4.1 Article

New System for Measuring Cosmogenic Ne in Terrestrial and Extra-Terrestrial Rocks

Journal

GEOSCIENCES
Volume 11, Issue 8, Pages -

Publisher

MDPI
DOI: 10.3390/geosciences11080353

Keywords

cosmogenic Ne-21; noble gas isotope; mass spectrometry; neon isotope; Ne-21; Ne dating; Bruderheim chondrite; Imilac pallasite; CREU quartz; cosmogenic nuclides

Funding

  1. SUERC

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Cosmogenic Ne isotopes analysis was conducted using an automated gas extraction and high-throughput mass spectrometer, achieving high precision and repeatability. The system showed great promise for studies with limited material, providing accurate Ne isotope determinations for both terrestrial and extra-terrestrial samples.
Cosmogenic Ne isotopes are used for constraining the timing and rate of cosmological and Earth surface processes. We combined an automated gas extraction (laser) and purification system with a Thermo Fisher ARGUS VI mass spectrometer for high through-put, high precision Ne isotope analysis. For extra-terrestrial material with high cosmogenic Ne concentrations, we used multi-collection on Faraday detectors. Multiple measurements (n = 26) of 1.67 x 10(-8) cm(3) air-derived Ne-20 yielded an uncertainty of 0.32%, and Ne-21/Ne-20 = 0.17% and Ne-22/Ne-20 = 0.09%. We reproduced the isotope composition of cosmogenic Ne in the Bruderheim chondrite and Imilac pallasite in a sub-ten mg sample. For lower Ne amounts that are typical of terrestrial samples, an electron multiplier detector was used in peak jumping mode. Repeated analysis of 3.2 x 10(-11) cm(3) STP Ne-20 from air reproduced Ne-21/Ne-20 and Ne-22/Ne-20 with 1.1% and 0.58%, respectively, and Ne-20 intensity with 1.7% (n = 103) over a 4-month period. Multiple (n = 8) analysis of cosmogenic Ne in CREU-1 quartz yielded 3.25 +/- 0.24 x 10(8) atoms/g (2 s), which overlaps with the global mean value. The repeatability is comparable to the best data reported in the international experiments performed so far on samples that are 2-5x smaller. The ability to make precise Ne isotope determinations in terrestrial and extra-terrestrial samples that are significantly smaller than previously analysed suggests that the new system holds great promise for studies with limited material.

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