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

• 来源期刊: 科学通报(英文版)
• 年，卷（期）: 2009,（1）
• 页码范围: 168-172
• 页数: 5页
• 语种: 英文
• DOI: 10.1007/s11434-008-0488-x

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.