Post-orogenic extension in Kos Island (Greece): geodynamic implications
Notice bibliographique
Résumé
Despite significant differences in the early tectonic histories, rocks in the eastern Mediterranean region partly share a common Cenozoic history characterized by several tectonic events including subduction, collision and extension. The correlations between the Aegean domain and the Menderes Massif have often been proposed, but few studies have considered the geology of the central Dodecanese Islands, which are located at the transition between the Aegean and Anatolian plates. In this study, we focus on the poorly studied island of Kos and investigate the tectonic history of the central Dodecanese Islands, as well as the general correlation with the Aegean and western Anatolian. Raman Spectroscopy of Carbonaceous Material (RSCM) analyses combined with white micas 40Ar/39Ar and zircon (U-Th)/He geochronology were carried out to determine peak temperatures and the timing tectonothermal events recorded by the various units. Three different tectonic units were identified from bottom to top: (1) the Paleozoic Unit overlain by the Permo-Triassic Wildflysch Unit in which primary sedimentary structures are well preserved. The units consist of low-grade meta-sediments including bedded meta-sandstones, meta-arkosic sandstones, meta-pelites and subordinate impure marble layers, bedded meta-chert with chaotic polymictic conglomerates containing huge blocks of metavolcanites, dolomitic limestones and marbles. Tmax of a graphitic phyllonite located in the Wildflysch Unit is 299 ± 14°C, confirming low-grade metamorphism. (2) The Marina Basement Unit consists of coarse-grained pure marbles, impure marbles with metachert layers, garnets, andalusite-mica schists, and quartzites, which was thrusted onto the Paleozoic and Wildflysch units with top-to-N kinematics during the Paleocene. Tmax from the Marina Basement are around 565 ± 35°C, suggesting a temperature difference of over 250°C with the previous units. (3) The Marina Cover Unit consists of unmetamorphosed dolomites, dolomitic limestones, and micritic limestones. Rocks of this unit are only preserved as isolated klippen juxtaposed onto the metasediments of the Paleozoic/Wildflysch Unit along the Oligocene Kos Detachment that exhibits an overall top-to-SSE shear sense. The western part of the Paleozoic Unit was intruded by a c. 10 Ma quartz-bearing biotite-hornblende monzonite intrusion which cooled until 5 Ma. The metamorphic aureole is a few 100 meters wide, which is similar in size to metamorphic aureole of other Miocene granitoids in the Cyclades. N-S extension is recorded after the intrusion as testified by cataclasites and W-E striking high-angle faults that control the current geomorphology of the island. At the regional scale, we propose that Oligocene extension occurred along the top-S Kos-Kalymnos Detachment System, and was localized in the Pelagonian Unit. Further west and a few million years later, the deformation started to propagate to deeper structural levels within the base of the Pelagonian, affecting the rocks of the Cycladic Blueschist Unit and favoring their relatively fast exhumation. Conversely, deformation in southwestern Turkey appears to record only compressional tectonics. Here, the Lycian nappes – the Turkish equivalent of the Pelagonian – were thrust to the SE upon the Menderes Massif and the Bey Daglari platform. This implies that the subduction dynamics differ from east to west in the eastern Mediterranean region.
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 | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,001 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,001 |
| Communication savante | 0,001 | 0,000 |
| Science ouverte | 0,000 | 0,001 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 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 ».