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题名: Species, valve size, and pretreatment effects on delta O-18 and deltaC-13 values of ostracod valves from Lake Qinghai, Qinghai-Tibet Plateau
作者: Li, Xiangzhong ;  Liu, Weiguo ;  Zhang, Pengxi ;  An, Zhisheng ;  Zhang, Ling
刊名: CHEMICAL GEOLOGY
出版日期: 2007
卷号: 246, 期号:1-2, 页码:124-134
中文摘要: Stable carbon and oxygen isotope ratios of lacustrine ostracod valves are widely used to deduce paleoenvironmental information. We tested the effects of sample pretreatment methods (methanol, deionised water and methanol, and hydrogen peroxide) on ostracod shell oxygen and carbon isotope compositions. In addition, we examined the stable isotope differences among ostracod valves of different sizes and between the two species (Eucypris inflata and Limnocythere inopinata) present in Lake Qinghai. We found that different treatment methods have no significant effect on the measured C or O stable isotope ratios of ostracod valves, and therefore propose that pretreatment is not needed before isotope analysis. Oxygen isotope ratios of E. inflata were positively correlated with L. inopinata. This correlation suggests that the delta O-18 values of the two species respond similarly to environmental change. The delta C-13 values of E. inflata showed no correlation with L. inopinata, and E. inflata had consistently higher delta C-13 values than L. inopinata. Valve length had no effect on measured delta O-18 values for E. inflata, but delta C-13 values increased with the decreasing shell length (for length classes: < 0.8 mm, 0.8-0.65 mm, 0.65-0.5 mm and < 0.5 mm). Our results suggest that species and size have very little effect on the oxygen isotope composition of ostracod valves, making it easy to work with ostracod samples when studying lake 6180 history. In contrast, much more attention must be paid to the selection of species and size when using the carbon isotope composition of ostracods for palaeoenvironmental reconstruction. (c) 2007 Elsevier B.V. All rights reserved. Stable carbon and oxygen isotope ratios of lacustrine ostracod valves are widely used to deduce paleoenvironmental information. We tested the effects of sample pretreatment methods (methanol, deionised water and methanol, and hydrogen peroxide) on ostracod shell oxygen and carbon isotope compositions. In addition, we examined the stable isotope differences among ostracod valves of different sizes and between the two species (Eucypris inflata and Limnocythere inopinata) present in Lake Qinghai. We found that different treatment methods have no significant effect on the measured C or O stable isotope ratios of ostracod valves, and therefore propose that pretreatment is not needed before isotope analysis. Oxygen isotope ratios of E. inflata were positively correlated with L. inopinata. This correlation suggests that the delta O-18 values of the two species respond similarly to environmental change. The delta C-13 values of E. inflata showed no correlation with L. inopinata, and E. inflata had consistently higher delta C-13 values than L. inopinata. Valve length had no effect on measured delta O-18 values for E. inflata, but delta C-13 values increased with the decreasing shell length (for length classes: < 0.8 mm, 0.8-0.65 mm, 0.65-0.5 mm and < 0.5 mm). Our results suggest that species and size have very little effect on the oxygen isotope composition of ostracod valves, making it easy to work with ostracod samples when studying lake 6180 history. In contrast, much more attention must be paid to the selection of species and size when using the carbon isotope composition of ostracods for palaeoenvironmental reconstruction. (c) 2007 Elsevier B.V. All rights reserved.
英文摘要: 英文摘要
收录类别: SCI
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.isl.ac.cn/handle/363002/2279
Appears in Collections:青海盐湖研究所知识仓储(2014年之前)_期刊论文

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Recommended Citation:
Li, Xiangzhong,Liu, Weiguo,Zhang, Pengxi,et al. Species, valve size, and pretreatment effects on delta O-18 and deltaC-13 values of ostracod valves from Lake Qinghai, Qinghai-Tibet Plateau[J]. CHEMICAL GEOLOGY,2007,246(1-2):124-134.
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