The effect of species on lacustrine δ18Odiatom and its implications for palaeoenvironmental reconstructions

The effect of species on lacustrine δ18Odiatom and its implications for palaeoenvironmental reconstructions
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物种对湖相δ18硅藻的影响及其对古环境重建的意义

DOI:
10.1002/jqs.2711
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发表时间:
2014
影响因子:
2.3
通讯作者:
D. Kaufman
D. Kaufman
中科院分区:
地球科学3区
文献类型:
--
作者:
H. Bailey;A. Henderson;H. Sloane;A. Snelling;M. Leng;D. Kaufman

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硅藻的氧同位素组成(δ180Oditom)越来越多地被用于从海洋和湖泊沉积档案中重建气候。虽然硅藻被认为与周围的水在同位素平衡的情况下沉淀它们的锥体,但还不清楚给定物种的内部过程是否影响水和硅藻之间的氧的分馏。我们给出了阿拉斯加州心湖沉积物岩芯中不同物种的两个硅藻粒度组分(3-38和>38 µm)的硅藻数据。两个大小组分之间的δ18Oditom的差异在0到1.2‰之间,平均偏移量为0.01‰(n = 20)。傅立叶变换红外光谱证实,我们的样品由纯生物二氧化硅(SiO_2)和δ180硅藻组成,不受污染的影响。最大偏移量在误差范围之外,但平均值在技术的分析误差(± 1.06‰)之内,表明δ180Oditom中没有明显的物种依赖分馏。我们认为,湖相δ180C硅藻测量为重建δ180O水提供了一种可靠和有价值的方法。考虑到我们两个记录中存在较小的偏移量,我们建议仅在变化幅度大于综合分析误差的情况下才解释δ180oditom中的位移。
The oxygen isotope composition of diatom silica (δ18Odiatom) is increasingly being used to reconstruct climate from marine and lacustrine sedimentary archives. Although diatoms are assumed to precipitate their frustule in isotopic equilibrium with their surrounding water, it is unclear whether internal processes of a given species affect the fractionation of oxygen between the water and the diatom. We present δ18Odiatom data from two diatom size fractions (3–38 and >38 µm) characterized by different species in a sediment core from Heart Lake, Alaska. Differences in δ18Odiatom between the two size fractions varies from 0 to 1.2‰, with a mean offset of 0.01‰ (n = 20). Fourier transform infrared spectroscopy confirms our samples consist of pure biogenic silica (SiO2) and δ18Odiatom trends are not driven by contamination. The maximum offset is outside the range of error, but the mean is within analytical error of the technique (± 1.06‰), demonstrating no discernible species‐dependent fractionation in δ18Odiatom. We conclude that lacustrine δ18Odiatom measurements offer a reliable and valuable method for reconstructing δ18Owater. Considering the presence of small offsets in our two records, we advise interpreting shifts in δ18Odiatom only where the magnitude of change is greater than the combined analytical error.
DOI: 10.1130/g32454.1
发表时间: 2011-11
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影响因子: 5.8
作者:
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通讯作者: O. Romero;George E. A. Swann;D. Hodell;P. Helmke;D. Rey;B. Rubio
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发表时间: 2013
期刊: Nature Geoscience
影响因子: 18.3
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DOI: 10.5194/cpd-6-1629-2010
发表时间: 2010
期刊: --
影响因子: --
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