LA‐ICP‐MS/MS Single‐Spot Rb‐Sr Dating

نویسندگان

چکیده

Due to developments in reaction cell technologies, it is now possible collect large 87 Rb/ 86 Sr and Sr/ data sets using LA‐ICP‐MS/MS. Until now, LA‐ICP‐MS/MS Rb‐Sr ages were constrained conventional isochrons on a contiguous set of data. In this contribution, we present straightforward procedure how measure, calculate validate from individual laser spots even detrital grains devoid context. This approach does not only allow provenance studies micas, but also furthermore opens the opportunity produce age maps with unprecedented spatial resolution, both for zoned single crystals targeting different textural domains. The main challenge calculating single‐spot estimation initial composition, if cannot be through analysis paragenetic phase. case, propose use range geologically relevant compositions rather than one fixed value: (1) 0.703 ± 0.003 (for mantle derived magmatic rocks), (2) 0.715 0.015 evolved rocks) (3) 0.730 0.030 crustal rocks). Modelling shows that ratio targeted material delineates accuracy precision ages. If measured isotopic composition sufficiently radiogenic [ > 1.0 scenario 4.5 (3)], calculated its uncertainty are significantly influenced by composition. Using Mica‐Mg as primary reference material, dating was tested biotite (Mount Dromedary, La Posta, McClure Mountain), muscovite (Högsbo) nano‐powder tablet (Mica‐Fe) further secondary materials geochronology.

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ژورنال

عنوان ژورنال: Geostandards and Geoanalytical Research

سال: 2022

ISSN: ['1639-4488', '1751-908X']

DOI: https://doi.org/10.1111/ggr.12414