The Precambrian granitoid pluton emplaced in the Paleoproterozoic-Mesoproterozoic Baoban Group in Gezhen area, northwest Hainan Island, south China was dated by SHRIMP U-Pb analysis assisted by CL image.

Recommendation for the new geochemical classification scheme of granitic rocks and review for the relevant subjects;

Using LA-ICPMS,this study firstly reports magmatic zircon ages for granitic rocks from the Nansha micro-block,South China Sea.

The streaky structures of granitic rock extraordinarily develop in Tiantangshan area, they can be regarded as two types as differentiated streaky structure and transpositional-compound streaky structure according to their geneses.