典型文献
Petrogenesis and tectonic implications of the Early Cretaceous Dagushan adakitic porphyries in the Anshan area,North China Craton
文献摘要：
The eastern part of the North China Craton suffered significant lithospheric thinning since the Meso-zoic,and petrogenesis of the Dagushan adakitic diorite porphyries provides an excellent opportunity to investigate the lithospheric thinning mechanism and geodynamic set-ring.The zircon LA-ICP-MS U-Pb geochronology reveals that the representative Dagushan adakitic porphyry was formed at 120.5 ± 0.5 Ma.The Dagushan diorite por-phyries are characterized by the relatively high contents of SiO2 (64.25-65.70 wt％),Al2O3 (15.00-15.38 wt％),Sr(333-491 ppm),low contents of Y (6.50-10.3 ppm),and Yb (0.57-0.85 ppm),and resultant high Sr/Y (47-57) and La/Yb (37-55) ratios,exhibiting geochemical characteris-tics of typical adakites.Moreover,the relatively high MgO contents (MgO =2.23-2.29 wt％) and Mg numbers (Mg#-=54-56) of the Dagushan adakitic rocks imply that the pristine adakiric magma interacted with mantle peridotite.However,the zircon Hf isotopic signatures (εHf(t)=-19.0 to-28.0;TDM2 =2378-2944 Ma) suggest an ancient lower crustal source.Therefore,it is proposed that the Dagushan adakitic rock was probably generated by partial melting of delaminated lower crust which was triggered by the Tan-Lu Fault Zone,and the interaction of pristine adakitic magma with mantle peridotite during the ascent finally generated the Dagushan high Mg# adakitic rocks.It is suggested that delamination was an important mecha-nism for lithospheric thinning of the NCC.
文献关键词：
中图分类号：
作者姓名：
Xiaohui Sun;Haoshu Tang;Yan Luan
作者机构：
Key Laboratory of Western China's Mineral Resources and Geological Engineering,MOE,School of Earth Science and Resources,Chang'an University,Xi'an 710054,China;State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China
文献出处：
引用格式：
[1]Xiaohui Sun;Haoshu Tang;Yan Luan-.Petrogenesis and tectonic implications of the Early Cretaceous Dagushan adakitic porphyries in the Anshan area,North China Craton)[J].地球化学学报（英文版）,2022(01):24-38
A类：
Dagushan,Anshan,phyries,adakites,adakiric
B类：
Petrogenesis,tectonic,implications,Early,Cretaceous,adakitic,porphyries,area,North,China,Craton,eastern,suffered,significant,lithospheric,thinning,since,Meso,zoic,petrogenesis,diorite,provides,excellent,opportunity,investigate,mechanism,geodynamic,set,zircon,LA,ICP,Pb,geochronology,reveals,that,representative,porphyry,was,formed,Ma,characterized,by,relatively,high,contents,SiO2,wt,Al2O3,Sr,ppm,Yb,resultant,La,ratios,exhibiting,geochemical,characteris,tics,typical,Moreover,MgO,numbers,Mg#,rocks,imply,pristine,magma,interacted,mantle,peridotite,However,Hf,isotopic,signatures,TDM2,ancient,lower,crustal,source,Therefore,proposed,probably,generated,partial,melting,delaminated,which,triggered,Tan,Lu,Fault,Zone,interaction,during,ascent,finally,It,suggested,delamination,important,NCC
AB值：
0.501008
相似文献
机标中图分类号，由域田数据科技根据网络公开资料自动分析生成，仅供学习研究参考。
