the metamorphics rocks (1)
TRANSCRIPT
![Page 1: The metamorphics rocks (1)](https://reader033.vdocuments.site/reader033/viewer/2022052606/589b372b1a28ab22038b52ad/html5/thumbnails/1.jpg)
•Cristian Galván Izquierdo •Íker Gil Fabregat •Llàtzer Miguel Valdès
THE METAMORPHIC ROCKS
![Page 2: The metamorphics rocks (1)](https://reader033.vdocuments.site/reader033/viewer/2022052606/589b372b1a28ab22038b52ad/html5/thumbnails/2.jpg)
ÍNDEX●What are the metamorphics rocks?●What are the regional and contact metamorphism?●Which are the metamorphics rocks?●Exemples: Slate, Gneiss, Schist, Marble, Micasquist, Quartzite, Micacita
![Page 3: The metamorphics rocks (1)](https://reader033.vdocuments.site/reader033/viewer/2022052606/589b372b1a28ab22038b52ad/html5/thumbnails/3.jpg)
WHAT ARE THE METAMORPHIC ROCKS?The metamorphic rocks are subjected to metamorphism.Metamorphism is the set of solid state reactions affecting a rock (of any kind be sedimentary, igneous or metamorphic) subject to conditions of pressure and different to its origin temperature.
![Page 4: The metamorphics rocks (1)](https://reader033.vdocuments.site/reader033/viewer/2022052606/589b372b1a28ab22038b52ad/html5/thumbnails/4.jpg)
WHAT ARE THE REGIONAL AND CONTACT METAMORPHISM?
Contact metamorphism is a type of metamorphism in which the change occurs in the rocks by the heat they receive when they are near a magma intrusion.
Regional metamorphism is a type of metamorphism in which the change occurs in conditions of high pressure and sometimes high temperatures.
![Page 5: The metamorphics rocks (1)](https://reader033.vdocuments.site/reader033/viewer/2022052606/589b372b1a28ab22038b52ad/html5/thumbnails/5.jpg)
WHICH ARE THE METAMORPHIC ROCKS?
![Page 6: The metamorphics rocks (1)](https://reader033.vdocuments.site/reader033/viewer/2022052606/589b372b1a28ab22038b52ad/html5/thumbnails/6.jpg)
SLATE (pissarra)It’s formed from metamorphisme of mudstone (argila)
Colour: Black
Fracture: Thin flat layers
Texture: Granular fine and homogeneous
Composition: Crystals not observable to the naked eye
![Page 7: The metamorphics rocks (1)](https://reader033.vdocuments.site/reader033/viewer/2022052606/589b372b1a28ab22038b52ad/html5/thumbnails/7.jpg)
GNEISSIt’s a foliated rock with a banded appearance and granulars mineral grains. It’s formed from granit or clays. It has wavy layers, because of the grains of granit.
Colour: Dark and light stripes
Fracture: Strips
Texture: Planar rude
Composition: Quartz, feldspar and mica.
![Page 8: The metamorphics rocks (1)](https://reader033.vdocuments.site/reader033/viewer/2022052606/589b372b1a28ab22038b52ad/html5/thumbnails/8.jpg)
MICASQUIST
Colour: Gray tones
Fracture: sheet
Texture: Schistose lepidoblastic
Composition: Mica, quartz and other minerals.
![Page 9: The metamorphics rocks (1)](https://reader033.vdocuments.site/reader033/viewer/2022052606/589b372b1a28ab22038b52ad/html5/thumbnails/9.jpg)
SCHIST
Colour: Fairly homogeneous
Fracture: A wavy and irregular structure sheet (schistose structure)
Texture: Flaky
Composition: Muscovite, biotite, chlorite, quartz, plagioclase and chloritoid, staurolite, andalusite, kyanite, garnet, sillimanite
![Page 10: The metamorphics rocks (1)](https://reader033.vdocuments.site/reader033/viewer/2022052606/589b372b1a28ab22038b52ad/html5/thumbnails/10.jpg)
MARBLE It’s formed by metamorphisme of calcareous, so it reacts with hydrochloric acid, and it makes effervescence.
Colour: white, pink, green, … it depends on the impurities.
Fracture: not foliated
Texture: fine to coarse grained,.
Composition: CaCO3, mica, magnesium silicates, graphite, iron oxides
![Page 11: The metamorphics rocks (1)](https://reader033.vdocuments.site/reader033/viewer/2022052606/589b372b1a28ab22038b52ad/html5/thumbnails/11.jpg)
QUARTZITEIt’s formed by metamorphisme of sandstone.
Colour: usually white to gray
Fracture: conchoidal fracture
Texture: coarse texture
Composition: almost entirely of quartz
![Page 12: The metamorphics rocks (1)](https://reader033.vdocuments.site/reader033/viewer/2022052606/589b372b1a28ab22038b52ad/html5/thumbnails/12.jpg)
MICA SCHIST (MICACITA)
Colour: green, grey, dark brown.
Fracture: medium grained.
Texture: foliated, platy.
Composition: quartz and mica (biotite or muscovite)