The magma of melted detaching and sinking crystal completely mixes with that of the melted crust in the magmatic chamber of crust, which forms the Palaeogene syncollision and volcanic arc magma.

It has features of "s" granite and as pulsation intrusion contact and formed the intraplate synorogenic period setting.

The experiment shows that MPEG-4 was higher compression ratio and better image quality at same compression ratio. Compared with MPEG-2, it is more suitable for low-bit network ratio.