摘要
科马提岩仅限于超镁铁质熔融体(Mgo>30wt%)所生成的火山岩.它具有高温、高密度和低粘度的特征.以及独特的地球化学性质.结合高压熔融实验成果,评述了有关科马提岩成因的干地幔熔融模式、湿地幔熔融模式、温超镁铁质板块俯冲模式和热地幔柱熔融模式,并认为热地幔柱熔融模式较好地解释了科马提岩的成因.
Komatiites are defined as lavas derived from ultramafic melts (MgO>30wt%). The melts has the characteristics of high temperature,high density and low viscosity,as well as distinctive geochemistry. Based on the melting experimental results at high pressures,in the paper the models of dry mantle melting, wet mantle melting,wet ultramafic plate subduction and hot mantle plume melting forming the related komatiites are discussed, and the model of hot mantle plume is thought to be the better one to explain the origin of komatiites.
出处
《矿产与地质》
1993年第2期94-101,共8页
Mineral Resources and Geology
关键词
科马提岩
成因
火山岩
Komatiites,Dry mantle melting model,Wet mantle melting model,Wet ultramafic plate subduction model, Hot mantle plume melting model
