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Oxygen isotope fractionation in travertine-depositing pools at Baishuitai, Yunnan, SW China: Effects of deposition rates
Hailong Sun; Zaihua Liu; Hao Yan
通讯作者Zaihua Liu
2014
发表期刊Geochimica et Cosmochimica Acta
卷号133期号:1页码:340-350
摘要

Travertine delta O-18 values can be used to reconstruct paleo-temperatures if the oxygen isotope fractionation factors between travertine and water are accurately understood. For this purpose, the delta O-18 values of pool travertine and its parent water, and the deposition rates of the calcite were investigated at Baishuitai (Yunnan, SW China) over the course of the full hydrological year, April 23 2006-April 25 2007. The results show that the travertine-water isotope fractionation factors are close to the commonly accepted equilibrium line of Kim and O'Neil (1997). This differs from the results obtained by Yan et al. (2012) who found that the oxygen isotope fractionation factors in the travertine-depositing pools were close to the line suggested as equilibrium relationship by Coplen (2007). The average calcite deposition rate (2.30 mg cm(-2) d(-1)) in the present study is six times larger than that (0.38 mg cm(-2) d(-1)) in Yan et al. (2012). If slower calcite precipitation leads to equilibrium oxygen isotopic fractionation, then the results of this study support the results of Coplen (2007) that indicate that the equilibrium fractionation factor may be greater than the commonly accepted one derived by Kim and O'Neil (1997). The relationship between oxygen isotope fractionation factor and calcite deposition rate in our study also agrees with the results of Dietzel et al. (2009) who found that the kinetic-isotope effect favors preferential incorporation of O-16 in solid calcite as the calcite deposition rate increases. There was a threshold for calcite precipitation rate control on oxygen isotopic equilibrium. In our case of travertine-depositing pools, when the calcite deposition rate was lower than 0.38 mg cm(-2) d(-1), oxygen isotopic equilibrium between calcite and water was attained. Therefore, calcite deposition rate is a potentially important consideration when using delta O-18 in natural carbonates as a proxy for terrestrial and ocean temperature.

学科领域环境地球化学
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/352002/5207
专题环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
通讯作者Zaihua Liu
推荐引用方式
GB/T 7714
Hailong Sun,Zaihua Liu,Hao Yan. Oxygen isotope fractionation in travertine-depositing pools at Baishuitai, Yunnan, SW China: Effects of deposition rates[J]. Geochimica et Cosmochimica Acta,2014,133(1):340-350.
APA Hailong Sun,Zaihua Liu,&Hao Yan.(2014).Oxygen isotope fractionation in travertine-depositing pools at Baishuitai, Yunnan, SW China: Effects of deposition rates.Geochimica et Cosmochimica Acta,133(1),340-350.
MLA Hailong Sun,et al."Oxygen isotope fractionation in travertine-depositing pools at Baishuitai, Yunnan, SW China: Effects of deposition rates".Geochimica et Cosmochimica Acta 133.1(2014):340-350.
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