干旱区生态环境知识资源中心(Arid): 柴达木盆地西部地下卤水水化学特征及其起源演化

Arid

	柴达木盆地西部地下卤水水化学特征及其起源演化
其他题名	Hydrochemical Characteristics, Origin and Evolution of the Subsurface Brines in Western Qaidam Basin
	韩佳君 1; 周训 2; 姜长龙 1; 胡良君 3; 方斌 2; 孙琦 4
来源期刊	现代地质
ISSN	1000-8527
出版年	2013
卷号	27 期号:6 页码:1454-1464
中文摘要	柴达木盆地西北角分布有基岩,盆地西部分布山麓堆积及河、湖相沉积地层,新生界发育有多个北西南东走向的规模不一的背斜,新近系分布有富钾地下卤水。利用统计方法分析卤水中TDS、K~+和B_2O_3的富集情况。结果显示:TDS值出现双峰,卤水样品富K~+和B~(3+)的概率分别为62.8%和61.29%。使用Piper图研究地下卤水时,经常出现样品点过于集中而不易反映主要离子含量的变化。本次研究改进了前人的图示方法,绘制适合于表示地下卤水的水化学图。利用钠氯系数、氯溴系数、氯碘系数、钾氯系数、脱硫系数、钙镁系数对研究区卤水水样进行分析,结果显示卤水样品多数未达到石盐沉积,少数达到石盐沉积。研究区水样氢、氧稳定同位素数据显示新近系地下卤水delta~(18)O值和deltaD值均发生漂移,表明卤水经历长时间的蒸发浓缩。研究区地下卤水起源于早上新世的古大气降水,上新世以后由于青藏高原快速隆升,柴达木盆地抬升和沉降中心东移,接受沉积形成良好的盖层,同时大气环流的改变致使气候变得干燥,地下卤水经历蒸发浓缩封存,形成现今的卤水。
英文摘要	Basement rocks occur in the northwestern corner of the Qaidam Basin and piedmont deposits and alluvial and lacustrine sediments prevail in the western basin.Several NWSE trending anticlines of different sizes occur in the Cenozoic sediments in the western basin.K~+rich brines have been found in the Neogene sediments in the western Qaidam Basin.In this paper, statistic methods are used to examine the enrichment of TDS, K~+ and B_2O_3 of the subsurface brines.The results show that the TDS of the brines are of bipeak values and the brines are rich in K~+ and B~(3+) with enrichment probabilities of 62.8% and 61.29%, respectively.When the Piper diagram is used to study brine samples, the data points are usually too concentrated to show the changes of the main ions.The previous methods are modified to express hydrochemistry of subsurface brines.Ratios of Na~+ to Cl~-, Cl~- to Br~-, Cl~- to I~-, K~+ to Cl~-, SO2-4 to Cl- and Ca~(2+) to Mg~(2+) are employed to analyze the brine samples, indicating that most of the brine samples are not saturated with respect to halite and only a small number of the brine samples are saturated with respect to halite.The delta~(18)O and deltaD of the brine samples in the study area show both the 18O shift and the D shift, indicating a long time evaporation and concentration of the brines.The subsurface brines originated from the paleometeoric water of Neogene age.The Qaidam Basin uplifted and its subsidence center moved eastwards due to the quick uplift of the QinghaiTibet Plateau after Pliocene.The basin received sediments and the caprocks of the brinebearing formations formed.In the meanwhile, the change in atmospheric circumfluence led to an arid climate.As a result, the subsurface brines become the presentday brines after a long time evaporation, concentration and under a sealed state.
中文关键词	卤水 ; 水化学 ; 特征系数 ; 起源演化 ; 柴达木盆地
英文关键词	brine hydrochemistry ion ratio origin and evolution Qaidam Basin
语种	中文
国家	中国
收录类别	CSCD
WOS类目	MINERALOGY
WOS研究方向	Mineralogy
CSCD记录号	CSCD:5002691
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/230345
作者单位	1.中国地质大学(北京)水资源与环境学院, 北京 100083, 中国; 2.中国地质大学(北京)水资源与环境学院, 地下水循环与环境演化教育部重点实验室, 北京 100083, 中国; 3.天津地热勘查开发设计院, 天津 300250, 中国; 4.西北核技术研究所, 西安, 陕西 710024, 中国
推荐引用方式 GB/T 7714	韩佳君,周训,姜长龙,等. 柴达木盆地西部地下卤水水化学特征及其起源演化[J],2013,27(6):1454-1464.
APA	韩佳君,周训,姜长龙,胡良君,方斌,&孙琦.(2013).柴达木盆地西部地下卤水水化学特征及其起源演化.现代地质,27(6),1454-1464.
MLA	韩佳君,et al."柴达木盆地西部地下卤水水化学特征及其起源演化".现代地质 27.6(2013):1454-1464.