Origin and dynamics of Fe and Mn sedimentary layers in Lake Baikal

Granina, L. Z.; Müller, Beat; Wehrli, Bernhard

doi:10.1016/j.chemgeo.2003.12.018

Cited by 85 publications

(72 citation statements)

References 32 publications

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“…These layers were formed during warm stages at the boundary of oxic to anoxic sediments and later became reduced when this boundary migrated upwards. Similar layers have been described from Lake Baikal (Granina et al, 2004). The formation of Fe/Mn-layers interfered with sediment dehydration by an unknown factor and it may also be possible that these layers are not in radioactive equilibrium.…”

Section: Influence Of Water Content On Age Calculationmentioning

confidence: 70%

Applying SAR-IRSL methodology for dating fine-grained sediments from Lake El’gygytgyn, north-eastern Siberia

Juschus

Preusser

Melles

et al. 2007

Quaternary Geochronology

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Lake El'gygytgyn is situated in a 3.6 Ma old impact crater in north-eastern Siberia and probably represents one of the most complete archives of Arctic climate change. Investigated here is the potential of infra-red stimulated luminescence (IRSL) using the single-aliquot regenerative-dose (SAR) approach for dating sediments from this lake. Independent age control is available from a published age model of a parallel core that is based on tuning sediment proxies with regional insolation and the results of previous multiple aliquot IRSL dating. Although the site is located within volcanic bedrock, anomalous fading seems to have little effect on the calculated ages. The modelled water content for the entire time of burial is seen as the most prominent uncertainty at this particular site. Despite these potential error sources, SAR-IRSL ages are in acceptable agreement with the given timeframe and clearly point to the possibility to establish independent chronologies at this site up to at least 400,000 years. r

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Section: Influence Of Water Content On Age Calculationmentioning

confidence: 70%

Applying SAR-IRSL methodology for dating fine-grained sediments from Lake El’gygytgyn, north-eastern Siberia

Juschus

Preusser

Melles

et al. 2007

Quaternary Geochronology

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“…2) and hence suggest concretions formed along particular horizons. Concretionary Mn and Fe horizons have also been observed in the glacial Lake Ohrid sediments (Vogel et al, 2010a) and in Lake Baikal sediments (Granina et al, 2004) where they are thought to be related to either shifts in the redox conditions of the bottom waters or by significant change in the sedimentation regime. The dark horizons thus likely represent paleo redox fronts, which are partly preserved in the sediment.…”

Section: Resultsmentioning

confidence: 91%

Environmental change within the Balkan region during the past ca. 50 ka recorded in the sediments from lakes Prespa and Ohrid

et al. 2010

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Abstract. Lakes Prespa and Ohrid, in the Balkan region, are considered to be amongst the oldest lakes in Europe. Both lakes are hydraulically connected via karst aquifers. From Lake Ohrid, several sediment cores up to 15 m long have been studied over the last few years. Here, we document the first long sediment record from nearby Lake Prespa to clarify the influence of Lake Prespa on Lake Ohrid and the environmental history of the region. Radiocarbon dating and dated tephra layers provide robust age control and indicate that the 10.5 m long sediment record from Lake Prespa reaches back to 48 ka. Glacial sedimentation is characterized by low organic matter content and absence of carbonates in the sediments, which indicate oligotrophic conditions in both lakes. Holocene sedimentation is characterized by particularly high carbonate content in Lake Ohrid and by particularly high organic matter content in Lake Prespa, which indicates a shift towards more mesotrophic conditions in the latter. Long-term environmental change and short-term events, such as related to the Heinrich events during the Pleistocene or the 8.2 ka cooling event during the Holocene, are well recorded in both lakes, but are only evident in certain proxies. The comparison of the sediment cores from both lakes indicates that environmental change affects particularly the trophic state of Lake Prespa due to its lower volume and water depth.

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“…The siderite is therefore most likely to be early diagenetic and formed before compaction within the sediment. Discrete horizons enriched in Fe have been previously observed in Lake Ohrid , neighbouring Lake Prespa Leng et al, 2013), and in other ancient lakes, such as Lake Baikal (Granina et al, 2004), where the formation of Fe-enriched layers up to approximately 25 cm below the sediment-water interface is thought to be related to bottom water redox conditions and significant changes in sedimentation regime. Assuming the siderite is formed in superficial sediments during the initial stages of diagenesis, like calcite, its isotope composition can be used as an indicator of depositional environment (Mozley and Wersin, 1992 Neil et al (1969) and a precipitation temperature of +18 • C (±3 • C) to represent average summer conditions within the photic zone during the period of maximum phytoplankton activity.…”

Section: Oxygen Isotope Composition Of Sideritementioning

confidence: 99%

Northern Mediterranean climate since the Middle Pleistocene: a 637 ka stable isotope record from Lake Ohrid (Albania/Macedonia)

et al. 2016

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Abstract. Lake Ohrid (Macedonia/Albania) is an ancient lake with unique biodiversity and a site of global significance for investigating the influence of climate, geological, and tectonic events on the generation of endemic populations. Here, we present oxygen (δ 18 O) and carbon (δ 13 C) isotope data from carbonate over the upper 243 m of a composite core profile recovered as part of the Scientific Collaboration on Past Speciation Conditions in Lake Ohrid (SCOP-SCO) project. The investigated sediment succession covers the past ca. 637 ka. Previous studies on short cores from the lake (up to 15 m, < 140 ka) have indicated the total inorganic carbon (TIC) content of sediments to be highly sensitive to climate change over the last glacial-interglacial cycle. Sediments corresponding to warmer periods contain abundant endogenic calcite; however, an overall low TIC content in glacial sediments is punctuated by discrete bands of early diagenetic authigenic siderite. Isotope measurements on endogenic calcite (δ 18 O c and δ 13 C c ) reveal variations both between and within interglacials that suggest the lake has been subject to palaeoenvironmental change on orbital and millennial timescales. We also measured isotope ratios from authigenic siderite (δ 18 O s and δ 13 C s ) and, with the oxygen isotope composition of calcite and siderite, reconstruct δ 18 O of lake water (δ 18 O lw ) over the last 637 ka. Interglacials have higher δ 18 O lw values when compared to glacial periods most likely due to changes in evaporation, summer temperature, the proportion of winter precipitation (snowfall), and inflow from adjacent Lake Prespa. The isotope stratigraphy suggests Lake Ohrid experienced a period of general stability from marine isotope stage (MIS) 15 to MIS 13, highlighting MIS 14 as a particularly warm glacial. Climate conditions became progressively wetter during MIS 11 and MIS 9. Interglacial periods after MIS 9 are characterised by increasingly evaporated and drier conditions through MIS 7, MIS 5, and the Holocene. Our results provide new evidence for long-term climate change in the northern Mediterranean region, which will form the basis to better understand the influence of major environmental events on biological evolution within Lake Ohrid.

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Origin and dynamics of Fe and Mn sedimentary layers in Lake Baikal

Cited by 85 publications

References 32 publications

Applying SAR-IRSL methodology for dating fine-grained sediments from Lake El’gygytgyn, north-eastern Siberia

Applying SAR-IRSL methodology for dating fine-grained sediments from Lake El’gygytgyn, north-eastern Siberia

Environmental change within the Balkan region during the past ca. 50 ka recorded in the sediments from lakes Prespa and Ohrid

Northern Mediterranean climate since the Middle Pleistocene: a 637 ka stable isotope record from Lake Ohrid (Albania/Macedonia)

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