大火成岩省研新进展

大火成岩省的含义是指连续的、体积庞大的火成岩(包括镁铁质和长英质火成岩)所构成的巨型岩浆岩建造。镁铁质大火成岩省可分为:大陆溢流玄武岩、火山被动陆缘、大洋高原玄武岩、大岩墙群和大层状侵入体。镁铁质大火成岩省是地幔柱岩浆活动的直接产物,一般与聚敛板块边界无关。长英质大火成岩省主要由酸性、中酸性熔结凝灰岩及与之有成因联系的花岗岩构成,与岩石圈伸展构造和玄武岩浆底侵作用有不可分割的联系。今后研究方向包括大火成岩省的形成与地幔动力学的联系以及它与大陆增生、大陆裂解和生物绝灭的关系。此外还包括大火成岩省与成矿作用研究

New Progress in Studying the Large Igneous Provinces

Large Igneous Provinces (LIPs) are referred as continuous and voluminous magamatic rock formations consisted of mafic and felsic rocks. Included as mafic LIPs are continental flood basalts, passive volcanic margin and oceanic plateau basalts, giant dyke swarms and large layered intrusions. Mafic LIPs are generally thought to have a mantle plume origin and not directly related to convergent plate boundaries. Felsic LIPs are mainly composed of acidic and acidic-intermediate ignimbrites and genetically related granites. The occurrence of felsic LIPs is considered to be related to underplating of basaltic magma and extension of lithosphere. Further studies on mantle dynamics related with LIPs, the relationship between occurrence of LIPs and continental accretion, breakup,mass extinction as well as metallogenesis are envisaged in the future.