Hydrochemistry and isotope composition of springs in the Tecopa basin,southeastern California, USA

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	Hydrochemistry and isotope composition of springs in the Tecopa basin,southeastern California, USA
	Larsen, D; Swihart, GH; Xiao, YK
	2001
发表期刊	CHEMICAL GEOLOGY
ISSN	0009-2541
卷号	179 期号:1-4 页码:17-35
摘要	Springs and seeps in the Tecopa basin were sampled and analyzed for their major ion chemistry and oxygen, hydrogen, and boron isotope compositions in order to assess the possible origins of the waters. The Tecopa basin is a groundwater discharge area along the Amargosa River drainage basin south of the Nevada Test Site and proposed high-level nuclear waste repository at Yucca Mountain, NV. The spring waters are categorized into three end-member hydrochemical facies: (1) pH-neutral, Na + Ca + Mg + SO4 + HCO3 water with moderate to high total-dissolved solids;, (2) mildly alkaline, Na + Cl + SO4 + HCO3 water with high total dissolved solids; and (3) alkaline, Na + HCO3 + CO3 water with high total dissolved solids. The temperatures of most of the springs range from 17 degreesC to 32 degreesC; however, waters in the Tecopa Hot Spring area range from 9 degreesC to 47 degreesC. The oxygen and hydrogen isotope compositions (normalized to SMOW) of the waters are as follows. The facies 1 springs have a mean delta O-18 of - 12.77 +/- 0.14%o (1 sigma) and delta D of - 94.9 +/- 0.5%(o) (1 sigma). The facies 2 springs have a mean delta O-18 of - 12.73 +/- 0.19%o (1 sigma) and delta D of - 97.7 +/- 0.9%o (1 sigma). The facies 3 spring has a mean delta O-18 of - 13.09 +/- 0.17%o (1 sigma) and delta D of - 103.5 +/- 0.7%o (1 sigma). The mean boron concentrations and isotope compositions range from 2.4 mg/l and delta (11) B of + 2.5%o for facies I springs to 72.8 mg/l and delta (11) B of - 3.8%o for the facies 3 spring. Springs and seeps in the Tecopa basin were sampled and analyzed for their major ion chemistry and oxygen, hydrogen, and boron isotope compositions in order to assess the possible origins of the waters. The Tecopa basin is a groundwater discharge area along the Amargosa River drainage basin south of the Nevada Test Site and proposed high-level nuclear waste repository at Yucca Mountain, NV. The spring waters are categorized into three end-member hydrochemical facies: (1) pH-neutral, Na + Ca + Mg + SO4 + HCO3 water with moderate to high total-dissolved solids;, (2) mildly alkaline, Na + Cl + SO4 + HCO3 water with high total dissolved solids; and (3) alkaline, Na + HCO3 + CO3 water with high total dissolved solids. The temperatures of most of the springs range from 17 degreesC to 32 degreesC; however, waters in the Tecopa Hot Spring area range from 9 degreesC to 47 degreesC. The oxygen and hydrogen isotope compositions (normalized to SMOW) of the waters are as follows. The facies 1 springs have a mean delta O-18 of - 12.77 +/- 0.14%o (1 sigma) and delta D of - 94.9 +/- 0.5%(o) (1 sigma). The facies 2 springs have a mean delta O-18 of - 12.73 +/- 0.19%o (1 sigma) and delta D of - 97.7 +/- 0.9%o (1 sigma). The facies 3 spring has a mean delta O-18 of - 13.09 +/- 0.17%o (1 sigma) and delta D of - 103.5 +/- 0.7%o (1 sigma). The mean boron concentrations and isotope compositions range from 2.4 mg/l and delta (11) B of + 2.5%o for facies I springs to 72.8 mg/l and delta (11) B of - 3.8%o for the facies 3 spring.
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/2332
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
推荐引用方式 GB/T 7714	Larsen, D,Swihart, GH,Xiao, YK. Hydrochemistry and isotope composition of springs in the Tecopa basin,southeastern California, USA[J]. CHEMICAL GEOLOGY,2001,179(1-4):17-35.
APA	Larsen, D,Swihart, GH,&Xiao, YK.(2001).Hydrochemistry and isotope composition of springs in the Tecopa basin,southeastern California, USA.CHEMICAL GEOLOGY,179(1-4),17-35.
MLA	Larsen, D,et al."Hydrochemistry and isotope composition of springs in the Tecopa basin,southeastern California, USA".CHEMICAL GEOLOGY 179.1-4(2001):17-35.