典型文献
Geochemical Variations of the Late Paleozoic Granitoids from the Baolidao Arc-Accrection Belt in Southeastern Segment of Central Asia Orogenic Belt:Implications for Tectonic Transition from Early Carboniferous to Early Permian
文献摘要：
Compositional changes in successively erupted felsic rocks can be used to infer physical changes in lower crustal conditions and to enhance the understanding of the tectonic regime.This study presents geochronological,geochemical and isotopic data for two Ⅰ-type granitic plutons in the Sonid Left Banner of the Central Asian Orogenic Belt.Our new data,together with compiled I-type granitoid data,reveal the presence of magma compositional transition at～305 Ma in the Baolidao arc-accretion belt.The early stage granitoids(330-305 Ma)are medium-K calc-alkaline with higher Sr/Y ratios.The late stage granitoids(305-270 Ma)are high-K calc-alkaline with lower Sr/Y ratios.The two-stage granit-oids have roughly similar predominately positive Sr-Nd-Hf isotope values,but with a decreasing trend from the early to late stages.Geochemical data indicate that the early stage granitoids were generated by dehydration melting of juvenile mafic crust at amphibole-dominated depths.In contrast,the late stage granitoids were produced by dehydration melting of a mixed lithology containing juvenile K-rich mafic lower crust and supracrustal materials at the plagioclase-stable crustal level.We propose that the compo-sitional transition of these granitoids can be linked with different slab behaviors of the northward sub-ducting Paleo-Asian oceanic plate,and also with the back-arc tectonic settings.
文献关键词：
中图分类号：
作者姓名：
Xueni Zhang;Qingdong Zeng;Fengjun Nie
作者机构：
School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China;Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Innovation Academy for Earth Science,Chinese Academy of Sciences,Beijing 100029,China;University of Chinese Academy of Sciences,Beijing 100049,China;Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China
文献出处：
引用格式：
[1]Xueni Zhang;Qingdong Zeng;Fengjun Nie-.Geochemical Variations of the Late Paleozoic Granitoids from the Baolidao Arc-Accrection Belt in Southeastern Segment of Central Asia Orogenic Belt:Implications for Tectonic Transition from Early Carboniferous to Early Permian)[J].地球科学学刊（英文版）,2022(03):719-735
A类：
Granitoids,Baolidao,Accrection,Sonid,granit
B类：
Geochemical,Variations,Late,Paleozoic,from,Arc,Belt,Southeastern,Segment,Central,Orogenic,Implications,Tectonic,Transition,Early,Carboniferous,Permian,Compositional,changes,successively,erupted,felsic,rocks,can,used,infer,physical,lower,conditions,enhance,understanding,tectonic,regime,This,study,presents,geochronological,geochemical,isotopic,data,two,type,granitic,plutons,Left,Banner,Asian,Our,new,together,compiled,reveal,presence,magma,compositional,transition,Ma,arc,accretion,belt,early,granitoids,are,medium,calc,alkaline,higher,Sr,ratios,have,roughly,similar,predominately,positive,Nd,Hf,isotope,values,but,decreasing,trend,stages,indicate,that,were,generated,by,dehydration,melting,juvenile,mafic,amphibole,dominated,depths,In,contrast,produced,mixed,lithology,containing,rich,supracrustal,materials,plagioclase,stable,level,We,propose,these,linked,different,slab,behaviors,northward,sub,ducting,oceanic,plate,also,back,settings
AB值：
0.567738
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