Species, valve size, and pretreatment effects on delta O-18 and delta C-13 values of ostracod valves from Lake Qinghai, Qinghai-Tibet Plateau

ISL OpenIR > 青海盐湖研究所知识仓储

	Species, valve size, and pretreatment effects on delta O-18 and delta C-13 values of ostracod valves from Lake Qinghai, Qinghai-Tibet Plateau
	Li, Xiangzhong ; Liu, Weiguo ; Zhang, Pengxi ; An, Zhisheng ; Zhang, Ling
	2007-11-30
发表期刊	CHEMICAL GEOLOGY
卷号	246 期号:1-2 页码:124-134
关键词	Ostracod Species Size Carbon Oxygen Isotopes Lake Qinghai
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.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/5799
专题	青海盐湖研究所知识仓储中国科学院青海盐湖研究所
作者单位	1.State Key Lab Loess & Quaternary Geol, IEE, CAS, Xian 710075, Peoples R China 2.Grad Sch Chinese Acad Sci, Beijing 100039, Peoples R China 3.Xian Jiaotong Univ, Xian 710049, Peoples R China 4.Qinghai Inst Salt Lakes, CAS, Xian Branch, Xian 710045, Peoples R China
推荐引用方式 GB/T 7714	Li, Xiangzhong,Liu, Weiguo,Zhang, Pengxi,et al. Species, valve size, and pretreatment effects on delta O-18 and delta C-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 delta C-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 delta C-13 values of ostracod valves from Lake Qinghai, Qinghai-Tibet Plateau".CHEMICAL GEOLOGY 246.1-2(2007):124-134.