Genesis and Classification of Granite

The Causes of magma and the cause of the account

The magmatic granite is formed by the magma emplacement and condensed, and undergoes the process of condensing from the source of the magma, moving upwards to the off-site - off-site granite.

The granite that accounts for the origin of the granite refers to the fact that the first rocks are transformed from the metasomatism in the solid state. The formation mechanism is closer to the metamorphism, also known as the graniteization. 2. The main view of the formation of the magmatic granite Role (Bowen): exists, but small scale. Layered and cyclic rock late differentiation. (Daly): the process of mixing magma formed by assimilation or mixing. Can only form a partial neutral

Granite magma, and can not form large rock

Deep melting or partial melting effect: that the granitic magma is mainly by the middle and lower crust of the rock part of the formation of melting. 3, the type of granite and the characteristics of granite genesis complex factors

1) the diversity of material sources

The crust and the mantle wedge-shaped area of the crust.

2) diversity of output tectonic background

Island orogenic belt; active continental margin; continental collision zone; intracontinental orogenic belt; continental rift zone;

The Classification and Types of granite Genesis

1) Material source M-type mantle and crustal mixed type

I type crust without weathering igneous rocks.

S - type crust through the weathering of the sedimentary rocks

A type mantle basaltic magma evolution, or basalt magma rises after the crust is mixed with varying degrees or loss of crustal melting products

2) Structural background: orogenic granite, transitional granite, non-orogenic granite.

From：granite