SHRIMP U-Pb zircon age of the Jinbaoshan ultramafic intrusion,Yunnan Province,SW China

【摘要】 SHRIMP U-Pb zircon dating gives ages of 260.6 ± 3.5 Ma and 260.7 ± 5.6 Ma for serpentinised wehrlite and plag-hornblendite in the Jinbaoshan ultramafic intrusion,respectively. The results indicate that the Jinbaoshan intrusion was emplaced at ca.260 Ma and contemporaneous with the Emeishan continental flood basalts (ECFB),similar to other mafic-ultramafic intrusions of the Emeishan large igneous prov-ince (LIP). The new ages provide a geochronological constraint on the origin of the Jinbaoshan ul-tramafic intrusion. It confirms that the Jinbaoshan ultramafic intrusion belongs to the Emeishan LIP that formed at ca. 260 Ma.更多还原

【Abstract】 SHRIMP U-Pb zircon dating gives ages of 260.6 ± 3.5 Ma and 260.7 ± 5.6 Ma for serpentinised wehrlite and plag-hornblendite in the Jinbaoshan ultramafic intrusion,respectively. The results indicate that the Jinbaoshan intrusion was emplaced at ca.260 Ma and contemporaneous with the Emeishan continental flood basalts (ECFB),similar to other mafic-ultramafic intrusions of the Emeishan large igneous prov-ince (LIP). The new ages provide a geochronological constraint on the origin of the Jinbaoshan ul-tramafic intrusion. It confirms that the Jinbaoshan ultramafic intrusion belongs to the Emeishan LIP that formed at ca. 260 Ma.更多还原