Evaluation of oxygen isotopes in carbonate as an indicator of lake evolution in arid areas: The modern Qinghai Lake, Qinghai-Tibet Plateau

ISL OpenIR > 青海盐湖研究所知识仓储

	Evaluation of oxygen isotopes in carbonate as an indicator of lake evolution in arid areas: The modern Qinghai Lake, Qinghai-Tibet Plateau
	Liu, Weiguo 1,2; Li, Xiangzhong 1,3; Zhang, Ling 1; An, Zhisheng 1; Xu, Liming 4
	2009-10-20
发表期刊	CHEMICAL GEOLOGY
卷号	268 期号:1-2 页码:126-136
关键词	Ostracod Bulk Carbonate Fine-grained Carbonate Oxygen Isotope Lake Qinghai
摘要	The oxygen isotopic composition of carbonate in lakes has been used as a useful indicator in Palaeolimnological research, and has made some important contributions to our understanding of lacustrine systems. For modern lakes in and or cold areas, however, there are few data available to test the effect of lake salinity and temperature on the oxygen isotopic composition of various carbonate sources such as ostracod, bulk carbonate, and fine-grained carbonate (<60 mu m). Here we examined the oxygen isotopic composition of ostracods, bulk carbonate, and fine-grained carbonates, as well as that of coexisting water from Lake Qinghai and the smaller surrounding lakes and ponds on the Qinghai-Tibet Plateau. Our investigation highlights three key effects. First, the oxygen isotopic composition of ostracods, bulk carbonate, and fine-grained carbonate in the takes and ponds shows a clear response to lake water delta(18)O values, and these vary with water salinity. The relationship between lake water delta(18)O and salinity is not only dominated by the evaporation/freshwater input ratios, but is also controlled by the distance to the mouth of the major rivers supplying to the lake. Second, the ostracod, bulk carbonate, and fine-grained carbonate show similar isotopic change trends in the study area, and oxygen isotopic differences between ostracods and authigenic carbonate may be explained by the different water temperatures and very small 'vital offsets' of ostracods. Finally, the effect of water depth on temperature leads to increasing delta(18)O values in carbonates as water depth increases, both in benthic ostracods living on the lake bottom, as well as in bulk carbonate precipitated at the water surface.
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/363002/5917
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.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Peoples R China 2.Xi An Jiao Tong Univ, Sch Human Settlement & Civil Engn, Xian 710049, Peoples R China 3.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China 4.Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810008, Peoples R China
推荐引用方式 GB/T 7714	Liu, Weiguo,Li, Xiangzhong,Zhang, Ling,et al. Evaluation of oxygen isotopes in carbonate as an indicator of lake evolution in arid areas: The modern Qinghai Lake, Qinghai-Tibet Plateau[J]. CHEMICAL GEOLOGY,2009,268(1-2):126-136.
APA	Liu, Weiguo,Li, Xiangzhong,Zhang, Ling,An, Zhisheng,&Xu, Liming.(2009).Evaluation of oxygen isotopes in carbonate as an indicator of lake evolution in arid areas: The modern Qinghai Lake, Qinghai-Tibet Plateau.CHEMICAL GEOLOGY,268(1-2),126-136.
MLA	Liu, Weiguo,et al."Evaluation of oxygen isotopes in carbonate as an indicator of lake evolution in arid areas: The modern Qinghai Lake, Qinghai-Tibet Plateau".CHEMICAL GEOLOGY 268.1-2(2009):126-136.