Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/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
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ISSN | 0031-0182 |
EISSN | 1872-616X |
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 |
推荐引用方式 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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