【摘要】 台马紫苏辉石花岗斑岩体的形成,与早二叠世未发生的使钦州华力西地槽回返的强烈褶皱运动和岩浆活动有关。台马岩体的U-Pb锆石等时线年龄为235.2百万年,Rb-Sr全岩等时线年龄为220.98±12.84百万年。这说明该区岩浆形成于华力西末期。印支运动使岩浆重新沸腾并沿断裂上侵,定位于下三叠统中,形成台马紫苏辉石花岗斑岩。更多还原

【Abstract】 The formation of Taima hypersthene granite-porphyry mass at the endof the Lower Permian is closely related to the intense fold movementand magmatic activity, which resulted in the inversion of the Qinzhou Vari-scan geosyncline. The U-Pb isochron age of the zircons is 235.2 m. y., whilethe Rb-Sr isochron age of the whole-rock samples is 220.98±12.84 m. y.,These results show that the time of formation of the magma is at theend of the Variscan cycle. The Indo Sinian movement made. the magmareactivate, intrude up along the fault, emplace in the Lower Triassic, andfinally become Taima hypersthene granite-porphyry mass.更多还原