Magma Activity

Magma activity can be divided into two, namely:
1. MAGMA intrusion
Ie breach of magma from the bowels of the earth that is not up to the surface of the earth
Is called the intrusion of magma intrusion or plutonisme.
Igneous rocks formed from these events are called intrusive.
   
Magma intrusion events can result in:
a. Gang or dikes
That is the result of intrusion of magma rocks that cut the layers of the lithosphere with flat or plate shape.
b. Sills or intrusion keeping batolit
Namely the frozen magma inserts between two layers of the lithosphere, relatively thin, and wide.
c. Batolit
That is igneous rock that formed in the magma chamber, because the drop in temperature is very slow.
d. Apofisis
That is a relatively small alley, a branch of the alley (dikes).
e. Diatrema
Namely the eruption of rock filler pipe, cylindrical from the magma chamber to the surface of the earth.
f. Lakolit
Ie igneous rock derived from magma recharge between two layers of the lithosphere and formed like a convex lens, essentially flat.
g. Lopolit
Ie igneous rock derived from magma recharge between two layers of the lithosphere and the formation of a convex lens shape, essentially concave.
h. Pacolit
Ie igneous rock derived from magma recharge between two layers of the lithosphere and form a flat formation, with essentially concave.

MAGMA

Magma is molten rock tinggiyang incandescent temperature occurs from different minerals and contain a gas that dissolves in it.
Most of the magma out of the body of the earth through the cracks.
There is an acidic magma (many contain quartz or SiO2) and alkaline magma (containing a little quartz).

TYPES OF DEPRESSION VOLCANIC

TYPES OF DEPRESSION volcanic
Depression is the morphology of the volcanic Volkan which generally form the basin. Based on the filler material is divided into seven volcanic depression:
1. crater
The crater is the depression formed by volcanic eruptions with a maximum diameter of 1.5 km, and not occupied by any material other than the eruption.
2. crater lake
Crater is a crater lake filling with rain.
3. caldera
Volcanic caldera that is depression, not necessarily by the formation of the eruption, but was preceded by subsidence in the complex Volkan, measuring more than 1.5 km. Usually the caldera formed by the eruption and lava terhembusnya hole, then followed by the avalanche crater wall.
4. Dent tectonic volcanics (Major Vulcano-Tectonic Depression)
An indentation is very large and elongated shape are influenced by tectonic and volcanic processes.
5. Lurah volcano (Volcanic Graben)
Lurah volcano is a straight-walled structures that collapse, which occurred dibagian peak cone volcano slopes.
6. Gap volcano (Volcanic Fissure Through)
Form of elongated grooves on the body due pencelahan volcano. Pelengseran Pencelahan occurs because one side of the slab due to stress or pressure of the magma breaking through the cone material excessive burden which rested on a weak base layer.
7. Pseudo volcanics (Pseudo Volcan)
Morphology similar to volcanic cones, which comprise material derived from adjacent Volkan.

volcanism

volcanism

Volcanism is all the events associated with the magma reaches the surface of the earth comes out through cracks in the crust or through a central tube (canal crater / diatrema).

Magma that comes out to the earth's surface is called lava.

Volcanism may be an eruption, melt, or a mixture of eruption and melt.