globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2013.04.022
论文题名:
Environmental and climatic control on seasonal stable isotope variation of freshwater molluscan bivalves in the Turkana Basin (Kenya)
作者: Vonhof H.B.; Joordens J.C.A.; Noback M.L.; van der Lubbe J.H.J.L.; Feibel C.S.; Kroon D.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 383-384
起始页码: 16
结束页码: 26
语种: 英语
英文关键词: Lake Turkana ; Molluscs ; Palaeoclimate ; Stable isotopes ; Water chemistry
英文摘要: We present growth incremental stable isotope records (δ18O and δ13C) of modern and ~2Ma fossil bivalve shells from the semi-arid Turkana Basin (N. Kenya, S. Ethiopia). These data suggest that seasonal cyclicity in δ18O and δ13C recorded by modern and fossil shells is driven by wet-dry seasonal changes in host water chemistry, forced by monsoonal rainfall over the Ethiopian Highlands.Fully lacustrine shells show lower amplitude, or even absent seasonal cyclicity in comparison with deltaic or riverine shells because of the buffering effect of the large water volume in the lake setting. Riverine shells arguably have the clearest relation to seasonally variable climate parameters. Riverine molluscs thus provide a potentially valuable proxy for varying rainfall δ18O values in the Turkana Basin catchment.Cross plots of molluscan δ18O and δ13C data reveal dominant environmental control on molluscan isotope values with remarkably large isotopic differences between lacustrine, deltaic and riverine environments. We interpret this isotope pattern to directly result from the different mixing proportions of Omo River source water with evaporated lake water in these environments. The interpretation of fossil molluscan δ18O and δ13C data in a palaeoclimatological context is not straightforward, since the potential influence of temporal changes in lake water temperature, surface evaporation or river discharge on the δ18O budget of the lake is smaller than the isotopic shifts caused by shifting facies patterns in the sedimentary record.Even though it is clear from the rich molluscan faunas that the ~. 2. Ma palaeo-Lake Lorenyang must have been significantly less alkaline than modern Lake Turkana and likely provided good drinking water and abundant availability of food for the different species of hominins inhabiting the region at that time, stable isotope values of molluscan bivalves are not suitable to record the difference in alkalinity between these two settings. © 2013 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69716
Appears in Collections:过去全球变化的重建

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作者单位: Faculty of Earth and Life Sciences of the VU-University Amsterdam, De Boelelaan 1085, 1081HV Amsterdam, Netherlands; Faculty of Archaeology, Leiden University, P.O. Box 9515, 2300 RA Leiden, Netherlands; Paleoanthropology, Department of Early Prehistory and Quaternary Ecology, Senckenberg Center for Human Evolution and Paleoecology, Eberhard Karls University of Tübingen, Rümelinstrasse 23, D-72070 Tübingen, Germany; Institute of Geosciences, University of Kiel, Ludewig-Meyn-Str. 10, D-24118 Kiel, Germany; Dept. of Geology, Rutgers University, 610 Taylor Road, Piscataway, NJ 08854-8066, United States; Dept. of Anthropology, Rutgers University, 610 Taylor Road, Piscataway, NJ 08854-8066, United States; School of Geosciences, The University of Edinburgh, West Mains Road, Edinburgh EH9 3JW, United Kingdom

Recommended Citation:
Vonhof H.B.,Joordens J.C.A.,Noback M.L.,et al. Environmental and climatic control on seasonal stable isotope variation of freshwater molluscan bivalves in the Turkana Basin (Kenya)[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,383-384
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