Sr-isotope analysis of speleothems by LA-MC-ICP-MS: High temporal resolution and fast data acquisition

Sr-isotope analysis of speleothems by LA-MC-ICP-MS: High temporal resolution and fast data acquisition
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通过 LA-MC-ICP-MS 对洞穴沉积物进行 Sr 同位素分析:高时间分辨率和快速数据采集

DOI:
10.1016/j.chemgeo.2017.08.012
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发表时间:
2017
期刊:
影响因子:
3.9
通讯作者:
Scholz
Scholz
中科院分区:
地球科学2区
文献类型:
--
作者:
Wassenburg;Jochum;Breitenbach;Scholz

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洞穴沉积物是完善的气候档案。一系列广泛的地球化学代用指标,包括稳定同位素和微量元素存在于洞穴沉积物中,以重建过去的气候变化。然而,每一个替代指标都受到多种因素的影响,往往妨碍了可靠的解释。锶同位素比值(87 Sr/86 Sr)可以提供有用的信息,水的停留时间和水混合在主机岩石,因为它们不分馏过程中方解石沉淀。激光烧蚀多接收器感应耦合等离子体质谱法(LA-MC-ICP-MS)很少用于测定洞穴沉积物中的Sr同位素特征,因为洞穴沉积物通常不具有适当高浓度的Sr来促进这种分析。然而,这种方法的优点包括快速的数据采集,更高的空间分辨率,更大的样品通量和分析前没有化学处理。我们目前的LA-MC-ICP-MS锶同位素数据从两个洞穴沉积物从摩洛哥(石窟皮斯)和印度(Mawmluh洞),我们比较线扫描和斑点分析消融技术沿着洞穴沉积物生长轴。我们的LA-MC-ICP-MS Sr数据的分析不确定度与对其他碳酸盐材料进行的研究相当。这两种消融技术的结果是可重复的分析误差内,这意味着这种技术产生强大的结果时,适用于洞穴积土。此外,不同碳酸盐参考材料(即MACS-3,JCt-1,JCp-1)的几个比较测量,包括标准括号法测试和纳秒激光烧蚀系统与最先进的飞秒激光烧蚀系统的87 Sr/86 Sr比值比较,突出了该方法的鲁棒性。
Speleothems are well established climate archives. A wide array of geochemical proxies, including stable isotopes and trace elements are present within speleothems to reconstruct past climate variability. However, each proxy is influenced by multiple factors, often hampering robust interpretation. Sr isotope ratios (87Sr/86Sr) can provide useful information about water residence time and water mixing in the host rock, as they are not fractionated during calcite precipitation. Laser ablation multi-collector-inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) has rarely been used for determination of Sr isotope signatures in speleothems, as speleothems often do not possess appropriately high concentrations of Sr to facilitate this analysis. Yet the advantages of this approach include rapid data acquisition, higher spatial resolution, larger sample throughput and the absence of chemical treatment prior to analysis. We present LA-MC-ICP-MS Sr isotope data from two speleothems from Morocco (Grotte de Piste) and India (Mawmluh Cave), and we compare linescan and spot analysis ablation techniques along speleothem growth axes. The analytical uncertainty of our LA-MC-ICP-MS Sr data is comparable to studies conducted on other carbonate materials. The results of both ablation techniques are reproducible within analytical error, implying that this technique yields robust results when applied to speleothems. In addition, several comparative measurements of different carbonate reference materials (i.e. MACS-3, JCt-1, JCp-1), including tests with standard bracketing and comparison of the87Sr/86Sr ratios with a nanosecond laser ablation system and a state-of-the-art femtosecond laser ablation system, highlight the robustness of the method.
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