Geologische Spuren in der Flora, Germany
N 50° 57.650 E 006° 58.191
32U E 357431 N 5647431
Geologische Spuren in der Flora, Germany
Waymark Code: WMDP2Z
Location: Nordrhein-Westfalen, Germany
Date Posted: 02/08/2012
Views: 42
The first stage shows you the half of a volcanic bomb from the Laacher See. A volcanic bomb is a mass of molten rock (tephra) larger than 65 mm (2.5 inches) in diameter, formed when a volcano ejects viscous fragments of lava during an eruption. They cool into solid fragments before they reach the ground. Because volcanic bombs cool after they leave the volcano, they do not have grains making them extrusive igneous rocks. Volcanic bombs can be thrown many kilometres from an erupting vent, and often acquire aerodynamic shapes during their flight. Bombs can be extremely large; the 1935 eruption of Mount Asama in Japan expelled bombs measuring 5-6 m in diameter up to 600 m from the vent.
Zum Vergrößern bitte Anklicken / click for enlargement
Granite
The Vanga-Granite (N50° 57.647 E6° 58.238)
The red Venga-Granite you can see at stage 2 come originally from Northern Europe. The rock was formed by the artist Ulrich Rückriem and was lent the Flora. Granite in general is a common and widely occurring type of intrusive, felsic, igneous rock. Granites usually have a medium to coarse grained texture. Occasionally some individual crystals (phenocrysts) are larger than the groundmass in which case the texture is known as porphyritic. A granitic rock with a porphyritic texture is sometimes known as a porphyry. Granites can be pink to grey in color, depending on their chemistry and mineralogy. By definition, granite has a color index (i.e. the percentage of the rock made up of dark minerals) of less than 25%.
Granite is an igneous rock and is formed from magma. Granitic magma has many potential origins but it must intrude other rocks. Most granite intrusions are emplaced at depth within the crust, usually greater than 1.5 kilometres and up to 50 km depth within thick continental crust. The origin of granite is contentious and has led to varied schemes of classification.
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