Comparing Micadas Gas Source, Direct Carbonate, and Standard Graphite 14 C Determinations of Biogenic Carbonate
Bibliographic Data
| ID | 9241597 |
|---|---|
| Authors | Jordon Bright (0000-0002-8067-6283), Chris Ebert, Carola Flores (0000-0002-6759-6545), Paul G Harnik (0000-0001-6931-9931), John Warren Huntley (0000-0001-9955-8853), Michał Kowalewski (0000-0002-8575-4711), Roger W Portell (0000-0002-3306-2115), Michael Retelle, Edward A G Schuur (0000-0002-1096-2436), Darrell S Kaufman (0000-0002-7572-1414) |
| Year | 2024 |
| Volume | 66 |
| Issue | 2 |
| Pages | 295-305 |
| Publication date | 2024-04-01 |
| Open Access | Yes |
| Type | ARTICLE |
| Venue | Radiocarbon (JOURNAL) |
| Journal identifiers | ISSN: 0033-8222 • E-ISSN: 1945-5755 |
| Publisher | Cambridge University Press (CUP) (PUBLISHER) |
| DOI | 10.1017/rdc.2024.45 |
| OpenAlex | W4396242111 |
| Language | EN |
| Citations received | 1 |
| References cited | 44 |
Northern Arizona University, Flagstaff, Arizona, USA, recently installed a MIni CArbon DAting System (MICADAS) with a gas interface system (GIS) for determining the 14 C content of CO 2 gas released by the acid dissolution of biogenic carbonates. We compare 48 paired graphite, GIS, and direct carbonate 14 C determinations of individual mollusk shells and echinoid tests. GIS sample sizes ranged between 0.5 and 1.5 mg and span 0.1 to 45.1 ka BP (n = 42). A reduced major axis regression shows a strong relationship between GIS and graphite percent Modern Carbon (pMC) values (m = 1.011; 95% CI [0.997–1.023], R 2 = 0.999) that is superior to the relationship between the direct carbonate and graphite values (m = 0.978; 95% CI [0.959-0.999], R 2 = 0.997). Sixty percent of GIS pMC values are within ±0.5 pMC of their graphite counterparts, compared to 26% of direct carbonate pMC values. The precision of GIS analyses is approximately ±70 14 C yrs to 6.5 ka BP and decreases to approximately ±130 14 C yrs at 12.5 ka BP. This precision is on par with direct carbonate and is approximately five times larger than for graphite. Six Plio-Pleistocene mollusk and echinoid samples yield finite ages when analyzed as direct carbonate but yield non-finite ages when analyzed as graphite or as GIS. Our results show that GIS 14 C dating of biogenic carbonates is preferable to direct carbonate 14 C dating and is an efficient alternative to standard graphite 14 C dating when the precision of graphite 14 C dating is not required
Carbon fibers · Carbonate · Composite material · Graphite · Mineralogy · Radiocarbon dating · Chemistry · Geology and Paleoclimatology Research · Isotope Analysis in Ecology · Materials Science · Paleontology and Stratigraphy of Fossils · Environmental Chemistry · Geology · Paleontology
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| Citations per year | 1 |
|---|---|
| Citation span | 2025 - 2025 (1) |
| Highly cited | No |