التفاصيل البيبلوغرافية
| العنوان: |
Technical note: RA138 Calcite U-Pb LA-ICP-MS primary reference material. |
| المؤلفون: |
Guillong, Marcel, Samankassou, Elias, Müller, Inigo A., Szymanowski, Dawid, Looser, Nathan, Tavazzani, Lorenzo, Merino-Tomé, Óscar, Bahamonde, Juan R., Buret, Yannick, Ovtcharova, Maria |
| المصدر: |
Geochronology; 3/6/2024, p1-16, 16p |
| مصطلحات موضوعية: |
LASER ablation inductively coupled plasma mass spectrometry, REFERENCE sources, CALCITE, URANIUM-lead dating |
| مصطلحات جغرافية: |
SPAIN |
| مستخلص: |
A promising primary reference material for U-Pb LA-ICP-MS carbonate dating is analysed and reported here. The new RM is a botryoidal cement (C1) from sample RA138. The sample was collected in outcrop strata of mid-Carboniferous (Uppermost Mississippian, upper Serpukhovian) in northern Spain near La Robla, and multiple aliquots have been meticulously prepared for distribution. The RA138 is characterised by variable U/Pb ratios (from ~1 to ~19) and a relatively high and homogeneous U content (~4 ppm). This material exhibits a low age uncertainty (0.2 %, 2s; unanchored, ID-TIMS), allowing for the establishment of a well-defined isochron, particularly when anchored to the initial Pb ratio using LA-ICP-MS. ID-TIMS analyses of micro drilled C1 cement (17 sub-samples) produce a lower intercept age of 321.99 ± 0.65 Ma, an initial 207Pb/206Pb ratio of 0.8495 ± 0.0065, and a Mean Square of Weighted Deviations (MSWD) of 5.1. The systematic uncertainty of 1.5 % observed in repeated LA-ICP-MS analyses challenges previous estimations of 2–2.5 % based on repeated analyses of ASH-15D and JT using WC-1 as primary reference material, underscoring the precision and reliability of RA138 for U-Pb dating applications. [ABSTRACT FROM AUTHOR] |
|
Copyright of Geochronology is the property of Copernicus Gesellschaft mbH and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |
Full Text Finder