Rapid U‐Pb Geochronology by Laser Ablation Multi‐Collector ICP‐MS

Rapid U‐Pb Geochronology by Laser Ablation Multi‐Collector ICP‐MS
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通过激光烧蚀多接收器 ICP-MS 进行快速 U-Pb 地质年代学

DOI:
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发表时间:
2020
影响因子:
3.8
通讯作者:
M. Pecha
M. Pecha
中科院分区:
地球科学2区
文献类型:
--
作者:
K. Sundell;G. Gehrels;M. Pecha

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碎屑锆石 (DZ) U-Pb 激光烧蚀电感耦合等离子体质谱 (LA-ICP-MS) 彻底改变了地质学家解决许多地球科学问题的方式。尽管最近的研究重点是快速样品通量,但采集率仅限于 100-300 次分析 h−1。我们提出了一种通过多接收器 LA-ICP-MS 以 120、300、600 和 1200 次分析 h−1(每次分析 30、12、6 和 3 s)的速率获取锆石 U-Pb 日期的方法。我们通过分析 12 种日期从 ~ 3465 到 ~ 28 Ma 的锆石标准物质来证明该方法的有效性。高精度日期的平均偏移量以更快的速度从 0.9% 增加到 1.1%;平均随机 1s 不确定性从 0.6% 增加到 1.3%。我们在先前通过大 n DZ 地质年代学表征的砂岩样本上测试了这种新方法。定量比较显示,超过 300 个日期的年龄分布之间的对应性有所增加。这种新方法为 DZ 地质年代学带来了希望,因为 (a) 它不需要对硬件进行重大改变,而是需要对软件进行修改; (b)它产生了非常适合定量分析和最大沉积年龄计算的稳健年龄分布; (c) 准确度和测量不确定度仅略有牺牲; (d) 研究人员在时间投入和分析成本方面的负担减轻。
Detrital zircon (DZ) U‐Pb laser ablation‐inductively coupled plasma‐mass spectrometry (LA‐ICP‐MS) has revolutionised the way geologists approach many Earth science questions. Although recent research has focused on rapid sample throughput, acquisition rates are limited to 100–300 analyses h−1. We present a method to acquire zircon U‐Pb dates at rates of 120, 300, 600 and 1200 analyses h−1 (30, 12, 6 and 3 s per analysis) by multi‐collector LA‐ICP‐MS. We demonstrate the efficacy of this method by analysing twelve zircon reference materials with dates from ~ 3465 to ~ 28 Ma. Mean offset from high‐precision dates increases with faster rates from 0.9% to 1.1%; mean random 1s uncertainty increases from 0.6% to 1.3%. We tested this new method on a sandstone sample previously characterised by large‐n DZ geochronology. Quantitative comparison shows increased correspondence among age distributions comprising > 300 dates. This new method holds promise for DZ geochronology because (a) it requires no major changes to hardware, but rather modifications to software; (b) it yields robust age distributions well‐suited for quantitative analysis and maximum depositional age calculations; (c) there is only a minor sacrifice of accuracy and measurement uncertainty; and (d) there is less burden to researchers in terms of time investment and analytical cost.
DOI: 10.1016/j.epsl.2019.01.044
发表时间: 2019-04
影响因子: 5.3
作者:
J. Saylor;K. Sundell;G. Sharman
通讯作者: J. Saylor;K. Sundell;G. Sharman
DOI: 10.1130/g32945.1
发表时间: 2012-10-01
期刊: GEOLOGY
影响因子: 5.8
作者:
Cawood, P. A.;Hawkesworth, C. J.;Dhuime, B.
通讯作者: Dhuime, B.