Interpreting and reporting 40Ar/39Ar geochronologic data
Interpreting and reporting 40Ar/39Ar geochronologic data
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DOI：
10.1130/b35560.1
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发表时间：
2020-07
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通讯作者：
A. Schaen;B. Jicha;K. Hodges;P. Vermeesch;M. Stelten;C. Mercer;D. Phillips;T. Rivera;F. Jourdan;E. Matchan;S. Hemming;L. Morgan;S. Kelley;W. Cassata;M. Heizler;P. Vasconcelos;J. Benowitz;A. Koppers;D. Mark;E. Niespolo;C. Sprain;W. Hames;K. Kuiper;B. Turrin;P. Renne;J. Ross;S. Nomade;H. Guillou;L. Webb;B. Cohen;A. Calvert;N. Joyce;M. Ganerød;J. Wijbrans;O. Ishizuka;Huaiyu He;Adán Ramirez;J. Pfänder;M. López‐Martínez;H. Qiu;B. Singer
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作者：
A. Schaen;B. Jicha;K. Hodges;P. Vermeesch;M. Stelten;C. Mercer;D. Phillips;T. Rivera;F. Jourdan;E. Matchan;S. Hemming;L. Morgan;S. Kelley;W. Cassata;M. Heizler;P. Vasconcelos;J. Benowitz;A. Koppers;D. Mark;E. Niespolo;C. Sprain;W. Hames;K. Kuiper;B. Turrin;P. Renne;J. Ross;S. Nomade;H. Guillou;L. Webb;B. Cohen;A. Calvert;N. Joyce;M. Ganerød;J. Wijbrans;O. Ishizuka;Huaiyu He;Adán Ramirez;J. Pfänder;M. López‐Martínez;H. Qiu;B. Singer
40 Ar/39 Ar定年法是最通用的地质年代计之一，有可能对从地球形成到历史领域的各种含钾物质进行定年。使用现代稀有气体质谱仪的测量现在产生40 Ar/39 Ar日期，分析不确定性为10.1%，从而为广泛的地质和外星过程提供精确的时间限制。对越来越小的子样品的分析揭示了许多材料的年龄分散，包括一些用作中子注量监测器的矿物。因此，解释策略正在演变，以解决从单一样本中观察到的日期分散问题。此外，从测量的“日期”或一组日期推断地质上有意义的“年龄”取决于所处理的地质问题和与每组数据相关的重要假设。我们强调的要求，将更好地约束解释40 Ar/39 Ar数据集，包括那些与单晶熔融分析，增量加热实验，并在原位分析微取样域的附带信息。为了确保公布的结果的实用性和可行性，我们强调以前的建议，报告40 Ar/39 Ar数据和相关的基本元数据，与修订，数据符合不断发展的标准，被发现，访问，互操作，可重复使用（FAIR）的人类和计算机。我们的例子为40 Ar/39 Ar年代的介绍和解释提供了指导，以最大限度地提高其跨学科的使用，再现性和寿命。
The 40Ar/39Ar dating method is among the most versatile of geochronometers, having the potential to date a broad variety of K-bearing materials spanning from the time of Earth’s formation into the historical realm. Measurements using modern noble-gas mass spectrometers are now producing 40Ar/39Ar dates with analytical uncertainties of ∼0.1%, thereby providing precise time constraints for a wide range of geologic and extraterrestrial processes. Analyses of increasingly smaller subsamples have revealed age dispersion in many materials, including some minerals used as neutron fluence monitors. Accordingly, interpretive strategies are evolving to address observed dispersion in dates from a single sample. Moreover, inferring a geologically meaningful “age” from a measured “date” or set of dates is dependent on the geological problem being addressed and the salient assumptions associated with each set of data. We highlight requirements for collateral information that will better constrain the interpretation of 40Ar/39Ar data sets, including those associated with single-crystal fusion analyses, incremental heating experiments, and in situ analyses of microsampled domains. To ensure the utility and viability of published results, we emphasize previous recommendations for reporting 40Ar/39Ar data and the related essential metadata, with the amendment that data conform to evolving standards of being findable, accessible, interoperable, and reusable (FAIR) by both humans and computers. Our examples provide guidance for the presentation and interpretation of 40Ar/39Ar dates to maximize their interdisciplinary usage, reproducibility, and longevity.