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New System for Measuring Cosmogenic Ne in Terrestrial and Extra-Terrestrial Rocks
| Content Provider | MDPI |
|---|---|
| Author | Domokos, Györe Nicola, Luigia Di Currie, David Stuart, Finlay M. |
| Copyright Year | 2021 |
| Description | 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 × $10^{−8}$ $cm^{3}$ air-derived$ ^{20}$Ne yielded an uncertainty of 0.32%, and$ ^{21}Ne/^{20}$Ne = 0.17% and$ ^{22}Ne/^{20}$Ne = 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 × $10^{−11}$ $cm^{3}$ STP$ ^{20}$Ne from air reproduced$ ^{21}Ne/^{20}$Ne and$ ^{22}Ne/^{20}$Ne with 1.1% and 0.58%, respectively, and$ ^{20}$Ne 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 × $10^{8}$ 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 2–5× 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. |
| Starting Page | 353 |
| e-ISSN | 20763263 |
| DOI | 10.3390/geosciences11080353 |
| Journal | Geosciences |
| Issue Number | 8 |
| Volume Number | 11 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-08-23 |
| Access Restriction | Open |
| Subject Keyword | Geosciences Geochemistry and Geophysics Cosmogenic 21ne Noble Gas Isotope Mass Spectrometry Neon Isotope 21ne Ne Dating Bruderheim Chondrite Imilac Pallasite Creu Quartz Cosmogenic Nuclides |
| Content Type | Text |
| Resource Type | Article |
