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Species, valve size, and pretreatment effects on delta O-18 and deltaC-13 values of ostracod valves from Lake Qinghai, Qinghai-Tibet Plateau
Li, Xiangzhong; Liu, Weiguo; Zhang, Pengxi; An, Zhisheng; Zhang, Ling
2007
Source PublicationCHEMICAL GEOLOGY
ISSN0009-2541
Volume246Issue:1-2Pages:124-134
AbstractStable 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.
Other Abstract英文摘要
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.isl.ac.cn/handle/363002/2279
Collection青海盐湖研究所知识仓储
Recommended Citation
GB/T 7714
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.
APA Li, Xiangzhong,Liu, Weiguo,Zhang, Pengxi,An, Zhisheng,&Zhang, Ling.(2007).Species, valve size, and pretreatment effects on delta O-18 and deltaC-13 values of ostracod valves from Lake Qinghai, Qinghai-Tibet Plateau.CHEMICAL GEOLOGY,246(1-2),124-134.
MLA Li, Xiangzhong,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".CHEMICAL GEOLOGY 246.1-2(2007):124-134.
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