GEO Wednesday: The Scandinavian Caledonides - a 100 million years of trans-oceanic marriages and divorces
Lecture by professor Fernando Corfu from UiO: Department of Geosciences.
Today, India is converging and colliding with Asia and being pushed down, the doubling of the crust forming the high Himalayan Mountains. A similar process about 400 million years ago led to a major collision between the two large continents Laurentia and Baltica, also involving a number of smaller pieces of crust and volcanic chains.
In this encounter Laurentia was pushed on top of Baltica depressing the tip of Baltica some 100 km into the mantle. At this point Baltica had been travelling across the globe enclosed in its tectonic plate for about 200 million years after having broken away from an earlier large supercontinent called Rodinia. The moving plates also created volcanic arcs in the ocean and at continental margins such as in Indonesia and the Andes today.
In other places some continental plates were ripped apart detaching ribbons of continents which then moved on as independent elements. Their eventual assembly in the Caledonian mountains created a puzzle, which we geologists are trying to reconstruct by studying the individual pieces, searching for evidence concerning their history and origin, their travels and previous ties to other continents and tectonic plates. Where did they break away from? How did they end up in new associations?
Once a month in the relaxed atmosphere of the Science Library geoscientists at the University of Oslo will present their research and thereby introduce geosciences to a wide audience, from first year Bachelor students to curious colleagues at the university. It is possible to ask questions after the presentations.
The talks are in Norwegian or in English.
Waffles and coffee/tea will be served.
All are welcome!