origin metamorphic rocks arise from the transformation of existing rock types process called...

Metamorphic rockOrigin Metamorphic rocks arise from the transformation of existing rock types

Process called metamorphism, which means "change in form".

The original rock is subjected to heat and pressure, causing profound physical and/or chemical change

Formation zone (ratio of heat and pressure)

upper zone - epizone middle zone - mezozone

lower zone – katazone

Types of metamorphism

Regional metamorphism -- affects a large area; commonly due to mountain building; foliated rocks common

Contact metamorphism -- rocks near igneous intrusion get baked; produces non-foliated met. Rocks

Metamorphic rockEPIZONE

P – decisive, thin 1-2mm slak texture, directional texture: clay shale, phyllite, talk schist

MEZOZONE

P – T equaly decisive, thick >2mm slak texture, directional texture: schist (mica)

KATAZONE

T – decisive, thin 1-2mm slak texture, directional texture: clay shale, phyllite, talk schist

Metamorphic rock EPIZONE

Clayslate: composed clay minerals and quartz grains and the typical color is gray. Water resistrant.

Phyllite: foliated metamorphic rock created from slate that

is further metamorphosed so that very fine grained

white mica achieves a preferred orientation . Typicaly

black, dark gray, thin slated (mm), shiny

Metamorf kőzetek

Metamorphic rock EPIZONE

Greenschist: green minerals such as chlorite, serpentine and platy minerals such as muscovite and platy serpentine, thin slated (mm),

Metamorphic rock EPIZONE

Talc schist: soft, talc mineral. Light coloured

Serpentinite:- green – black

-Serpentine mineral, quartz, calcite, pyrite

-can be polished

-strong

Metamorphic rock

Metamorphic rock MEZOZONE

Schist (mica)

- sparkles (mica content), grey

- biotite, muscovite, feldspar, quartz

- local building material

Metamorphic rock KATAZONE

Gneis: - looks like granite, BUT: - directional terxture - minerals: quartz, feldspar, plagioclase, biotite, amphibole

Crystaline texture, measonary stone, load bearing structure, ornamental stone, crashed stone (ballast under rails, roads, concrete agregate)

Metamorphic rock KATAZONE

Marble

Crystaline texture, any colour (bright), Fizzles to acids

Calcite veins, fells colder than limestone (becouse wery dense)

Load bearing structure, Ornamental stone, chemistry

Metamorphic rock