Kinematic History and Tectonic Evolution of the Amerasian Basin: Investigating Palaeo-Plate Boundaries around the Chukchi Borderlands - Abstract
Notice bibliographique
Résumé
The Arctic Ocean has been influenced by both the Atlantic and Pacific Ocean plate systems during its tectonic history. The complex multi-stage opening of the basin is only partially understood, in part, due to the difficulty of utilizing traditional geologic and geophysical oceanographic techniques in ice-covered waters. While the kinematic development of the Eurasian Basin is well-understood to be the northernmost extension of the Mid-Atlantic Ridge, the history of the morphologically complex Amerasian Basin may be due to multiple events, significantly complicating interpretation of its history. Any detailed model for the opening of the Amerasian Basin should look for structures that would accommodate spreading, as well as seek to explain the tectonic mechanisms that drove the basin's development. Tholeiitic flood basalts of similar ages have been observed along the margins of the Arctic Ocean and are thought to represent a Large Igneous Province. Since LIPs are usually associated with continental rifting, a successful model for the basin might be based on reconstructing the geometry of the Cretaceous High Arctic Large Igneous Province and its associated radiating dike swarms. Detailed models should also consider pre-existing zones of weakness such as the suture zone and deformation front of the ancient Caledonides. These may underlie the shelf sediments and extend northward from the Eurasian Arctic Margin across the Barents Shelf coinciding with the bend in the Lomonosov Ridge. This would facilitate the development of transform faults on either side of the Mendeleev Ridge to accommodate spreading in the newly forming Amerasian Basin, as well as creating a rectangular pull-apart basin between the Mendeleev and Lomonosov Ridges. We propose a revised plate model for the development of the Amerasian Basin. This model invokes a triple junction in the central Canada Basin. A magmatic source, localized under the Alpha Ridge generated the radiating dike swarms and tholeiitic flood basalts of similar Early Cretaceous age found on the DeLong Islands, Svalbard, Franz Joseph Land, Greenland, Sverdrup Basin and, possibly, the Alpha and Mendeleev Ridges that accompanied the onset of rifting in the Amerasia Basin. This resulted in a dilatational opening of the Canada Basin, the reactivation of previous structural trends, and the migration of the southern edges of the northeastern Siberian shelf along large right lateral transform faults that allowed crustal escape toward the Pacific subduction zone. Bathymetry, aeromagnetic and gravity data also support a complimentary zone of left lateral transform motion along the northern Alaska margin and southern edge of the Chukchi Borderlands which would also have accommodated spreading and southerly escape.
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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 | 0,001 | 0,001 |
| 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 ».