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EarthCache

Kamenne varhany

A cache by Awercz Send Message to Owner Message this owner
Hidden : 7/28/2009
Difficulty:
2 out of 5
Terrain:
2 out of 5

Size: Size: not chosen (not chosen)

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Geocache Description:


CZ

Prírodní památka Cedicové varhany u Hlinek

Cedicové varhany u Hlinek se nacházejí v opušteném lomu asi 1km od obce Hlinky, po levé strane silnice Hlinky – Prílezy. Lom byl založen na severovýchodním svahu vrchu Hurka (817,0m) v lávovém proudu olivinického nefelinitu tretihorního stárí. V zachovalé lomové stene je ukázkove vyvinuta sloupcovitá odlucnost cedicové horniny, lidove nazývaná „kamenné varhany“.

Prírodní památka byla vyhlášena v roce 1997 na ploše 0,69ha.

Co je nefelinit?

Nefelinit je jemnozrnná až celistvá vulkanická hornina, ve které se mikroskopicky prorustají minerály nefelín a pyroxen (augit). Pokud je významne zastoupen i olivín, mluvíme o olivinickém nefelinitu. Olivín tvorí žlutozelené vyrostlice a je také prevažující složkou hrubozrných uzavrenin cizorodých hornin (xenolitu), které byly stoupajícím magmatem vytrženy ze zemského plášte. Nefelinit patrí do skupiny cedicových vulkanitu stejne tak jako olivinický bazalt, který tvorí samostatný výlev prímo na vrcholu Hurky.

 

Pro uznani logu je nutne odpovedet na nasledujici otazky:

Vaše úkoly:
1/ Jak vznikly cedicove varhany?
2/ Zmerte jakou maji pribliznou sirku jednotlive sloupce varhan.

3/ k logu pripojte foto Vás s GPS u cedicovych vahan.

 

 

EN

Basalt Organs near Hlinky are located in a deserted quarry ca. 1 km from the minucipality of Hlinky, to the left from the road Hlinky – Prílezy. The quarry was established on the north-east slopep of the Hurka Hill (817.0 metres above sea level) in lava flow of olivine nephelinite from the Tertiary Period. In the preserved quarry wall, there is perfectly developed columnar jointing of the basalt rock, commonly called „stones organs“. The Natural Monument was designated in 1997 on an area of 0.69 hectares.

What is nephelinite?
Nephelinite is a fine-grained to aphanitic volcanic rock, where the minerals nepheline and pyroxene (augite) are combinated on a microscopic level. If olivine presence is significant, then we speak about olivine nephelinite. Olivine forms small yellow-green crystals, and it is also the predominant component of coarse-grained inclusions of heterogeneous rocks (xenoliths) whitch were removed by the rising magma from the Earth´s mantle. Nephelinite belongs in the group of basalt volcanic rocks, similarly as olivine basalt, forming a separate rock outcrop directly on the peak of Hurka.

 

Your tasks:

1/ How was basalt organs formed ?
2/measure the approximate width of individual organ columns.
3/ add a photo of yourself with your GPS unit front of the basalt organs.

Additional Hints (No hints available.)



 

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Current Time:
Last Updated: on 6/10/2018 11:52:05 AM Pacific Daylight Time (6:52 PM GMT)
Rendered From:Unknown
Coordinates are in the WGS84 datum

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