Lithodemic Units of Mesozoic Intrusive Rocks in Tongbai-Dabie Mountain Area

Intrusion isotopic ages were 120Ma,those of the Cretaceous era.Intrusive rocks are mostly incompatible intrusive contact with wall rock.Beveling intrusive contact is between the super-unit and sequence,each unit of super-unit elements is surge intrusive contact or pulsating intrusive contact.Emplacement mechanisms are mostly strong,they were round or elliptical in the plane,with concentric ring structure.Emplacement model is dominated by expansion of thermal light balloons,controlled by faults or along the two faults composite parts in place.Genetic types of rocks is constructed of "I"-type granite after tectonic epoch,part structure of "I"-type granite,which has not only temporal sequence,but also a space on a regular distribution,with zonal distribution in plane.Petrochemistry shows calc-alkaline→alkaline series,weak aluminum→peraluminous series,which constitutes the super-cell system of sequence evolution.