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sedimentary protolith

sedimentary protolith

SRI Petrography ID: 17

Names

[de] Sedimentäres Ausgangsgestein
[en] sedimentary protolith

Description

These metamorphic rocks formed by the alteration of preexisting sedimentary rocks (sedimentary protolith) due to changing geological conditions (metamorphism): variations in temperature, pressure, mechanical stress.

The following rock types belong to this group:
amphibolite
dolomite-marble
paragneiss
hornfels
lime-marble
marble
quartzite
schist
slate

Color

very variable

Grain Size

very variable

Texture

common grain orientation, banding, foliation, layering, folding

Minerals

variable, most common:
index minerals for metamorphic facies: sillimanite, kyanite, staurolite, andalusite, garnet.

Occurences

all over the world

Classification

Class

METAMORPHIC ROCKS

Narrower Terms

amphibolite

dolomite-marble

gneiss

hornfels

lime-marble

marble

quartzite

schist

slate