Arid
DOI10.1016/j.palaeo.2013.04.022
Environmental and climatic control on seasonal stable isotope variation of freshwater molluscan bivalves in the Turkana Basin (Kenya)
Vonhof, Hubert B.1; Joordens, Josephine C. A.1,2; Noback, Marlijn L.3; van der Lubbe, Jeroen H. J. L.4; Feibel, Craig S.5,6; Kroon, Dick7
通讯作者Vonhof, Hubert B.
来源期刊PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
EISSN1872-616X
出版年2013
卷号383页码:16-26
英文摘要

We present growth incremental stable isotope records (delta O-18 and delta C-13) of modern and similar to 2 Ma fossil bivalve shells from the semi-arid Turkana Basin (N. Kenya, S. Ethiopia). These data suggest that seasonal cyclicity in delta O-18 and delta C-13 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 delta O-18 values in the Turkana Basin catchment.


Cross plots of molluscan delta O-18 and delta C-13 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 delta O-18 and delta C-13 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 delta O-18 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 similar to 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. (C) 2013 Elsevier B.V. All rights reserved.


英文关键词Lake Turkana Molluscs Stable isotopes Palaeoclimate Water chemistry
类型Article
语种英语
国家Netherlands ; Germany ; USA ; Scotland
收录类别SCI-E
WOS记录号WOS:000321421400002
WOS关键词LAKE TURKANA ; AFRICAN CLIMATE ; MASS-BALANCE ; PLIOPLEISTOCENE ; SEDIMENTS ; OXYGEN ; FRACTIONATION ; EVOLUTION ; FRAMEWORK ; RECORDS
WOS类目Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS研究方向Physical Geography ; Geology ; Paleontology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/179139
作者单位1.Vrije Univ Amsterdam, Fac Earth & Life Sci, NL-1081 HV Amsterdam, Netherlands;
2.Leiden Univ, Fac Archaeol, NL-2300 RA Leiden, Netherlands;
3.Univ Tubingen, Senckenberg Ctr Human Evolut & Paleoecol, Dept Early Prehist & Quaternary Ecol, D-72070 Tubingen, Germany;
4.Univ Kiel, Inst Geosci, D-24118 Kiel, Germany;
5.Rutgers State Univ, Dept Geol, Piscataway, NJ 08854 USA;
6.Rutgers State Univ, Dept Anthropol, Piscataway, NJ 08854 USA;
7.Univ Edinburgh, Sch Geosci, Edinburgh EH9 3JW, Midlothian, Scotland
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GB/T 7714
Vonhof, Hubert B.,Joordens, Josephine C. A.,Noback, Marlijn L.,et al. Environmental and climatic control on seasonal stable isotope variation of freshwater molluscan bivalves in the Turkana Basin (Kenya)[J],2013,383:16-26.
APA Vonhof, Hubert B.,Joordens, Josephine C. A.,Noback, Marlijn L.,van der Lubbe, Jeroen H. J. L.,Feibel, Craig S.,&Kroon, Dick.(2013).Environmental and climatic control on seasonal stable isotope variation of freshwater molluscan bivalves in the Turkana Basin (Kenya).PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,383,16-26.
MLA Vonhof, Hubert B.,et al."Environmental and climatic control on seasonal stable isotope variation of freshwater molluscan bivalves in the Turkana Basin (Kenya)".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 383(2013):16-26.
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