An optimized chromatography method and MC-ICP-MS technique for apatite Lu–Hf geochronology

文献情報

出版日 2023-10-23

DOI 10.1039/D3JA00203A

インパクトファクター 4.023

著者

Chao Zhang, Tsai-Wei Chen, Jeffrey D. Vervoort

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要旨

Apatite is a common accessory mineral found in almost all igneous, metamorphic, and clastic sedimentary rocks. It contains concentrations of lutetium and hafnium amenable to dating by the Lu–Hf isochron method. However, the application of this method has been hampered by chemical difficulties associated with the extraction of a clean Hf concentrate from apatite. A novel method of efficient chemical separation utilizing Ln and DGA-normal extraction chromatography columns has been developed for precise isotope analysis and is presented in this study. The routine analysis of sub-ng amounts of Hf maintained high yield close to 100%. The purification of Hf with a DGA-normal chromatography column effectively eliminated the interfering elements (Yb, Lu, and W), typically resulting in less than 1 pg of Lu in the analyzed apatite Hf solution. Apatite Lu–Hf isotope compositions of Otter Lake, Bancroft, and Durango apatites were determined using the reported methodology and yielded isochron ages of 1047.6 ± 3.4 Ma, 1092 ± 17 Ma, and 31.1 ± 1.1 Ma, respectively. All apatite Lu–Hf isochrons are characterized by phenomenally high apatite 176Lu/177Hf and 176Hf/177Hf ratios. Such apatite Lu–Hf isochrons are shown to be not significantly dependent on the initial isotopic composition in determining accurate and precise ages, allowing for anchoring the low end of the isochron with an estimated isotopic composition.

掲載誌

Journal of Analytical Atomic Spectrometry

CiteScore: 6.2

自己引用率: 25.8%

年間論文数: 254

The Journal of Analytical Atomic Spectrometry (JAAS) is the central journal for publishing innovative research on fundamentals, instrumentation, and methods in the determination, speciation and isotopic analysis of (trace) elements within all fields of application. This includes, but is not restricted to, the most recent progress, developments and achievements in all forms of atomic and elemental detection, isotope ratio determination, molecular analysis, plasma-based analysis and X-ray techniques. The journal welcomes full papers, communications, technical notes, critical and tutorial review articles, editorials, and comments, in addition to the Atomic Spectrometry Updates (ASU) literature reviews that are prepared by an expert panel. Submissions are welcome in the following areas, but note this list reflects the current scope and authors are strongly encouraged to contact the Editorial team if they believe that their work offers potentially new and emerging research relevant to the journal remit: Fundamental studies in the following. New and existing sources for atomic emission, absorption, fluorescence and mass spectrometry and those that provide both atomic and molecular information Sample introduction techniques for solids, liquids, gases Improvements in sensitivity, selectivity, precision, accuracy and/or robustness Isotope ratio measurements, including techniques for improving precision and mass bias correction Single channel and multichannel simultaneous detection systems Chemometrics, statistics, calibration techniques and internal standardisation Theoretical and numerical modelling of fundamental processes related to all of the above methodologies Novel or improved methodologies in areas of application including, but not limited to the following. Biosciences, including elemental, speciation and isotopic analysis in biological systems, immunoassays based on metal-labeled antibodies, bio-imaging, and nanoparticle toxicology Geochemistry Environmental science Materials science, including engineered nanoparticles and quantum dots Metrology, including reference materials Forensic analysis Food and agricultural sciences Energy Archaeometry Molecular analysis. Molecular sources for elemental and isotopic analysis Atomic sources for molecular analysis Atomic and molecular techniques simultaneously used for complementary chemical information All contributions are judged on originality and quality of scientific content, and appropriateness of length to content of new science.