| Autor: |
Luigi Selli, G. Simboli, Alberto Castellarin, P.L. Rossi, F. Lucchini |
| Rok vydání: |
1988 |
| Předmět: |
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| Zdroj: |
Tectonophysics. 146:79-89 |
| ISSN: |
0040-1951 |
| Popis: |
The geodynamic meaning of the Middle Triassic magmatic and tectonic events in the Southern Alps is still uncertain. The main problem is the significance of the compressional tectonic structures recognized in the central Dolomites. In fact these structures are incompatible with the extensional geodynamic interpretation (crustal rifting) assumed by several authors. Therefore the compressional tectonic elements of the Dolomites have been mostly ignored or not seriously taken into account, or considered as local phenomena due to the volcanic-tectonic interplay. Other more modern interpretations are founded on regional transcurrent and/or transpressive tectonics. Recent discovery of a Middle Triassic thrust system located in the Piave River area (some tens of kilometres east of the central Dolomites) lends more credence to the compressional Middle Triassic event. The magmatic series of volcanic and plutonic Middle Triassic rocks display an “orogenic” character, with typical calc-alkaline trends recognized across the whole Southern Alps as well as in the Dinaric and Hellenic domains. Such a character is rather uncommon in the crustal evolution by rifting but is more in accord with a compressional geodynamic setting. Furthermore the time-space distribution of the South Alpine magmatic rocks, coupled with their petrochemical affinity, are close to the modern volcanic arcs. Nevertheless the general geodynamic context of the Southern Alps, owing to their pronounced ensialic character, does not fit the oceanic model. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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