B1 – The Messinian sediments of the Tertiary Piedmont Basin:
a record of the Messinian Salinity Crisis and of circulation of gas-rich fluids

Leaders

Francesco Dela Pierre, University of Torino, Italy
Luca Martire, University of Torino, Italy
Marcello Natalicchio, University of Torino, Italy

Contact person: luca.martire@unito.it

Type: Post-Meeting
Duration: 2 days
Cost: € 270,00
Start: Rome (to Turin by train) (13th September 2019 – late afternoon)
End: Turin (15th September 2019 – late afternoon)
Difficulty level: Low/Medium
Participants: min 5 max 23

B1: The Messinian sediments of the Tertiary Piedmont Basin: a record of the  Messinian Salinity Crisis and of circulation of gas-rich fluids | Post meeting Trips | IAS 2019 Rome
Slump scar in slope marls
Dykes and carbonate veins
Selenitic gypsum

The fieldtrip aims at illustrating the stratigraphic architecture of the Upper Messinian sediments including the record of the Messinian salinity crisis (MSC) and the effects of circulation of methane-rich fluids through the sedimentary column before and during the crisis itself. The succession includes: Tortonian and lower Messinian slope marls and organic-rich shales which record progressively more restricted conditions heralding the advent of the MSC and contain CH4-derived carbonates including Lucinid-rich chemoherms and a wide array of fossil-free stratabound and cylindrical concretions; primary evaporites e.g. selenitic and cumulate gypsum interbedded with shales and marls deposited during the first phase of the MSC (5.97-5.60 Ma); clastic gypsum sediments and mass wasting deposits, including both gypsum blocks and masses of CH4-derived carbonates, representing the product of the second phase of the MSC (5.60-5.55 Ma). The products of circulation of gas-rich fluids during the Messinian in older (Oligocene), coarse-grained clastic sediments will also be shown which resulted in huge masses of strongly cemented sediments crossed by a complex network of polyphase dykes and carbonate-filled veins.

Itinerary

Rome to Turin (train), Turin-Moncalvo-Tortona-Turin (minivan)
Technical Information

The fieldtrip is planned as low-medium difficulty short walks on dirty roads and trails for reaching the outcrops and underground quarries in a suggestive hilly landscape of Piedmont at no more than 300 msl. Participants will be transported with minivans. Expected weather conditions: sunny and mild (around 25°) days are expected in September but rain cannot be excluded.