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clastic sedimentary rocks

clastic sedimentary rocks

SRI Petrography ID: 13

Höttinger Breccie

Names

[de] Klastische Sedimentgesteine
[en] clastic sedimentary rocks

Description

clastic sedimentary rocks are hard or soft rocks, composed of rounded or angular fragments in a fine grained matrix.
Clastic sedimentary rocks are formed by cementation of grains and rock fragments in different sedimentary environments (rivers, deltas, shores, glacial)

Color

very variable. Matrix often brown to yellow

Grain Size

matrix fine grained, components range from sub-mm to m

Texture

variable, often massive, banked, bedded, cross bedded, brecciated

Minerals

matrix/cement often calcitic, sometimes aragonitic, iron oxides, silica
fragments mono-mineralic (often quartz), but also rock-fragments

Occurences

various sites all over the world

Comments

Sandstone: sedimentary rock consisting of matrix and components below 2mm
Conglomerate: sedimentary rock with rounded components above 2mm
Breccia: sedimentary rock with angular components above 2mm

Classification

Class

SEDIMENTARY ROCKS

Narrower Terms

breccia

conglomerate

sandstone