Dading iron mine in Lianping

Guangdong province is well known as the largest iron ore deposit

and is also the most typical skarn type deposit in South China. The LA-ICP-MS zircon U-Pb age of coarsegrain porphyritic biotite granite and mediumgrain porphyritic biotite granite from Dading pluton

closely related to mineralization in Dading mining area

are (174.3±3.6) Ma (MSWD=1.6) and (176.9±4.3) Ma(MSWD=2.6)，respectively

and it shows the emplacement age of Shibei pluton belonged to the early Jurassicmiddle Jurassic

and it was the product of the first magma activity of yanshanian period. The Shibei pluton was formed in extrusion tectonic setting

in the process of subduction of the Pacific plate under Eurasian plate in the early Mesozoic. Its source mainly from crust

formed by crustal material melting and magma consolidation

similar to the Fogang pluton

is crustal transformation type(Stype) granite.