Interpreting stable-isotope records from freshwater snail-shell carbonate: a Holocene case study from Lake Gölhisar, Turkey

Holocene - Tập 12 Số 5 - Trang 629-634 - 2002
Matthew D. Jones1, Melanie J. Leng2, Warren J. Eastwood3, D. H. Keen4, Chris Turney1
1Centre for Quaternary Research, Department of Geography, Royal Holloway, University of London, Egham Surrey TW20 OEX, UK
2NERC Isotope, Geosciences Laboratory, British Geological Survey, Nottingham NG12 5GG, UK
3School of Geography and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
4Centre for Quaternary Science, Coventry University, Priory Street, Coventry, CV1 5FB, UK

Tóm tắt

The oxygen and carbon stable-isotope ratios from fossil snail shells within a small intramontane lake in southwest Turkey are used to highlight the potential, and problems, of using freshwater snail carbonate as a palaeoenvironmental proxy. Two species (Gyraulus piscinarum and Valvata cristata) yielded different isotope ratios at the same sampling intervals, probably due to differences in water-isotope composition between different microhabitats. Isotope ratios from a number of individual shells from the same sampling intervals (representing 7–25 years), show large ranges (up to 8‰ for 18O) for each species. Only by analysis of a significant number of species-specific shells (5) from each sampling interval can a true understanding of environmental change be obtained. Averages of the data provide an insight into longer-term climatic variation while the ranges provide an estimate of short-term (decadal) environmental variability.

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Thông tin
Thông tin xuất bản

Holocene

Tập 12 Số 5

629-634

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