What will happen if the the temperature pressure conditions exceeds the requirement for metamorphism?

What will happen if the the temperature pressure conditions exceeds the requirement for metamorphism?

Metamorphism of the protolith changes the texture and mineralogy of the original rock. What will happen if the the temperature-pressure conditions exceeds the requirement for metamorphism? Rocks will melt and form igneous rocks. It usually occurs when rocks are squeezed in one direction with the presence of water.

What is the upper limit of metamorphism?

700–900 °C
The upper boundary of metamorphic conditions is related to the onset of melting processes in the rock. The maximum temperature for metamorphism is typically 700–900 °C, depending on the pressure and on the composition of the rock.

What type of metamorphism is caused by high temperature and high pressure imposed over a large area?

High-grade metamorphism takes place at temperatures greater than 320oC and relatively high pressure. As grade of metamorphism increases, hydrous minerals become less hydrous, by losing H2O, and non-hydrous minerals become more common.

What is retrograde metamorphism in geology?

Retrograde metamorphism (diaphthoresis, retrogressive metamorphism) is the mineralogical adjustment of relatively high-grade metamorphic rocks to temperatures lower than those of their initial metamorphism.

What geologic conditions and forces cause metamorphism?

Metamorphism occurs because some minerals are stable only under certain conditions of pressure and temperature. When pressure and temperature change, chemical reactions occur to cause the minerals in the rock to change to an assemblage that is stable at the new pressure and temperature conditions.

What is metamorphism in geology?

Metamorphism is a process of mineral assemblage and texture variation that results from the physical-chemical changes of solid rocks, caused by factors such as crust movement, magma activity, or thermal fluid change in the earth. From: Unconventional Petroleum Geology, 2013.

What is regional metamorphism in geology?

[ rē′jə-nəl ] A type of metamorphism in which the mineralogy and texture of rocks are changed over a wide area by deep burial and heating associated with the large-scale forces of plate tectonics.

What geologic conditions are necessary for shock metamorphism?

Shock Metamorphism – When a large meteorite collides with the Earth, the kinetic energy is converted to heat and a high pressure shock wave that propagates into the rock at the impact site. The heat may be enough to raise the temperature to the melting temperature of the earth rock.

What is high pressure regional metamorphism?

High pressure regional metamorphism When subducting oceanic slabs are dragged down to depths exceeding 50 kilometres, the basalt is metamorphosed at very high pressures to form a dense rock with the same bulk chemical composition but different mineralogy (dominantly pyroxene and garnet) and texture.

How does metamorphism work in geological process?

What is regional metamorphism pressure?

In regional metamorphism, rocks that form closer to the margin of the tectonic plates, where the heat and pressure are greatest, often differ in their minerals and texture from those that form farther away. Compare contact metamorphism.

What is the upper limit of metamorphism in rocks?

The upper limit of metamorphism, beyond which igneous conditions occur, is the temperature and pressure at which partial melting of the rocks begins. This limit varies greatly, depending on the pressure, the chemical composition of the rocks, and the presence of a fluid phase.

What causes rocks to break apart at convergent plate boundaries?

Compression squeezes rocks together, causing rocks to fold or fracture (break) (figure 1). Compression is the most common stress at convergent plate boundaries. Rocks that are pulled apart are under tension. Rocks under tension lengthen or break apart.

Which is the most common type of stress at a plate boundary?

Compression is the most common stress at convergent plate boundaries. Rocks that are pulled apart are under tension. Rocks under tension lengthen or break apart. Tension is the major type of stress at divergent plate boundaries. When forces are parallel but moving in opposite directions, the stress is called shear (figure 2).