangrove pollen (5-20%) and estuarine/terrestrial organic matter (delta C-13=similar to-25 parts per thousand, C/N=7.3-67) between 4.5 m (similar to 7400 cal yr BP) and 1.75 m depth (similar to 5350 cal yr BP). Core PR11, sampled from a mangrove tidal flat, also revealed mangrove pollen taxa (5-28%) since 660 cal yr BP. Core PR07 indicated absence of mangrove pollen and increase of sedimentary organic matter sourced from terrestrial C3 plants (delta C-13=similar to-27 parts per thousand, C/N=22-159) during the last 5350 cal yr BP. Probably, the changes in vegetation and sedimentary organic matter identified in core PR07 were caused by the combined effects of the RSL fluctuations, with a highstand at about 5350 cal yr BP of 2.7 +/- 1.35 m, and changes in fluvial discharge.
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