Structural inheritance and evolving rift kinematics in transform and oblique rift systems: A comparison of global examples
Notice bibliographique
Résumé
A spectrum of rift types from orthogonal, through oblique to pure transform-type systems have been documented. In addition, it is well-established that during rift evolution transition between these kinematic regimes may occur. The effects of obliquity are extensive, often leading to distinctive structural settings dominated by transtensional and transpressional processes. The complexity of these settings, as well as their global prevalence, emphasises the need for better understanding, so that the role of oblique rifts and transforms in larger-scale plate tectonics can be fully appreciated. The development of oblique rifts and transforms is influenced by a number of interrelated factors including: 1) oblique crustal and mantle inheritance, 2) a reduced force required for plastic yielding, 3) changes in far-field forces, 4) asthenospheric dynamics, and 4) grain size changes in the lower crust and mantle. However, although their development is controlled by this array of processes, it is known that the influence of oblique crustal and mantle inheritance, as well as changes in far-field forces is substantial. Yet, the relative importance, and prevalence, of these two factors amongst rift systems globally is insufficient. As such, the aim of this study is to determine to what extent these two processes prevail. Structural inheritance refers to heterogeneities produced by previous geological processes that proceed to influence subsequent geological events. This process plays a substantial role in oblique rift and transform development at both the crustal and mantle scale. Specifically, large-scale mantle structures may localise crustal deformation, whilst reactivation of discrete structures in the pre-rift crystalline basement can influence the geometry and kinematics of rift basins and margins. On the other hand, changes in the orientation and magnitude of far-field forces mean that as a rift proceeds from inception to possible breakup, the kinematic regime may evolve such that the orientation of extension with respect to the rift boundary is spatiotemporally variable. Such changes in rift kinematics allow structures established under one kinematic regime to be subsequently reactivated, overprinting multiple rift episodes, whilst variable extension magnitude may introduce further complexities. To better understand these processes we systematically compare the structural and tectonic evolution of several oblique rifts and transform margins, which were chosen to represent a diversity of rift types. Specifically, we compare: 1) the Davis Strait, 2) the Bay of Biscay 3) the Gulf of California, 4) the Red Sea, and 5) the East African margin. This is achieved by extracting rift velocity and extension directions from published plate tectonic models using GPlates, which are then compared with model results, as well as geological and geophysical observations. Preliminary results indicate that most oblique rifts and transforms express a strong influence of structural inheritance and a substantial change in kinematics during their evolution, emphasising the importance of these factors in oblique rift development.
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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 | 0,000 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,003 | 0,004 |
| Études des sciences et des technologies | 0,000 | 0,001 |
| Communication savante | 0,001 | 0,001 |
| Science ouverte | 0,000 | 0,001 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,003 | 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 source (Gemma direct ou Codex distillé), 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 ».