A journy to learn more about Metamorphic rocks:
What they are, How they come to be and Where to find them.
A journy to learn more about Metamorphic rocks:
What they are, How they come to be and Where to find them.
MICA SCHIST
Mica schist is a metamorphic rock that stands out for the prominent presence of minerals from the mica group, such as biotite and muscovite. This rock is formed through the metamorphism of pre-existing sedimentary or igneous rocks, under specific conditions of pressure and temperature.
MARBLE
Marble is a metamorphic rock appreciated throughout history for both its aesthetic qualities and durability. This is created through the transformation of limestone under high pressures and temperatures. Marble is known for its crystalline texture and variety of colors, ranging from pure white to darker tones, such as green, pink, gray and black.
SPOTTED SCHIST
Spotted Schist is a variety of sedimentary rocks with great energy potential. Unlike other types of schists, this one contains a significant amount of organic matter, mainly kerogen.
HORNFELS
Hornfels rocks, also known as contact metamorphic rocks, play a significant role in understanding the geological dynamics of the Earth's crust. These rocks are formed through intense metamorphic processes that occur when pre-existing rocks are subjected to high temperatures and pressures, often due to magma intrusion.
SKARNS
Skarn is a complex metamorphic rock formed through the interaction between carbonate rocks, such as limestone or dolomite, and rich fluids. This metamorphic process typically occurs in contact environments between magma and carbonate sedimentary rocks, resulting in a variety of unique minerals and textures.
GNEISS
Gneiss is formed from the metamorphism of pre-existing sedimentary or igneous rocks, such as granite. The metamorphic process involves high pressures and temperatures, resulting in the development of a peculiar texture of alternating layers. The layers can be composed of minerals such as quartz, feldspar, mica and amphibole, depending on the mineralogical composition of the initial rock.
METAMORPHICS
An infographic on how metamorphic rocks come to be.
Metamorphism is the chemical, mineralogical,
textural, and structural readjustment, in the solid
state, of any type of rocks when subjected to
physical-chemical conditions different from the
conditions during their formation.
The metamorphic process usually occurs in
endogenous environments (inside the Earth),
induced by factors such as temperature, pressure,
fluids, and time.
The newly formed rocks are called metamorphic rocks.
Thermal Metamorphism
Dominant agent is temperature.
Dynamic Metamorphism
When deviatory stresses induce deformation and recrystallization of minerals.
Dynamo-Thermal Metamorphism
Resulting from the combination of temperature and stresses, which occurs in orogenic belts.
Types of Metamorphism
Contact: intrusion of high-temperature magma into pre-existing rocks. The heat from magma alters existing minerals and forms new minerals.
Regional: action of high pressures and high temperatures, generally in areas of tectonic activity.
Hydrothermal: change caused by hot water that circulates through fissures or fractures in rocks. Heated water dissolves minerals more quickly.
Fault zone: occurs in long, narrow bands of faults or shear zones of different depths.
Shock: occurs with an impact from a meteorite, transforming minerals or even fusing with the rock.
Classification of Rocks
Slate
Schist
Gneiss
Quartize
Marble