Inorganic Geochemical Methods in Palaeolimnology

Boyle, John

doi:10.1007/0-306-47670-3_5

Cited by 150 publications

(139 citation statements)

References 180 publications

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“…Below 25 cm (i.e., prior to the mid-1960s) the sediment is rich in Si and Zr and relatively depleted in the other major and minor elements. The correlation of Zr with Si (R ¼ 0.66) is typical where a silt component mixes with other sediment components (Boyle 2001). The fall in both Si and Zr above 25 cm, and complementary increase in Ti and K is compatible with an increase in the clay concentration, a conclusion which is supported by particle size analysis in an adjacent core which shows an increased clay content in the top 25-30 cm.…”

Section: Sediment Geochemistrymentioning

confidence: 64%

“…A passive tracer element can be used to evaluate this (Norton and Kahl 1987;Boyle 2001) whilst the method employed by Hilton et al (1985) can be used to decide upon an appropriate model. The essence of the approach is to identify a depth in the sediment above which contamination by pollutants disrupts the previous relationship between a heavy metal and a passive tracer element.…”

Section: Discussionmentioning

confidence: 99%

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Sedimentary evidence for changes in the pollution status of Taihu in the Jiangsu region of eastern China

Rose

Boyle

et al. 2004

Journal of Paleolimnology

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As part of a study using lake sediments to determine the extent and causes of human impacts to lakes along an east-west transect following the Yangtse River, sediment cores were taken from Taihu in eastern China. Previous studies have focussed on the impacts of direct inputs of pollutants from municipal and industrial wastewater but little work has been undertaken on trends in atmospheric deposition from the many industrial sources surrounding the lake. Analysis of the Taihu sediment cores for atmospheric pollutant indicators such as trace metals, magnetic parameters and spheroidal carbonaceous particles (SCPs) show the lake has become increasingly contaminated over the last 40-50 years. Sediment levels of atmospherically deposited pollutants are currently similar to some of the more contaminated lakes in Europe. Further, sediment nitrogen, phosphorus and geochemical analyses confirm the dramatic increase in eutrophication at the site and periods of recent soil erosion in the catchment.

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Section: Sediment Geochemistrymentioning

confidence: 64%

Section: Discussionmentioning

confidence: 99%

Sedimentary evidence for changes in the pollution status of Taihu in the Jiangsu region of eastern China

Rose

Boyle

et al. 2004

Journal of Paleolimnology

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“…The seasonal changes in river discharge controls the relative concentrations of lithophilic elements (Ti, Al, K) compared to elements influenced by redox conditions in the water column and riverbed (P, Fe, Mn). While the uncertainty of organic carbon sources and its stability through time limits its use as proxy for lake productivity or paleo-redox conditions, phosphorous concentration is a useful indicator of paleo-productivity (Engstrom and Wright, 1984;Dean and Gorham, 1998;Boyle, 2001). In order to compensate for fluctuations in allochthonous (terrigenous) inputs of sediments to the ria lake, the P to Ti ratio was chosen as productivity indicator (Latimer and Filippelli, 2002;Filippelli et al, 2003).…”

Section: Discussionmentioning

confidence: 99%

The Fate of Carbon in Sediments of the Xingu and Tapajós Clearwater Rivers, Eastern Amazon

Bertassoli

Sawakuchi

et al. 2017

Front. Mar. Sci.

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The Xingu and Tapajós rivers in the eastern Amazon are the largest clearwater systems of the Amazon basin. Both rivers have "fluvial rias" (i.e., lake-like channels) in their downstream reaches as they are naturally impounded by the Amazon mainstem. Fluvial rias are widespread in the Amazon landscape and most of the sedimentary load from the major clearwater and blackwater rivers is deposited in these channels. So far, little is known about the role of Amazon rias as a trap and reactor for organic sediments. In this study, we used organic and inorganic geochemistry, magnetic susceptibility, diatom, and pollen analyses in sediments (suspended, riverbed, and downcore) of the Xingu and Tapajós rias to investigate the effects of hydrologic variations on the carbon budget in these clearwater rivers over the Holocene. Ages of sediment deposition (∼100 to 5,500 years) were constrained by optically stimulated luminescence and radiocarbon. Major elements geochemistry and concentration of total organic carbon (TOC) indicate that seasonal hydrologic variations exert a strong influence on riverine productivity and on the input and preservation of organic matter in sediments. Stable carbon isotope data (δ 13 C from −31.04 to −27.49‰) and pollen analysis indicate that most of the carbon buried in rias is derived from forests. In the Xingu River, diatom analysis in bottom sediments revealed 65 infrageneric taxa that are mostly well-adapted to slack oligotrophic and acidic waters. TOC values in sediment cores are similar to values measured in riverbed sediments and indicate suitable conditions for organic matter preservation in sediments of the Xingu and Tapajós rias at least since the mid-Holocene, with carbon burial rates varying from about 84 g m −2 yr −1 to 169 g m −2 yr −1 . However, redox-sensitive elements in sediment core indicate alternation between anoxic/dysoxic and oxic conditions in the water-sediment interface that may be linked to abrupt changes in precipitation. The variation between anoxic/dysoxic and oxic conditions in the water-sediment interface controls organic matter mineralization and methanogenesis. Thus, such changes promoted by hydrological variations significantly affect the capacity of Amazon rias to act either as sources or sinks of carbon.

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“…The Fe/Mn ratio (Fig. 6) displays considerable variations (Boyle, 2001). It has its minimum values between 4900 BC and 3045 BC as well as between 1165 BC and 640 AD.…”

Section: Resultsmentioning

confidence: 99%

Radiocarbon and lead-210 age-depth model and trace elements concentration in the Wolbrom fen (S Poland)

Pawełczyk

Chróst²,

Magiera

et al. 2017

Geochronometria

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A one-meter long peat core was taken from the peatland in Wolbrom (Silesian-Cracovian Upland, southern Poland). The analysis of the botanical composition showed that Wolbrom is a fen. Vegetation species such as Carex rostrata and Phragmites australis have been found. An age-depth model was constructed using 12 conventional radiocarbon dates and 13 lead-210 dates from the upper part of the deposit. In this work, the results of radiocarbon dating are presented. According to the model, we can estimate the age of the fen. The oldest part comes from a depth of 1.05 meter and its conventional age is 5940 ± 95 BP (modelled date 5000-4790 BC, 68.2% probability interval). The accumulation rate varies between approximately 0.53 mm·yr -1 and 6.48 mm·yr -1 .The core has been also tested for the presence of trace elements (Co, Cr, Cu, Fe, Mn, Ni, Pb, Zn) using ICP-OES. There are considerable variations in the concentrations of the tested metals -in many cases the concentration starts to rise at about 40 cm and may be connected with the human activity. This depth corresponds to the modelled age intervals 355-300 BC (17.4%) and 205-45 BC (50.7%).

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Inorganic Geochemical Methods in Palaeolimnology

Cited by 150 publications

References 180 publications

Sedimentary evidence for changes in the pollution status of Taihu in the Jiangsu region of eastern China

Sedimentary evidence for changes in the pollution status of Taihu in the Jiangsu region of eastern China

The Fate of Carbon in Sediments of the Xingu and Tapajós Clearwater Rivers, Eastern Amazon

Radiocarbon and lead-210 age-depth model and trace elements concentration in the Wolbrom fen (S Poland)

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