Norwegian version below.
Saturday, two friends (Morgan and Sten-Andreas (also a geologist)) and I went ski touring on Storfjellet in Breivikeidet, Troms. The days are so much longer now, and even though we had bit of an alpine start, we walked in sun most of the time. Nice to feel that the sun is starting to warm again after a couple of months of polar-nights.
Me and Morgan studying a little outcrop or block of rock on or way up the mountain, it got our attention because of the rare color. Turned out to be the first clue of what later to come! Picture: Sten-Andreas Gundvåg
All underlined words are defined under the Dictionary tab of our blog! (Norwegian version below)
There are two types of rock that typically host diamonds. Kimberlites and Lamproites are igneous rocks that originate deep within the mantle (usually 150-450 km deep). Diamonds form within the mantle when carbon is subjected to extremely high pressures, and then they arrive at the surface when magma from these depths carries the diamonds up to the surface. The magma then cools into either Kimberlite or Lamproite with diamonds trapped inside. There is an additional rock type that can contain diamonds: Eclogite. Unfortunately, the diamonds in Eclogite are generally too small to be of economic worth so Eclogite is famous for other reasons. Eclogite is one of the densest rocks known to man – its density is hypothesized to be one of the drivers for plate tectonics. Eclogite forms as basaltic rock is subducted, and exposed to extremely high pressure within the mantle. For an Eclogite to form, the basalt needs to be subducted to a depth of at least 45 km.
A Norwegian version of this blog-post exist below the English version.
I (Malin) got the idea of this post by talking to my sister, Melissa (not a geologist). She visited Alvdal this summer. While hiking, they occasionally crossed a large canyon (jutulhugget canyon). She explained it as quite impressive, and the sight made her and her girlfriend eager to learn more about how it formed and Norway`s geology. This short blog-post will tell you about canyons in Norway, how they form and what makes them so unique.