U-Pb Geochronology Using 193 nm Excimer LA-ICP-MS Optimized for In-Situ Accessory Mineral Dating in Thin Sections
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Bibliographic record
Abstract
This article is designed to provide a synopsis of the application of LAICP-MS to U-Pb geochronology of accessory minerals, in standard polished thin sections, using modern 193 nm ArF excimer laser ablation (LA) and quadrupole inductively coupled plasma mass spectrometry (Q-ICP-MS) instrumentation. During about the last five years, Q-ICP-MS manufacturers (e.g. Agilent, Thermo Scientific, Perkin Elmer, Bruker Daltonics) have introduced new instruments or interfaces with higher sensitivity and lower backgrounds, compared to the previous generation of instruments. ArF excimer laser systems built by Resonetics (RESOlution™ M-50 and S-50), NewWave Research (NWR-193™), Photon Machines (Excite™ and Analyte G2™), and Coherent (GeoLas™), have also expanded their capabilities in a relatively short period of time. There has also been a significant leap in software development and laser control, which, when matched with sophisticated offline data processing has increased the overall efficiency of the technique. This article begins with a background section designed to provide the basic bibliography and theory of laser-target interaction for nanosecond and femtosecond lasers. We then describe enhancements in ICP-MS sensitivity, the importance of the laser-ablation cell, smoothing devices, and synchronized hardware and software controls. We also provide examples of how these recent advances have dramatically increased the efficiency (e.g. cost per analysis), precision and accuracy of in situ U-Pb geochronology of accessory minerals using 193 nm excimer LA-ICP-MS. Demonstration datasets are based on the instrumentation installed at the University of New Brunswick, and provide examples of the general capabilities of excimer LA-ICP-MS for detailed in situ U-Pb geochronology. SOMMAIRE Le present article constitue un abrege sur l’application de la spectroscopie de masse a plasma inductif a ablation par laser (ICP-MS) a la geochronologie U-Pb des mineraux accessoires en plaques minces polies normales, en utilisant une version moderne d’un laser excimere ArF d’ablation avec la spectrometrie de masse quadripolaire a plasma a couplage inductif (Q-ICPMS). Au cours des cinq dernieres annees environ, les manufacturiers de Q-ICPMS (Agilent, Thermo Scientific, PerkinElmer, Bruker Daltonics, par exemple) ont presente de nouveaux instruments ou interfaces de meilleure sensibilite et de moindre bruit de fond par rapport aux generations d’instrument precedentes. Les systemes laser excimere ArF construits par Resonetics (RESOlution MC M-50 et S-50), newWave Research (NWR-193 MC ), Photon Machines (Excite MC et AnalyteG2 MC ), et Coherent (GeoLas MC ) ont eux-aussi ameliore leurs capacites dans une periode relativement courte. Il y a egalement eu une avancee significative dans le developpement de logiciels et de controle du laser, ce qui, combine a des traitements de donnees hors ligne sophistiques a augmente l'efficacite globale de la technique. Cet article commence par un rappel de la bibliographie de base et de la theorie de l'interaction laser-cible pour les lasers nanosecondes et femtosecondes. Nous traitons ensuite des ameliorations de sensibilite de l’ICP-MS, de l’importance de la cellule d’ablation par laser, des dispositifs de lissage, et des controles synchronises materiels et logiciels. Nous donnons egalement des exemples de la facon dont ces progres recents ont considerablement augmente l'efficacite (par exemple le cout par analyse), la precision et l'exactitude de la geochronologie U-Pb in-situ sur mineraux accessoires par ICP-MS a ablation par laser excimere 193 nm. Les jeux de donnees de la demonstration qui proviennent de l’instrumentation installee a l’ University of New Brunswick , donnent des exemples des capacites generales de l’ICP-MS a ablation par laser excimere pour l’analyse geochronologique U-Pb in situ .
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it