Norges unike skjærgård

(Norways widespread coastal platform – English version below)

Normalt tilbringes påska i fjellet, i år kombineres fjell og hav på segl og ski, langs norskekysten fra Tromsø til Ålesund. I realiteten ser det ut til at tre dager i Lofoten kanskje blei den skikjøyringa me fekk. Snart i Røyrvik nå med sikte på Sunnmørsalpane, men mildvær og regn har prega dei siste dagene langs kysten fra Svolvær, i tillegg til kraftig motvind og sakte gange. Vestfjorden fra Svolvær til fastlands-norge var et reint mareritt med 2-3 meter krappe bølger og sterk vind prega av kvalme og dårlig befatning. Letta då me kom til Nordskot og kunne seile innaskjærs. Akkurat dette ”fenomen” legger grunn for neste blogg-innlegg. Medan bølgene nå herjer opp i 4-5 meter lenger ute,  seiler me i nesten flat hav innaskjærs. Se bølgekart under som eksempel, hentet i dag fra windyty.

Bilda over er tatt fra seilbåten barba i påska og i januar, og viser eksempel fra påsketuren og Norges skjærgård langs helgelandskysten 

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Imposing dolomite marble cliffs also called “Norwegian Snow” on Storfjellet in Breivikeidet (Troms, Norway)

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.

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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

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Diamonds in the skyline of Tromsø?

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.

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An example of an Eclogite from Almenning, Norway (Image found here).

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(Northern) Europe’s Grandest Canyons

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. 

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Jutulhugget i Rondane, Hedemark (image found here)

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What are we walking on?

If you were planning on skiing, snowboarding, snowshoeing or otherwise going into the mountains this weekend, perhaps you would be interested to know what you are walking on. Would it surprise you to learn that some of the rocks on the Island of Kvaløya, in the Troms district of Norway, are 1.77-1.8 billion years old? That is 1800000000 years old.

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Map of Western Troms Geology from Bergh et al., 2012.

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What is so unique about Norway?

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Tomma Island, Nordland. Part of the Rödingsfjället Nappe Complex, these rocks are mid-grade metamorphosed rock with a sedimentary origin.

Many people would answer the long coastline and fjords of Norway. Even though fjords exist in other countries as well, such as on Greenland, Alaska, Iceland and New Zealand, nowhere in the world are the fjords so accessible and so numerous. Norwegian fjords are narrow, long and deep. The second and third largest fjord in the world both are in Norway (the largest is in Greenland).  Besides fjords there are many other examples of a unique culture and heritage in Norway; the Sami culture, wooden architecture, Norwegian salmon, lutefisk (and other traditional food), the North Sea oil and the Norwegian ‘folkedrakt’.

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