Mineralogical Association of Canada, Short Course
Notice bibliographique
Résumé
A state-of-the-art mobile Apatite Fission Track (AFT) laboratory is operational at Diné College on the Navajo Nation. For outreach to local Junior High School students, AFT analysis was applied to samples related to a Tertiary dike intruded into Lower Jurassic Navajo Sandstone, near Boundary Butte, southern Utah, Navajo Nation. AFTs in the dike and adjacent reset sandstone constrain post-intrusion time-temperature (t-T) paths. AFTs in one nearby sample constrain heating due to dike intrusion to between 275-325°C (assuming 1-2 months duration). AFTs far from the dike constrain pre-intrusion and post-intrusion t-T paths. Ms. White will provide several Chinle Junior High School 7th Grade students the AFT-based t-T histories summarized above and an Excel workbook containing Visual Basic source code that solves the infinite sheet heat flow equation (Carslaw and Jaeger's (1959, Equation 9, page 56). The students will be tasked with matching the AFT-based and heat-flow-equation-based t-T histories. Student and professional experiences with this project are being documented and will be polled. Lessons for students will reflect the Arizona Beyond Textbooks standards as an afterschool extracurricular project. The ultimate objective of this project is to demonstrate to these curious students links between AFT sciences and the rich natural history of the Navajo Nation. Fieldwork on the Navajo Nation was conducted under a permit from the Navajo Nation Minerals Department. Any person(s) wishing to conduct geologic investigations on the Navajo Nation must first apply for and receive a permit from the Navajo Nation Minerals Department, P.O. Box 1910, Window Rock, Arizona 86515, USA, and Telephone No. +1 (928) 871-6587. Junior High School Science Club Project Due to COVID-19 restrictions, Ms. White's Science Club at Chinle Junior High School will begin this project in September 2023. This AFT study is intended to engage students with Science, Technology, Engineering, and Mathematics subjects. The students will receive background information that place the samples in their geological context. A second field trip to the sample site is planned for October 2023 so the students can view first-hand and measure field relations (dike width, distance of sandstone samples to the dike) and to collect additional rocks for further analysis (sandstone samples CJHS-3A and CJHS-3B). Students will receive scaffolded information about apatite fission track data and how time-temperature histories are predicted using those data. Additionally, students will receive an Excel file (Figure 2) with Visual Basic code that solves Carslaw and Jaeger's infinite sheet analysis equation (1959; Equation 9, page 56). The students will be tasked with learning and modifying this Visual Basic code and with matching the AFT-based time-temperature predictions. Lastly, students will receive ongoing guidance by experts whilst sharing enthusiasm about the fields of geology and geological heat flow. The ultimate objective of this project is to help curious students make the link between state-of-the-art data gathered for this project and the sciences used with the rich natural history of the Navajo Nation. It is hoped that the students enter this project in a Science Fair competition during Spring 2024. Student and professional experiences with this project are being documented and will be polled. Lessons for students will reflect the Arizona Beyond Textbooks standards as an afterschool extracurricular project. Table 1. AFT data summary (analyst Ray Donelick). Figure 3. Colored by apatite UPb age (left), REE profiles for 381 standard apatite grains (center) and 396 apatite grains (right) from this study.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,003 |
| Méta-épidémiologie (sens strict) | 0,001 | 0,001 |
| Méta-épidémiologie (sens large) | 0,001 | 0,000 |
| Bibliométrie | 0,003 | 0,005 |
| Études des sciences et des technologies | 0,005 | 0,001 |
| Communication savante | 0,004 | 0,002 |
| Science ouverte | 0,002 | 0,001 |
| Intégrité de la recherche | 0,001 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,558 | 0,279 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; l’étiquette directe de Gemma et le classifieur distillé Codex s’accordent sur ce qui est montré ici.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».