B3 – Fluid expulsion in accretionary wedgesFederico Cimmino2019-01-22T17:45:14+01:00
B3 – Fluid expulsion in accretionary wedges: what can we learn from Miocene seep carbonates (Emilia and Tuscan Apennines, Italy)
Daniela Fontana, University of Modena and Reggio Emilia, Italy Stefano Conti, University of Modena and Reggio Emilia, Italy Claudio Argentino, University of Modena and Reggio Emilia, Italy Chiara Fioroni, University of Modena and Reggio Emilia, Italy
Type: Post-Meeting Duration: 2 days Cost: € 250,00 Start: Rome (to Bologna by train included) (14th September 2019 – early morning) End: Bologna (15th September 2019 – late evening) Difficulty level: Medium Participants: min 8 max 16
Seep-carbonate body in hemipelagites of the inner foredeep (Marnoso – arenacea Fm)
The field trip will focus on key-outcrops of seep-carbonates representative of a long history of seepage and dynamic conditions in the Miocene wedge-top and inner foredeep of the Emilia and Tuscan Apennines (SassoStreghe, Castagno d’Andrea and Palazzuolo outcrops). Carbonates form isolated bodies up to 250 m wide and 30 m thick with stratiform and pinnacular geometries, surrounded by meter-sized satellite blocks. Recurring facies include abundant conduits and drusy-like cavities associated with breccias. Articulated chemosynthetic fauna (Lucinid and Vesycomid) locally occur, often in life position. The peculiar geochemistry of the seep-carbonate (Sr isotopes, REE and Mo, U enrichments) will also be discussed in terms of different fluid sources and dynamic seepage conditions. The outcrops show several analogies with modern seep systems in similar structural context, in terms of dimension and geometry of authigenic bodies and their spatial distributions. This comparison allows to outline an evolutive model of seepage on accretionary wedge and provides constraints useful for a more accurate interpretation of both ancient and modern seep systems.
Rome to Bologna by high-speed train. Field-trip by car-minivan from Bologna to Modena hills (first day) and to Tuscan-Romagna Apennines (second day). Transfer to Bologna airport or train station for departure.
The fieldtrip will include short walks (30 minutes maximum) on dirty roads and relatively steep (see photo) trails for reaching the outcrops and the surrounding in a suggestive landscape of Tuscan and Emilia hills. Expected weather conditions: temperature in September ranges from 22° to 10 °C; the altitude varies from 400 to 1000 meters. We recommend trekking shoes and clothing for rain. Accommodation is planned in local country hotels (B&B) that offer typical local cuisine.