Freshwater Carbonate Sedimentation

Kelts, Kerry; Hsü, Kenneth J.

doi:10.1007/978-1-4757-1152-3_9

Cited by 491 publications

(375 citation statements)

References 41 publications

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“…Most of the particulate material in the main tributary (Linth River) is deposited in an upstream lake (Walensee) and in the southern basin of Lake Zurich (Obersee). Dams for flood prevention located on the steep streams that discharge into Lake Zurich along its shore also reduce the input of allochthonous particulate materials (Kelts and Hsu 1978). Some particles must enter the lake in discharges from storm sewers and wastewater treatment plants, although most particles in Lake Zurich are produced directly or indirectly by biological processes within the lake itself (e.g.…”

Section: Experimental Methodologymentioning

confidence: 99%

Particle transport in lakes: Models and measurements

Weilenmann

O’Melia

Stumm

1989

Limnology & Oceanography

169

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Section: Experimental Methodologymentioning

confidence: 99%

Particle transport in lakes: Models and measurements

Weilenmann

O’Melia

Stumm

1989

Limnology & Oceanography

169

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“…Since the onset of anoxia in the bottom waters at the turn of the century, seasonal sediment production has been preserved as distinct "light" (spring/summer) and "dark" (late summer/autumn) laminations (varves) in the Baldeggersee sedimentary record from the period of 1885 to present . Light layers are composed mainly of calcite (60% to 80%) that precipitates in the lake surface waters as a result of biologically induced disequilibrium during spring and summer photosynthetic blooms (Kelts and Hsü, 1978;Lotter et al, 1997;Hodell et al, 1998). The light layers are thick and occasionally, banded (multiple, conspicuous calcite layer).…”

Section: Study Sitementioning

confidence: 99%

A study of oxygen isotopic fractionation during bio-induced calcite precipitation in eutrophic Baldeggersee, Switzerland

Teranes

McKenzie

Bernasconi

et al. 1999

Geochimica et Cosmochimica Acta

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Abstract-In order to better understand environmental factors controlling oxygen isotope shifts in autochthonous lacustrine carbonate sequences, we undertook an extensive one-year study (March, 1995 to February, 1996 of water-column chemistry and daily sediment trap material from a small lake in Central Switzerland. Comparisons between calculated equilibrium isotope values, using the fractionation equation of Friedman and O'Neil (1977) and measured oxygen isotope ratios of calcite in the sediment-traps reveal that oxygen isotopic values of autochthonous calcite (␦ 18 O) are in isotopic equilibrium with ambient water during most of the spring and summer, when the majority of the calcite precipitates. In contrast, small amounts of calcite precipitated in early-spring and again in late-autumn are isotopically depleted in 18 O relative to the calculated equilibrium values, by as much as 0.8‰. This seasonally occurring apparent isotopic nonequilibrium is associated with times of high phosphorous concentrations, elevated pH (ϳ8.6) and increased [CO 3 2Ϫ ] (ϳ50 mol/l) in the surface waters. The resulting weighted average ␦ 18 O value for the studied period is Ϫ9.6‰, compared with a calculated equilibrium ␦ 18 O value of Ϫ9.4‰. These data convincingly demonstrate that ␦ 18 O of calcite are, for the most part, a very reliable proxy for temperature and ␦ 18 O of the water.

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“…Although no sediment trap data are available for Lake Butrint, which would allow us to verify this sedimentation sequence of events, existing water column data are consistent with the proposed scenario. Moreover, a similar seasonal sedimentation pattern is common in many temperate lakes (e.g., Kelts and Hsü, 1978) where carbonate-rich laminae related to high-pH conditions during phytoplankton blooms characterize spring and summer sediment layers. Detritus from terrestrial sources (i.e., Vrina and Vurgus plains), and occasionally through resuspension from the littoral zone, dominate the second layer of a typical organic-rich varve couplet.…”

Section: Model Of Varve Formationmentioning

confidence: 55%

Natural and human-induced environmental change in southern Albania for the last 300years — Constraints from the Lake Butrint sedimentary record

Ariztegui

Anselmetti

Robbiani

et al. 2010

Global and Planetary Change

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a b s t r a c t a r t i c l e i n f oA sediment core from Lake Butrint in southwestern Albania contains an annually-layered sequence covering the last ∼ 300 years. It provides thus an exceptionally well-dated time series to study past climate-driven environmental changes, as well as anthropogenic perturbations along the coast of the Ionian Sea. The varves are composed of organic-rich carbonate couplets and detritus-dominated clay layers. The first are deposited during spring-to-fall, and reflect the chemistry of the lake, which, in turn, is sensitive to 1) the relative importance of marine versus freshwater inputs, 2) relative evaporation rates, and 3) the productivity cycle within the lake. The detrital laminae are deposited during winter, reflecting precipitation and runoff conditions during the wet season. A 2-3‰ stable carbon isotope ratio shift in both bulk organics and authigenic carbonates was attributed to increasing eutrophication towards the end of the 20th century, and validated by historical and instrumental data. An increase in the δ 18 O of authigenic carbonates by more than 8‰ indicates the progressive salinization of the lake, which can primarily be attributed to man-made perturbations that reduced the freshwater input to the lake and/or enhanced the exchange with seawater from the nearby Ionian Sea. A recent increase in the relative evaporation versus precipitation rates may have additionally contributed to the observed 18 O enrichment in the Lake Butrint carbonates. The interdecadal cyclicity in the thickness of the detrital laminae seems to be at least partially controlled by NAO and/or ENSO-like phenomena that modulate precipitation patterns in the eastern Mediterranean. Thus, this study demonstrates the potential of combining microstratigraphic and stable isotopic tools to disentangle anthropogenic and natural environmental changes in Lake Butrint, validated by historical records.

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Freshwater Carbonate Sedimentation

Cited by 491 publications

References 41 publications

Particle transport in lakes: Models and measurements

Particle transport in lakes: Models and measurements

A study of oxygen isotopic fractionation during bio-induced calcite precipitation in eutrophic Baldeggersee, Switzerland

Natural and human-induced environmental change in southern Albania for the last 300years — Constraints from the Lake Butrint sedimentary record

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