摘要
Raobazhai ultramafic rock(RUR)consists mainly of harzburghe.Their two distinctcharacteristics are:(i)mylonitization of harzburgite is quite strong;(ii)metasomatism of mantle is developed.Trace element,REE,Nd-and Sr-isotope geochemistry show that the RUR is much similar to that ofcontinental lithospheric mantle(CLM)rather than oceanic lithospheric mantle(OLM).Melt composition cal-culated by cumulate demonstrates that the characteristics of island are basalt,which implies that the source ofmantle flow might be related to the subduction process.It is possible that RUR represents a remmantof CLM above the Proterozoic subduction zone.
Raobazhai ultramafic rock(RUR)consists mainly of harzburghe.Their two distinct characteristics are:(i)mylonitization of harzburgite is quite strong;(ii)metasomatism of mantle is developed. Trace element,REE,Nd-and Sr-isotope geochemistry show that the RUR is much similar to that of continental lithospheric mantle(CLM)rather than oceanic lithospheric mantle(OLM).Melt composition cal- culated by cumulate demonstrates that the characteristics of island are basalt,which implies that the source of mantle flow might be related to the subduction process.It is possible that RUR represents a remmant of CLM above the Proterozoic subduction zone.
基金
the National Natural Science Foundation of China
