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分布于罗定—广宁断裂北侧的那蓬岩体是典型的岩浆成因花岗岩，它富含堇青石、红柱石和夕线石等富铝矿物。采集于滨北新珠塘采场的花岗岩包含两类石即短柱状和长柱状晶体。锆石U－Pb定年结果表明，其下交点年龄为418±12Ma，而上交点年龄为1607±96Ma，它们分别代表岩体的形成时代和源岩时代。故那蓬岩体是加里东期岩浆活动的产物。
The Pu-pont body distributed on the north side of Luoding-Quang Nin fault is a typical magmatic-origin granite that is rich in Al-rich minerals such as cordierite, andalusite and sillimanite. The granite collected in the new Beitou stope in Binbei contains two types of stone, short columnar and long columnar crystals. The zircon U-Pb dating shows that the age of the next intersection is 418 ± 12Ma, while the turning point is 1607 ± 96Ma, which represent the age of formation and the age of source rock respectively. So that Peng rock body is the product of Caledonian magmatic activities.