Биостратиграфия славгородского горизонта (сантон нижний кампан) юго-востока Западной Сибири
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Notice bibliographique
Résumé
The paper considers recent data of the investigation on foraminifera and biostratigraphy of the Slavgorodskian Horizon dated to the Santonian Early Campanian. Eighteen core samples were analysed from the borehole ZN-4 section (the vicinity of town Seversk) in the southeast of Western Siberia. The foraminiferal assemblages were encountered at three stratigraphic levels: the Lower Santonian beds with the Haplophragmoides tumidus Assemblage (the Ammobaculites dignus Pseudoclavulina admota Zone) the Upper Santonian beds with the Ammomarginulina crispa Assemblage (the Cribrostomoides exploratus Ammomarginulina crispa Zone) and the Lower Campanian beds with the Recurvoides magnificus Assemblage (the Bathysiphon vitta Recurvoides magnificus Zone). Three palaeontological plates illustrate the main species of agglutinated quartz-siliceous and secreted-calcareous foraminifera. The Early Santonian assemblage encountered here is dominated by species of the Haplophragmoididae Family, of which index-species Haplophragmoides tumidus was established for these beds. In the middle beds of the Slavgorodskian Horizon, the assemblage is dominated by coarse-grained agglutinated tests and the index-species Ammomarginulina crispa among them. In the central district this index-species was established in the Upper Santonian beds along with the other characteristic species Cribrostomoides exploratus Podobina that is missing in the borehole ZN-4 section. In the upper beds of the Slavgorodskian Horizon, the systematic composition of the assemblage is significantly renewed, and the Recurvoides magnificus Podobina Species known for the Lower Campanian appears along with the species of agglutinated tests met previously. The species of the secreted-calcareous tests also occur, that are characteristic for this part of the section and migrated here from the southern (Kazakhstan) province. The systematic composition of large agglutinated coarse-grained tests is similar to that from the central district, where the Arctic Regions influenced the relatively cold-water basin of Western Siberia. The significant similarity of these West-Siberian foraminifera is also observed with the forms from Canada and Northern Alaska assigned to the Arctic Palaeozoogeographic Realm. Southern immigrants entering the assemblage commonly as pseudomorphs and rare secreted-agglutinated tests are similar in taxonomy to the species from Kazakhstan and East-European provinces of the Boreal-Atlantic Realm. The mixed taxonomic composition of foraminifera from various provinces enabled the Santonian Early Campanian age of the Slavgorodskian Horizon to be established from these two ways (northern and southern). The shallow-water coastal environmental conditions for the studied foraminiferal tests left their imprints on their aspects and systematic composition. In the borehole ZN-4 section, the Santonian Lower Campanian beds containing varied index-species are correlatable with the widespread foraminiferal zones. The lithologo-microfaunal characterization of the studied section beds and their correlatability with the established foraminiferal zones is presented in the table.
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.
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 | 0,001 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,002 | 0,001 |
| Méta-épidémiologie (sens large) | 0,002 | 0,001 |
| Bibliométrie | 0,001 | 0,002 |
| Études des sciences et des technologies | 0,002 | 0,002 |
| Communication savante | 0,000 | 0,002 |
| Science ouverte | 0,002 | 0,001 |
| Intégrité de la recherche | 0,001 | 0,002 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,039 | 0,014 |
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 découle