Estimation of grain size variability with micro X-ray fluorescence in laminated lacustrine sediments, Cape Bounty, Canadian High Arctic

Cuven, Stéphanie; Francus, Pierre; Lamoureux, Scott F.

doi:10.1007/s10933-010-9453-1

Cited by 146 publications

(127 citation statements)

References 38 publications

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“…This transition coincides with major changes in chemical, mineral magnetic and acoustic parameters, which are linked to substantially altered in-lake processes and sedimentation conditions. An increase in grain size is indicated by increasing Zr/K ratios [68], possibly corroborated by an increase in water content (Figures 5 and 8). The increase in grain size may be related to the cessation of the direct influence of glacial activity in the basin, which can be assumed to have led to primarily clay deposition at the distal position represented by our coring site and replacement with mineral matter of predominantly fluvial origin from the wider catchment.…”

Section: Lake and Catchment Processes During The Holocene (Lithologicmentioning

confidence: 55%

“…The black layers are characterized by a slightly larger grain size than the clay gyttja ( Figure 11). The grain size proxy Zr/K [68] also indicates a larger average grain size of the black layers compared to bulk sediment samples (Figure 11). …”

Section: Characterization and Temporal Distribution Of Black Layersmentioning

confidence: 98%

“…Ca concentrations are negatively correlated with organic matter content (r = −0.40) and positively correlated with the lithogenic elements (mean r = 0.51). The transition from Unit II to III is also characterized by elevated Zr/K ratios (Figure 8), pointing to a coarser grain size [68], as well as by an increase in the water content of the sediments ( Figure 5). Mo/Al ratios are low throughout Unit II, indicating oxic conditions at the sediment-water interface [69,70], then increase abruptly at the Unit II-III transition, followed by several minor peaks.…”

Section: Chemical Sediment Propertiesmentioning

confidence: 99%

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Holocene Hydroclimate Variability in Central Scandinavia Inferred from Flood Layers in Contourite Drift Deposits in Lake Storsjön

et al. 2018

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Despite the societal importance of extreme hydroclimate events, few palaeoenvironmental studies of Scandinavian lake sediments have investigated flood occurrences. Here we present a flood history based on lithological, geochemical and mineral magnetic records of a Holocene sediment sequence collected from contourite drift deposits in Lake Storsjön (63.12 • N, 14.37 • E). After the last deglaciation, the lake began to form around 9800 cal yr BP, but glacial activity persisted in the catchment for~250 years. Element concentrations and mineral magnetic properties of the sediments indicate relatively stable sedimentation conditions during the Holocene. However, human impact in the form of expanding agriculture is evident from about 1100 cal yr BP, and intensified in the 20th century. Black layers containing iron sulphide appear irregularly throughout the sequence. The increased influx of organic matter during flood events led to decomposition and oxygen consumption, and eventually to anoxic conditions in the interstitial water preserving these layers. Elevated frequencies of black layer occurrence between 3600 and 1800 cal yr BP reflect vegetation changes in the catchment as well as large-scale climatic change. Soil erosion during snowmelt flood events increased with a tree line descent since the onset of the neoglacial period (~4000 cal yr BP). The peak in black layer occurrence coincides with a prominent solar minimum~2600 cal yr BP, which may have accentuated the observed pattern due to the prevalence of a negative NAO index, a longer snow accumulation period and consequently stronger snowmelt floods.

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Section: Lake and Catchment Processes During The Holocene (Lithologicmentioning

confidence: 55%

Section: Characterization and Temporal Distribution Of Black Layersmentioning

confidence: 98%

Section: Chemical Sediment Propertiesmentioning

confidence: 99%

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Holocene Hydroclimate Variability in Central Scandinavia Inferred from Flood Layers in Contourite Drift Deposits in Lake Storsjön

et al. 2018

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“…Fe, K, Rb, Ti and are associated with clays and fine grained materials (Cuven et al, 2010;Kylander et al, 2011), and Si indicates coarse silt and sand. Ti indicates allochthonous inputs from the catchment (Cohen, 2003) and is immobile in sediments.…”

Section: Zone 1 (190-110cm)mentioning

confidence: 99%

“…Fe, K, Ti and Rb with clays and fine grained materials (Cuven et al, 2010;Kylander et al, 2011), Si with coarse silt and sand. Detrital indicators are a proxy for changes in runoff within a catchment (Corella et al, 2012;Metcalfe et al, 2010), detrital input (Balascio et al, 2011) Ti and Fe peak in zones 1 of WS01 and WCS01 are associated with slightly higher clay content and low median grain size.…”

Section: Variations In Elements Throughmentioning

confidence: 99%

Palaeoecology of the South Wellesley Archipelago. A history of human occupation and environmental change

Mackenzie¹

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A wealth of palaeoecological studies from the Australasian region identify periods of significant environmental change during the Holocene. However, relatively few studies have focused on the coastal lowlands of tropical northern Australia, limiting our ability to accurately reconstruct this vast bioregion's history. This study addresses the gap in spatially distributed paleoenvironmental research in northern Australia by producing the first reconstructions from the South Wellesley This research examined seven sediment profiles using micro X-ray fluorescence geochemical data and particle size analysis.

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Magnetic and geochemical signatures of flood layers in a lake system

Støren

Paasche

Hirt

et al. 2016

Geochem Geophys Geosyst

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River floods holds the capasity to erode and transport sediments that are deposited whenever the discharge is reduced. In catchments that are subjected to repeated flooding, downstream lakes can therefore contain a record of past events across multiple timescales. High-resolution core scanning analyses, such as X-ray fluorescence (XRF) scanning and magnetic susceptibility (MS) provide data that are frequently used to detect flood layers in soft sediment archives, such as lakes, fjords and ocean basins. Deposits of past floods also can potentially reveal information about the evolution of flood events as well as source area.Here we explore ways in which subtle variability in high-resolution data can be utilized and subsequently vetted by high-precision measurements in order to delineate the copious information that can be extracted from soft sediment records. By combining magnetic hysteresis measurements and first-order reversal curves (FORCs) with inductively coupled plasma optical emission spectrometer (ICP-OES) measurements of chemical elements on 36 samples, questions about flood dynamics and variability are raised, and also sources of noise in high-resolution scanning techniques are discussed. Specifically, we show that a lake flood record from Southern Norway containing 92 floods distributed over 10,000 years can be subdivided into two groups of floods that were generated either by spring snow melting, intense summer rainstorms, or a combination of both. The temporal evolution of this pattern shows a marked shift toward spring floods around 2000 years ago compared to the earlier part of the record.Various approaches have been employed in order to detect flood layers in lake sediments. These include high-resolution measurements such as X-ray fluorescence (XRF) scanning [e.g., Czymzik et al., 2013; Swierczynski et al., 2013; Wilhelm et al., 2016], magnetic susceptibility [e.g., Støren et al., 2010; Arnaud et al.,

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Estimation of grain size variability with micro X-ray fluorescence in laminated lacustrine sediments, Cape Bounty, Canadian High Arctic

Cited by 146 publications

References 38 publications

Holocene Hydroclimate Variability in Central Scandinavia Inferred from Flood Layers in Contourite Drift Deposits in Lake Storsjön

Holocene Hydroclimate Variability in Central Scandinavia Inferred from Flood Layers in Contourite Drift Deposits in Lake Storsjön

Palaeoecology of the South Wellesley Archipelago. A history of human occupation and environmental change

Magnetic and geochemical signatures of flood layers in a lake system

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