Systematical analyses of data from GEOROC and PetDB database show that large amount of Cenozoic andesites occurred in the various oceanic environments such as mid-oceanic ridge,plume-related island and oceanic arc.In this study,we employed the geochemical data of 351 mid-ocean ridge andesites(MORA),2 539 plume-related andesites(PRA)and 3 488 oceanic arc andesites(OAA)from the database to discuss the relationship between andesite tectonic settings and their geochemical features,thereby making an attempt to construct tectonic discrimination diagrams.Based on the data-driven pattern,all available elements were employed to derive logratios for the possible coordinates,and the overlap-rate calculation was adopted to evaluate the discrimination effect of more than 330 000 prospec-tive diagrams.Finally,four tectonic discrimination diagrams have been successfully established to identi-fy MORA,PRA and OAA,which can be utilized to identify the original settings of andesite with an age range from Cenozoic to Archean a certain extent.Of these diagrams,PRA is mainly distinguished by high LREE/HREE ratio due to enriched mantle source.Whereas,OAA is mainly characterized by high LILE/HFSE ratio,which reveals that fluids derived from subducted slab play an important role in form-ing oceanic arc andesites.Consequently,the petrogenesis of andesites is closely related to their tectonic settings.However,it should be noted that those andesites formed in both continental and oceanic environ-ments cannot be effectively distinguished using these diagrams.We strongly recommend integrating the discrimination diagrams result with other geological information to reach a comprehensive interpreta-tion of evolution history with those ancient andesites.This paper presents a case study which suggests that data-driven method is a powerful tool for solving geological problems in this'big data'era.

Xinyu Liu;Qi Zhang;Chengli Zhang

State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi'an 710069,China;Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China

地球科学学刊（英文版）

[1]Xinyu Liu;Qi Zhang;Chengli Zhang-.Identification of the Original Tectonic Setting for Oceanic Andesite Using Discrimination Diagrams:An Approach Based on Global Geochemical Data Synthesis)[J].地球科学学刊（英文版）,2022(03):696-705

Andesite,PetDB,MORA,logratios,prospec

Identification,Original,Tectonic,Setting,Oceanic,Using,Discrimination,Diagrams,Approach,Based,Global,Geochemical,Data,Synthesis,Systematical,analyses,from,GEOROC,database,show,that,large,amount,Cenozoic,andesites,occurred,various,oceanic,environments,such,mid,ridge,plume,related,island,arc,In,this,study,employed,geochemical,PRA,OAA,discuss,relationship,between,tectonic,settings,their,features,thereby,making,attempt,construct,discrimination,diagrams,driven,pattern,available,elements,were,possible,coordinates,overlap,rate,calculation,was,adopted,evaluate,more,than,Finally,four,have,been,successfully,established,which,utilized,identify,original,age,range,Archean,certain,extent,Of,these,mainly,distinguished,high,LREE,HREE,due,enriched,mantle,source,Whereas,characterized,LILE,HFSE,reveals,fluids,derived,subducted,slab,play,important,role,Consequently,petrogenesis,closely,However,should,noted,those,formed,both,continental,cannot,effectively,using,We,strongly,recommend,integrating,result,other,geological,information,reach,comprehensive,interpreta,evolution,history,ancient,This,paper,presents,case,suggests,method,powerful,tool,solving,problems,big,era

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