Detrital carbonate influences on bulk oxygen and carbon isotope composition of lacustrine sediments from the Mediterranean

Leng, Melanie J.; Jones, Matthew D.; Frogley, Michael R.; Eastwood, Warren J.; Kendrick, Christopher P.; Roberts, C. Neil

doi:10.1016/j.gloplacha.2009.05.005

Cited by 39 publications

(22 citation statements)

References 30 publications

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“…<30 µm idiomorphic calcite crystals (Fig. 4 in Matter et al, 2010) that are typical of authigenic precipitation (Leng et al, 2010). This is in agreement with similar findings of Belmecheri et al (2009) and Lézine et al (2010) in the lake.…”

Section: Oxygen Isotope Composition Of Bulk Calcitesupporting

confidence: 89%

“…Detrital carbonates often have different isotope compositions when compared to authigenic calcites in the sample sediments (e.g. Leng et al, 2010) although this is not always the case. Around Lake Ohrid we sampled the local catchment limestones and they have variable δ 18 O carb values between −9.7‰ and −2.6‰ (Fig.…”

Section: Oxygen Isotope Composition Of Bulk Calcitementioning

confidence: 99%

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Late Quaternary palaeoenvironmental reconstruction from Lakes Ohrid and Prespa (Macedonia/Albania border) using stable isotopes

et al. 2010

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Abstract.Here we present stable isotope data from three sediment records from lakes that lie along the MacedonianAlbanian border (Lake Prespa: 1 core, and Lake Ohrid: 2 cores). The records only overlap for the last 40 kyr, although the longest record contains the MIS 5/6 transition (Lake Ohrid). The sedimentary characteristics of both lakes differ significantly between the glacial and interglacial phases. At the end of MIS 6 Lake Ohrid's water level was low (high δ 18 O calcite ) and, although productivity was increasing (high calcite content), the carbon supply was mainly from inorganic catchment rock sources (high δ 13 C carb ). During the last interglacial, calcite and TOC production and preservation increased, progressively lower δ 18 O calcite suggest increase in humidity and lake levels until around 115 ka. During ca. 80 ka to 11 ka the lake records suggest cold conditions as indicated by negligible calcite precipitation and low organic matter content. In Lake Ohrid, δ 13 C org are complacent; in contrast, Lake Prespa shows consistently higher δ 13 C org suggesting a low oxidation of 13 C-depleted organic matter in agreement with a general deterioration of climate conditions during the glacial. From 15 ka to the onset of the Holocene, calcite and TOC begin to increase, suggesting lake levels were probably low (high δ 18 O calcite ). In the Holocene (11 ka to present) enhanced productivity is manifested by high calcite and organic matter content. All three cores show an early Holocene characterised by low δ 18 O calcite , apart from the very early Holocene phase in Prespa where the lowest Correspondence to: M. J. Leng (mjl@bgs.ac.uk) δ 18 O calcite occurs at ca. 7.5 ka, suggesting a phase of higher lake level only in (the more sensitive) Lake Prespa. From 6 ka, δ 18 O calcite suggest progressive aridification, in agreement with many other records in the Mediterranean, although the uppermost sediments in one core records low δ 18 O calcite which we interpret as a result of human activity. Overall, the isotope data present here confirm that these two big lakes have captured the large scale, low frequency palaeoclimate variation that is seen in Mediterranean lakes, although in detail there is much palaeoclimate information that could be gained, especially small scale, high frequency differences between this region and the Mediterranean.

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Section: Oxygen Isotope Composition Of Bulk Calcitesupporting

confidence: 89%

Section: Oxygen Isotope Composition Of Bulk Calcitementioning

confidence: 99%

Late Quaternary palaeoenvironmental reconstruction from Lakes Ohrid and Prespa (Macedonia/Albania border) using stable isotopes

et al. 2010

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“…Idiomorphic calcite crystals and crystal clusters between 20 and 100 µm have been reported from previous scanning electron microscopy investigations, which show the crystals to be dominantly CaCO 3 (Wagner et al, 2008;Matter et al, 2010). The size and shape of the crystals are typical of endogenic precipitation (Leng et al, 2010b;Lézine et al, 2010), and although CaCO 3 crystals recovered from sediment traps are generally pristine (Matter et al, 2010), those from core material are typically characterised by partial dissolution (Wagner et al, 2009). Within zones of overall low TIC, intermittent spikes to higher TIC were also sampled and the constituent carbonate species investigated using X-ray diffraction (XRD), as X-ray fluorescence (XRF) showed the spikes were high in Fe and Mn (Francke et al, 2016).…”

Section: Analytical Workmentioning

confidence: 73%

“…As Lake Ohrid is located within a karst catchment, a proportion of the carbonate could be of detrital origin, which commonly has a different isotope composition to the endogenic fraction (Leng et al, 2010b). The catchment geology has variable δ 18 O (−9.7 to −2.6 ‰; Leng et al, 2010a); how- Comparison between the high-resolution Holocene δ 18 O c calibration data set from Lake Ohrid Lini core Co1262 (Lacey et al, 2015) and δ 18 O from other regional records, including Lake Pamvotis, Greece (Frogley et al, 2001), Lake Acıgöl, Turkey (Roberts et al, 2001), and Soreq Cave, Israel (Bar-Matthews et al, 1999).…”

Section: Oxygen Isotope Composition Of Calcitementioning

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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“…marl, ostracod, chara, mollusc shells etc (Leng et al, 2010). In this study two approaches were utilised in order to reduce this risk.…”

Section: Methodsmentioning

confidence: 99%

The evolution of Palaeolake Flixton and the environmental context of Star Carr: an oxygen and carbon isotopic record of environmental change for the early Holocene

Candy

Farry

Darvill

et al. 2015

Proceedings of the Geologists' Association

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Abstractdecline is anomalous and cannot be explained by any known temperature shifts, however, this "depletion trend" is seen in several other early Holocene lacustrine records from across the British Isles. The study concludes by suggesting that this decline reflects a shift in the seasonality of precipitation during the early Holocene from a more seasonal precipitation regime typical of a "continental" (strong seasonal contrasts in both temperature and rainfall)climate to a more "maritime" (reduced seasonality in terms of both temperature and rainfall) climate which was characterised by consistent levels of rainfall occurring across the year. The relative timing of the archaeological site of Star Carr suggests that human occupation occurred after this isotopic decline and, therefore, under maritime rather than under continental climate.

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Detrital carbonate influences on bulk oxygen and carbon isotope composition of lacustrine sediments from the Mediterranean

Cited by 39 publications

References 30 publications

Late Quaternary palaeoenvironmental reconstruction from Lakes Ohrid and Prespa (Macedonia/Albania border) using stable isotopes

Late Quaternary palaeoenvironmental reconstruction from Lakes Ohrid and Prespa (Macedonia/Albania border) using stable isotopes

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

The evolution of Palaeolake Flixton and the environmental context of Star Carr: an oxygen and carbon isotopic record of environmental change for the early Holocene

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