What are mechanically formed sedimentary rocks

Solution worksheet 2

Complete the following fill in the blank:
Rocks are a mixture of different naturally formed Minerals. The structure of the rock, i.e. the minerals it contains, determined by the type of formation. Same goes for that texture of the rock, i.e. for the size and arrangement of the minerals. Each method of creation brings about group-specific characteristics.

1. Rising and cooling magma leaves igneous rocks arise. It emerges little by little Crystalswhich are the greater the ever slower the molten rock cools down. So differ Plutonite of Volcanites. The colour of the rock depends on the chemical composition of the rock melt, in particular on the content of Silicon oxide. If this is over 65%, one speaks of sour Magma and the rock is right brighte.g. granite. Basic magma, on the other hand, forms dark Rocks like basalt.

2. The effect more exogenous Forces is responsible for the emergence of Sediments. Chemical and physical weathering creates differently shaped fragments which, depending on the transport medium, are further crushed and / or rounded. Deposited layers are eventually rising through print solidified (Diagenesis) and so too Sedimentary rocks. Different types are formed depending on the type of deposits.

3. If existing rocks get under again print and heat, form metamorphic rocks. On the one hand, this can be the case with mountain-building processes, where there is a Regional metamorphosis expires. Thereby the minerals are according to the acting Pressure "regulated" or transformed, the so-called Foliation of the rock. However, this can also be absent, especially if rock has direct contact with magma Contact metamorphosis subject. Metamorphites can come from everyone Kind of parent rock arise.
All rocks are subject to a permanent Cycle and can be transformed into each other.

Complete typical features of the three rock groups:

Igneous rocksSedimentary rocksMetamorphites
high strength and density,
Crystals random arranged

- fine-grained, often uniform
  Basic mass
- originated on the
  Surface of the earth
e.g .: Basalt, porphyry

- roughgrainy
- originated in large
e.g .: Granite, gabbro
- relatively soft and porous
- usually easily rubbed off
- often have one Layering
- partly contain Fossils

Clastic Sediments:
- created mechanically
- contain Rockdebris
e.g .: Sandstone, breccia,
        Conglomerate, tuff

Chemical sediments:
- created by
e.g .: Limestone, salts

Biogenes Sediments:
- arose from orga-
  niches Leftovers
e.g .: Coal, petroleum, amber

- relatively firm, but cleavable
- Foliation or volumes
tion recognizable
- Color and mineral content
through parent rock
and metamorphosisDegree
e.g .:
Sound -----> Slate
        -----> Phyllite
        -----> Mica slate
        -----> Gneiss
limestone -----> marble
Sandstone -----> Quartzite

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