B3 – Fluid expulsion in accretionary wedges: what can we learn
from Miocene seep carbonates (Emilia and Tuscan Apennines, Italy)

Leaders

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

Contact person:daniela.fontana@unimore.it,
stefano.conti@unimore.it

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

 B3 - Fluid expulsion in accretionary wedge | Post meeting Trips | IAS 2019 Rome
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.

Itinerary

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.
Technical Information

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.