Date

Sunday 9 June 2024
 

Description

The Cambro-Silurian (Palaeozoic) sedimentary rocks of the Oslo Region record two major Palaeozoic tectonic events – SE-directed thrusting during the Caledonian orogeny and E-W-directed extension during the formation of the Permo-Carboniferous Oslo Rift.

In this field trip, we are going to look at deformation structures (faults and folds) at different scales in Oslo region.

The first stop includes Huk in Bygdøy, which present small to medium size structures, while the second stop in Nesodden presents a segment of a large-scale fault (Oslofjorden Fault).

First stop: Bygdøy (Huk)

At the popular beach of Huk, alternating beds of limestones and dark shales contain nice examples of thrust faults, thrust-related folds, and imbricate structures at different scales. Here, one can observe a variety of complex Caledonian contractional structures alongside Permo-Carboniferous faults and intrusions (Ryen, 2020). The field trip offers insight into the tectonic evolution of the Oslo Region, with field examples of two generations of faults and structures. The stop also includes the stratotype for the Ordovician Huk Formation, known for its fossils.

Second stop: Nesodden (Alværn Brygge)

The Nesodden Fault is a major (northern) segment of the Oslofjorden Fault, which separates Precambrian (basement) and Palaeozoic rocks. This is a fault at the margin of Oslo continental rift system in southeastern Norway, which formed during Permo-Carboniferous. The Oslofjorden Fault trends N-S to NE-SW and could have been active in multiple deformation events (Swensson, 1990). Fault plane and fault rocks of different types are exposed along Alværn Brygge, where we are going visit in this stop.
 

Field Trip Leaders

• Anita Torabi (University of Oslo)
• Sofie Hildegard Ryen (University of Oslo)
• Abhisek Basa (University of Oslo)

Health and Safety Requirements

Walking tours are short and accessible to everyone of average fitness. Both locations are at a beach close to the sea. Attendees are recommended to wear hiking shoes or good walking shoes. There could be possibility for swimming in Nesodden but is on your own risk.
 

Route Information