RESP  > 地球快报-2018年第10期
DOI: 10.1016/j.gca.2017.10.009
篇名:
Oxygen isotope fractionation in the siderite-water system between 8.5 and 62 degrees C
作者: van Dijk, Joep; Fernandez, Alvaro; Mueller, Inigo A.; Lever, Mark; Bernasconi, Stefano M.
通讯作者: van Dijk, J (reprint author), ETH, Dept Earth Sci, Sonneggstr 5, CH-8092 Zurich, Switzerland.
发表期刊: GEOCHIMICA ET COSMOCHIMICA ACTA
ISSN: 0016-7037
EISSN: 1872-9533
出版年: 2018
卷: 220, 页码:535-551
发表日期: 2018
语种: 英语
领域: 地球科学 ; 资源环境 ; 气候变化
英文摘要: The oxygen isotope composition of siderites can be used to deduce the temperature and/or oxygen isotope composition of the fluids from which they precipitated. Previous siderite-water oxygen isotope fractionation calibrations are not well constrained at temperatures below 33 degrees C where most of the siderite forms at the Earth's surface. Moreover, the few experimental low temperature calibration points available are possibly inaccurate as the corresponding siderites may not have formed in equilibrium with the solution. In this study, we synthesized siderite in the laboratory from 8.5 to 62 degrees C, using both active-degassing experiments and microbial cultures. We used the enzyme carbonic anhydrase, which significantly reduces the equilibration time of oxygen isotopes among all dissolved inorganic carbon (DIC) species and water to minimize siderite formation out of equilibrium. Our calibration is based on many more data points than previous calibrations and significantly reduces the uncertainty in siderite-water oxygen isotope fractionation in natural siderites formed at low temperatures. The best fit equation is 1000 * In alpha = 19.67 +/- 0.42 (10(3/)T) - 36.27 +/- 1.34 where a (1000 + delta O-18(siderite)/1000 + delta O-18(water)) is the fractionation factor and T is the temperature in Kelvin. (C) 2017 Elsevier Ltd. All rights reserved.
英文关键词: Oxygen isotope fractionation ; Siderite ; Ambient temperature
收录类别: SCI-E
WOS记录号: WOS:000416502300031
WOS关键词: SEAWATER CARBONATE CONCENTRATION ; GREENHOUSE HYDROLOGIC-CYCLE ; DEPOSITIONAL ENVIRONMENT ; BIOLOGICAL CARBONATES ; CATALYTIC MECHANISM ; DIAGENETIC SIDERITE ; PEDOGENIC SIDERITE ; STABLE-ISOTOPES ; RAPID METHOD ; GROWTH-RATE
WOS学科: Geochemistry & Geophysics
WOS研究方向: Geochemistry & Geophysics
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资源类型: 期刊论文
条目标识符: http://119.78.100.173/handle/2MONF3CL/87302
Appears in Collections:地球快报-2018年第10期

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Recommended Citation:
van Dijk, Joep,Fernandez, Alvaro,Mueller, Inigo A.,et al. Oxygen isotope fractionation in the siderite-water system between 8.5 and 62 degrees C[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2018,220:535-551.
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