Alpine ophiolites

General information

Field trip leaders

Lydéric France (CRPG, Nancy) and Carole Cordier (ISTerre, Grenoble)

contact and info

 Lydéric France, lyderic.france AT univ-lorraine.fr

Dates

16 – 19 September 2022

Meeting point and time

Departure Saturday 16 from Baveno – Meeting point in front of Hotel Dino at 15:00

Ending place and time

All participants will be dropped at the Lyon train station on the morning of Wednesday 20 (around 9 am.)

Cost

400 €

Minimum / Maximum number of participants

20

Description

Let’s explore an Alpine and a Variscan ophiolite in the Alps…

Scientific topics
  • Igneous processes and architecture of oceanic lithosphere in Pre-Hercynian and pre-Alpine ophiolites.
  • Igneous differentiation of magmatic reservoirs
  • Melt migration and emplacement
  • Oceanic plagiogranites (and other felsic lithologies) origin: hydrous anatexis vs fractional crystallization
  • Moho signification at slow-spreading oceanic centers
  • Hydrothermalism record: Intra-oceanic metamorphism and related lithospheric cooling
  • Gabbroic bodies emplacement in (serpentinized or unaltered?) mantle

Program and itinerary

Day 0 – Saturday 16 Sept.

Travel by large bus from Baveno in the afternoon to the first accommodation place in the Montgenèvre area (the village of the Chenaillet ophiolite). Dinner. Discussions on the western Alps architecture, and geological context of the field trip.
Accommodation: tbd

Day 1 – Sunday 17 Sept.

Hike from Montgenèvre to the ophiolite (through col de la cabane des douaniers). Main subjects of the day will be igneous differentiation, melt migration, oceanic plagiogranite origin, ophiolite architecture, and Moho signification at a slow-spreading center.
Accommodation: tbd, on the way between Montgenèvre & Chamrousse.

Day 2 –  Monday 18 Sept.

Hike from Chamrousse ski resort to the ophiolite (through la Croix de Chamrousse). Main subjects of the day will be the timing of magma body emplacement (pre- or post-serpentinization?), the origin of felsic veins (or oceanic plagiogranites), melt migration in the peridotite section (dikes versus porous flow; discussion of chromitites origin), and the hydrothermalism sequence and relations to magma emplacement and intra-oceanic deformation.
Accommodation: tbd, on the road to Lyon where all participants will be dropped at the train station.

Day 3 – Tuesday 19 Sept.

All participants will be dropped at the Lyon train station in the morning, around 9 am.

Practical information and logistics

Connection from/to starting/ending place

Transport will be organized by bus from the conference site in Baveno. Departure at 15:00 in front of Hotel Dino.

Transportation arrangements

Large bus with driver to bring the group to the different sites

Accommodation

Full board with lunch packages everyday

Equipment

In addition to usual field equipment (hammer, hand-lens, field book), participant must bring solid hiking boots, sun protection / sunglasses, warm clothing and a wind and waterproof jacket. Euros for drinks, camera is recommended. Passport or ID-card valid for Italy and France.

Other information

The field trip includes two day hikes to the Chenaillet (Day 1) and Croix de Chamrousse (Day 2), in mountain areas up to 2650m altitude. A reasonable level of fitness is therefore expected from the participants. Each day hike will include around 600-800m of vertical ascent (and vertical drop), partly on trails and partly in rough terrains.

Contact information

lyderic.france@univ-lorraine.fr