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Meteoritnedslaget Silurringen / Getryggen

A cache by Ant Z Send Message to Owner Message this owner
Hidden : 08/14/2011
Difficulty:
2 out of 5
Terrain:
2 out of 5

Size: Size: not chosen (not chosen)

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Geocache Description:


The unique geological formation of Silurringen is a result of the large meteorite impact and the glacial erosive forces. Here you will find traces of this events.

To log this Earthcache as a found you have to hike the 750 meter path around the naturreservat.
It starts at the parking area "Styggforsen".
Answer the questions which you can find at the end of the listing.

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Den ringformade geologiska strukturen i Siljansområdet (Silurringen) tilldrog sig tidigt stort intresse hos såväl svenska som utländska forskare. Den redovisades på en karta över södra och mellersta Sverge redan 1832. Strukturen har få motsvarigheter i övriga världen både vad gäller utseende och sammansättning. Under årens lopp har flera teorier framlagts som förklaring till ringens ursprung. Idag vet vi med säkerhet att uppkomsten av ringen har att göra med att jättelikt meteoritnedslag för ca 360 mio år sedan.

En jättemeteorit på mellan 2-3 km diameter slog ned på jordytan som då täcktes av ett ca 400m tjockt lager av sedimentbergarter (silurisk sandsten, kalksten och lerskiffer) på ett underlag av främst granit.

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EN:
The ring-shaped geologic structure of the Siljan area (Silurringen) attracted the early interest in both Swedish and foreign researchers. It was reported on a map of southern and central Sweden already 1832. The structure has few counterparts in the rest of the world both in appearance and composition. Over the years several theories put forward to explain the origin of. Today we know with certainty that the onset of the ring has to do with that giant meteorite impact about 360 Mio years ago. A giant meteorite of between 2-3 kilometers in diameter struck the Earth at that time was covered by an approximately 400 meter thick layer of sedimentary rocks (Silurian sandstone, limestone and shale) on a backing of mainly granite.



Nedslaget gav upphov till en krater som var 30-40km i diameter och 5 km djup.
De branta kratersidorna var så instabila att bergmaterialet gled ned i kratern.

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EN:
The impact produced a crater that was 30-40km in diameter and 5km deep.
The steep crater sides were so unstable that rock material slid down the crater.



Den mer eller mindre lodräta ställningen av de sedimentära berglager som förekommer i ringen torde ha uppkommit i denna fas av kraterns utveckling. De centrala delarna av kraterbottnen höjdes därefter tämligen omgående som ett resultat av jordskorpans strävan att utjämna de uppkomna mäktighetsskillnaderna. Höjningen kan ses som en sorts rekylrörelse.

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EN:
The more or less vertical position of the sedimentary rock layers that occur in the ring would have been incurred in this phase of crater development. The central parts of the crater bottom was raised. Then almost immediately to smooth the thickness differences of the crustal.. The increase can be seen as a sort of recoil motion.



Under de 360 mio år som förflutit sedan meteoritnedslaget inträffade har nedbrytande krafter åstadkommit stora förändringar av landskapets topografi. Man räknar med att ca 1 km av bergrunden nötts bort. Praktiskt taget hela den ursprungliga meteoritkratern har utplånats. Tack vare att de sedimentära bergarterna sjönk ned i jordskorpan har rester av dessa bevarats fram till våra dagar.

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EN:
During the 360 mio years since meteorite impact occurred, the destructive forces brought about major changes the landscape's topography. It is estimated that approximately 1 km of bedrock eroded. Virtually all the original meteorite crater has been obliterated. Thanks to the sedimentary rock sank into the earth's crust have residues of these conserved present day.



Silurringen


Geologisk Karta


Getryggen
Den höga klippan med sina brant uppresta, tunnskiktade berglager kallas "Getryggen", ett namn som ofta används på både bergsryggar och rullstensåsar med spetsig form.

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EN:
The high cliff, with its steep upright, thin-layered rocks called "Getryggen", a name often used on both ridges and ridges with a pointed shape.



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Figure out all answers near the rock formations that you can find at the coordinates.

To log this cache as a found you have to email me via geocaching.com the answers of the following questions:

A) Find out which material Getryggen is made of and
B) how old it is.

These bedrocks sedimented originally horizontal, but the great upheaval by meteorite impact led to 360 million years ago tipped them over until its now almost vertical position.

C) Estimate the hight of Getryggen (stand near the coordinates).

D) Take a closer look at the deep grooves. Estimate the angle in which they lie.

A) Ta reda på vilket material Getryggen består av och

B) hur gammal den är.

Lagren sedimenterade ursprungligen horisontellt, men den stora omvälvning av berggrunden som meteoritnedslaget medförde för 360 miljoner år sedan stjälpte dem över ända till det nu nästan lodräta läget.

C) Uppskatta höjden på Getryggen (stå vid koordinaterna).

D) Ta en ordentlig titt på de djupa fårorna. Uppskatta i vilken vinkel de står.

Please dont wait for my permission! If there was something wrong, I will contact you!

Sorry! I had to delete logs without answer emails.

One last thing:
Please upload a photo that shows you or your GPS or only the landscape in this area. It reminds me of MY beautiful holiday there! Thank you!

I hope you enjoy this Earthcache and the beautiful area!

Have fun!

Ant Z

Additional Hints (No hints available.)



 

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