Middle Jurassic continental to marine transition in an extensional tectonics context: the Genna Selole Fm depositional system in the Tacchi area (central Sardinia, Italy)
| Autor: | Luca Giacomo Costamagna |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
010506 paleontology
geography geography.geographical_feature_category Coastal plain Alluvial fan Geology Context (language use) 010502 geochemistry & geophysics 01 natural sciences Sedimentary depositional environment Paleontology Tectonics Siliciclastic Extensional tectonics Transgressive 0105 earth and related environmental sciences |
| Zdroj: | Geological Journal. 51:722-736 |
| ISSN: | 0072-1050 |
| DOI: | 10.1002/gj.2680 |
| Popis: | In Eastern Sardinia during the early Middle Jurassic, Alpine Tethys opening triggered the rise of a temporary tectonic high. The high collapsed rapidly, was fragmented into separate blocks, and subsequently covered by continental, transitional, and finally shallow marine deposits forming a narrow depositional system comprising the Genna Selole Fm. Present-day exposures in the southern part of the palaeo-high allow the sedimentological evolution of the transgressive cover sequence to be ascertained. Initial terrestrial deposits comprise alluvial fan deposits located at the mouths of palaeovalleys. These pass into braid-deltas and in the coastal areas located between adjacent valleys mouths, palustrine and coastal plain tidally-influenced environments developed. These environments interfingered laterally and passed seaward into a transitional, siliciclastic to carbonate tidal environment. With the collapse of the tectonic high, the continental to transitional environments were transgressed with deposition of marine carbonates. A comparison with similar coeval deposits of the W-Mediterranean domain has been undertaken. Copyright © 2015 John Wiley & Sons, Ltd. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text