Post-orogenic extension in Kos Island (Greece): geodynamic implications
Bibliographic record
Abstract
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.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".