The Dupal anomaly has attracted widespread attention since being discovered and is regarded as the most direct manifestation of mantle inhomogeneity at present. From the initially defined anomalies limited to the southern hemisphere to the global scale, the criteria for identifying anomalies defined by Pb isotopes have also been adjusted, providing an important method and reference for the study of the mantle evolution. Pearce and Peate (1995) proposed the method of Nd-Hf isotope and element ratio to identify the Dupal anomaly. The Nd-Hf method also offers a possible way to discriminate the mantle region of arc magmatism through the correction of Nd in the subduction process. This paper introduces the concepts and determination methods of the Dupal anomaly, and reports new Hf isotopic data of MORB-type rocks with Dupal signature in the several Tethys ophiolites. Our results of Nd-Hf method are in good agreement with those of previous Pb isotope identification. Moreover, origins and their controversy of Dupal anomaly are reviewed, and possible internal connections between Dupal anomalies and the two Large Low Shear Velocity Provinces (LLSVPs) in the lower mantle are discussed in depth. Further studies on origin and evolution of the Dupal anomaly are suggested, especially using integrated approach of Hf-Nd and Pb isotopes.

TIAN Ye;XU Jifeng;LIU Xijun

School of Earth Science and Resources,and State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing 100083,China;Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration,College of Earth Sciences,Guilin University of Technology,Guilin,Guangxi 541004,China

地质学报（英文版）

[1]TIAN Ye;XU Jifeng;LIU Xijun-.Dupal Anomaly and Identification using Nd-Hf Isotopes)[J].地质学报（英文版）,2022(02):416-429

Dupal,Peate

Anomaly,Identification,using,Nd,Hf,Isotopes,anomaly,has,attracted,widespread,attention,since,being,discovered,regarded,most,direct,manifestation,mantle,inhomogeneity,present,From,initially,defined,anomalies,limited,southern,hemisphere,global,scale,criteria,identifying,by,Pb,isotopes,have,also,been,adjusted,providing,important,reference,study,evolution,Pearce,proposed,element,ratio,offers,possible,way,discriminate,region,magmatism,through,correction,subduction,process,This,paper,introduces,concepts,determination,methods,reports,new,isotopic,data,MORB,type,rocks,signature,several,Tethys,ophiolites,Our,results,are,good,agreement,those,previous,identification,Moreover,origins,their,controversy,reviewed,internal,connections,between,two,Large,Low,Shear,Velocity,Provinces,LLSVPs,lower,discussed,depth,Further,studies,suggested,especially,integrated,approach

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