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 Jucuruçu 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 (δ13C=~–25‰, C/N=7.3–67) between 4.5 m (~7400 cal yr BP) and 1.75 m depth (~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 (δ13C=~–27‰, 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.
Generally, palaeoenvironmental interpretations consider only allogenic processes, when autogenic factors may have a strong influence on proxies of stratigraphic sequences. For instance, the Holocene history of the vegetation along the southern littoral of the State of Bahia in north-eastern Brazil is characterized by mangrove dynamics controlled by allogenic processes. However, over smaller timescales (~700 years), autogenic processes may have controlled vegetation dynamics and hence observed pollen distribution. This work proposes tidal channel dynamics as one of the main cause for changes in pollen assemblage along the studied stratigraphic profiles during the last centuries, based on sedimentology, pollen and elemental analysis (δ 13 C, δ 15 N and C/N) and radiocarbon dating of sedimentary organic matter from two cores sampled from an abandoned meander and a tidal flat at the mouth of the Jucuruçu River. One core was sampled from a mangrove formed during the past~550 cal yr BP. Another core recorded sediments in a várzea forest (swamp seasonally and permanently inundated by freshwater) located~2.7 km from the current shoreline, which displayed a maximum age of~680 cal yr BP. Two facies associations were identified: tidal channel (A) and tidal flat/oxbow lake (B). This work proposes allogenic processes as the main driving forces controlling the wetlands dynamics at the studied site during the Holocene. However, our data also reveal that part of the changes in vegetation over the last~700 years reflect tidal channels and tidal flats development, which represent autogenic processes. The change in timescale analysis from the Holocene to recent centuries may have weakened the influence of allogenic factors. However, this needs interpretation with reference to the spatial scale of the depositional environment as the larger the depositional system analyzed, the stronger the influence of autogenic processes on stratigraphic sequences over longer timescales.
2.1 INTRODUCTION 2.2 STUDY AREA 2.2.1 GEOLOGY AND TOPOGRAPHY 2.2.2 CLIMATE v 2.2.3 VEGETATION 2.2.4 LAND USE 2.3 MATERIAL AND METHODS 2.3.1 CORING, RADIOCARBON DATING AND AGE-DEPTH-MODELING 2.3.2 PALYNOLOGICAL ANALYSIS 2.3.3 MICRO-CHARCOAL ANALYSIS 2.3.4 DATA ANALYSIS 2.4 RESULTS 2.4.1 DESCRIPTION OF SEDIMENTS IN THE CORE 2.4.2 RADIOCARBON DATING AND SEDIMENTATION RATES 2.4.3 PALYNOLOGICAL AND CHARCOAL RESULTS 2.4.3.2. POLLEN ZONE P-II (285-132,5 CM; 19 SAMPLES; 2,150-450 CAL YR BP) 2.4.3.3. POLLEN ZONE P-III (132.5-70 CM; 13 SAMPLES; 450-150 CAL YR BP) 2.4.4 PRINCIPAL COMPONENT ANALYSIS (PCA) 2.5 ENVIRONMENTAL RECONSTRUCTION AND DISCUSSION 2.5.1 LATE HOLOCENE BETWEEN 2800 -2150 CAL YR BP (POLLEN ZONE P-I) 2.5.2 LATE HOLOCENE BETWEEN 2150-450 CAL YR BP (POLLEN ZONE P-II) 2.5.3 LATE HOLOCENE BETWEEN 450-150 CAL YR BP (POLLEN ZONE P-III) 2.6 SUMMARY AND CONCLUSION CHAPTER 3 3.1 INTRODUCTION 3.2 STUDY AREA 3.2.1 LOCATION AND GEOLOGICAL CHARACTERISTICS 3.2.2 CLIMATE 3.2.3 MODERN VEGETATION vi 3.2.4 HUMAN IMPACT
MATERIAL AND METHODS
RADIOCARBONDATING AND AGE-DEPTH MODEL 3.3.2 QUALITATIVE CHEMICAL ANALYSIS BY XRF-SCANNING AND LOI EVALUATION 3.3.3 MINERALOGICAL CHARACTERIZATION BY XRPD 3.3.4 PALYNOLOGICAL AND MACRO-CHARCOAL ANALYSIS 3.3.5 DATA ANALYSIS 3.4 RESULTS 3.4.1 SEDIMENTOLOGICAL DESCRIPTION OF THE CORE 3.4.2 CHEMICAL COMPOSITION AND LOI 3.4.3 MINERALOGICAL COMPOSITION 3.4.4 DESCRIPTION OF POLLEN, SPORE, AND CHARCOAL DATA 3.4.5 PRINCIPAL COMPONENT ANALYSIS (PCA) 3.5 INTERPRETATION AND DISCUSSION 3.5.1 MID-HOLOCENE PERIOD FROM 7520-6230 CAL YR BP (POLLEN ZONE LF-I) 3.5.2 MID-HOLOCENE PERIOD FROM 6230-5020 CAL YR BP (POLLEN ZONE LF-II) 3.5.3 MID-TO LATE HOLOCENE PERIOD FROM 5020-2580 CAL YR BP (POLLEN ZONE LF-IIIA) 3.5.4 LATE HOLOCENE PERIOD FROM 2580-1350 CAL YR BP (POLLEN ZONE LF-IIIB) 3.5.5 LATE HOLOCENE PERIOD FROM 1350 CAL YR BP -PRESENT (POLLEN ZONE LF-IIIC) 3.6 SUMMARY AND CONCLUSION CHAPTER 4 4.1 INTRODUCTION 4.2 REGIONAL SETTING 4.2.1 LOCATION AND GEOMORPHOLOGICAL CHARACTERISTICS 4.2.2 CLIMATE vii 4.2.3 MODERN VEGETATION 4.2.4 ARCHAEOLOGICAL AND SETTLEMENT HISTORY 4.3 MATERIAL AND METHODS 4.3.1 RADIOCARBON DATING AND AGE-DEPTH MODEL 4.3.2 MINERALOGICAL ANALYSIS BY X-RAY POWDER DIFFRACTION 4.3.3 MICROMORPHOLOGICAL AND SPOT CHEMICAL ANALYZES BY SCANNING ELECTRON MICROSCOPE (SEM) 4.3.4 WHOLE ROCK CHEMICAL ANALYSIS 4.3.5 PALYNOLOGY 4.3.6 MACRO-CHARCOAL ANALYSIS 4.3.7 GEOLOGICAL AND VEGETATIONAL MAPS AND DATA ANALYSIS 4.4 RESULTS 4.4.1 SEDIMENTOLOGICAL DESCRIPTION OF THE CORE 4.4.2 RADIOCARBON DATING AND SEDIMENTATION RATES 4.4.3 MINERALOGICAL COMPOSITION 4.5 CHEMICAL COMPOSITION 4.5.1 PALYNOLOGICAL AND CHARCOAL DESCRIPTION 4.5.2 PRINCIPAL COMPONENT ANALYSIS (PCA) 4.6 DISCUSSION 4.6.1 MID-HOLOCENE PERIOD FROM 7915 TO 7500 CAL YR BP (POLLEN ZONE C-I) 4.6.2 MID-TO LATE HOLOCENE PERIOD FROM 7500 TO 1800 CAL YR BP (POLLEN ZONE C-IIA) 4.6.3 LATE HOLOCENE PERIOD FROM 1800 TO PRESENT (POLLEN ZONE C-IIB) 4.7 SUMMARY AND CONCLUSION ACKNOWLEDGEMENTS CHAPTER 5 SYNTHESIS viii 5.1 SEA-LEVEL OSCILLATIONS AND MANGROVES DYNAMI...
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