From the cause, it can be divided into four types: invasive contact, deposition contact, ejection contact and fault contact.
Invasive contact
Also known as thermal contact. This includes the contact relationship between all magmatic intrusion mass and the intruded surrounding rock.
Deposition contacts
Also known as cold contact. When magmatic intrusions are formed, they are exposed to the surface due to erosion of the earth's crust, and later covered with new sediments, that is, sedimentary contact.
Spray out the contact
The contact relationship formed by the lava covered by the lava covered on the previously formed rock layer or rock mass by the lava spilling over the surface is called the ejection contact.
Fault contact
After the formation of the magmatic rock mass, it is destroyed by the fault, so that the magmatic rock mass and the surrounding rock are in contact with the fault. The contact surface is the fault layer, which belongs to cold contact and has the characteristics of a general fault.