The depositional and diagenetic history of the Permian Quartermaster Group of western Kansas
Notice bibliographique
Résumé
Permo-Triassic red beds and evaporites can be found in a variety of locations around the world. Largely deposited once the supercontinent Pangea formed, many of these units have historically been interpreted as marine to marginal marine deposits due to their association with evaporites. Evaporites, however, can also form in continental settings. Recent studies of red beds and evaporites within the Leonardian-Guadalupian Nippewalla Group of Kansas suggest some red beds and evaporites were deposited in acid saline lakes and associated environments. The middle to late Permian Quartermaster Group, which overlies the Nippewalla Group, has not been as extensively studied. The main goal of this thesis was to determine the depositional and diagenetic history of the Quartermaster Group of Kansas.;This research focused on the Whitehorse Sandstone, Day Creek Dolomite, and Big Basin Formation of the Quartermaster Group as observed in the Amoco Rebecca K. Bounds core no. 1 from Greeley County, west-central Kansas. Petrography and mineralogical identification were used to characterize the depositional and diagenetic features of these rocks. Field observations from south-central Kansas (Clark and Barber Counties) provided supplementary data.;Sedimentary features observed in the Quartermaster Group suggest the Whitehorse Sandstone, Day Creek Dolomite, and Big Basin Formation were deposited in continental settings. The Whitehorse Sandstone consists of red sandstone, siltstone, and mudstone with observable ped structures, root features, ripple cross-stratification, mud drapes, mudcracks, and soil slickensides. These features suggest deposition in mudflats and fluctuating water tables in adjacent soils. The Day Creek Dolomite consists of bedded gypsum/anhydrite and finely laminated red siltstones. Ripple cross-stratification, mudcracks, and planar laminae observed in bedded gypsum/anhydrite indicate deposition in ephemeral saline lake environments while ripple cross-stratification, mud drapes, soil slickensides, and root features in red siltstones indicate mudflats and soils. The Big Basin Formation consists of dark red sandstone, siltstone, and mudstone characterized by soft sediment deformation, ripple cross-stratification, mudcracks, and soil slickensides. These features suggest deposition in mudflats and the development of paleosols. In general, early and late diagenetic features observed within the Quartermaster Group suggest substantial influence from wetting and drying processes at or near the surface.;Evidence for acidity in the Quartermaster Group is based on suspect to problematic criteria. Acid saline lake deposition is postulated from indirect criteria such as unusual yellow hues observed in halite and other evaporites within bedded gypsum/anhydrite layers of the Day Creek Dolomite. Additionally, the absence of carbonates, abundance of red beds, and similarities to the underlying
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 distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
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; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».