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《Geochimica》 2007-06
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Magma recording of Paleoproterozoic orogeny in central segment of northern margin of North China Craton:Geochemical characteristics and zircon SHRIMP dating of S-type granitoids

ZHONG Chang-ting1 ,DENG Jin-fu2,WAN Yu-sheng3,MAO De-bao1 and LI Hui-min1 1.Tianjin Institute of Geology and Mineral Resources,China Geological Survey,Tianjin 300170,China; 2.School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China; 3.Beijing SHRIMP Center,Institute of Geology,Chinese Academy of Geological Science,Beijing 100037,China  
There are many Paleoproterozoic S-type granitoid intrusions distributing along Jining-Liangcheng-Qianlishan in the central segment of northern margin of North China Craton,and they are mainly strongly peraluminous granitoids(SPGs),and a few are metaluminous granitoids.Most of the S-type granitoid rocks have lower SiO2 contents(mainly less than 74% ),lower Al2O3/TiO2 ratios( 100) and Rb/Sr ratios as well as Rb/Ba ratios,but higher CaO/Na2O ratios( 0.3).The REEs and trace elements are very complex,for example,some samples are characterized by positive Eu anomalies,some by negative Eu anomalies and others by weak Eu anomalies,but all samples are moderate LREE enrichment.This kind of geochemistry characteristic suggests that the S-type granitoids were generated by melting of psammites(meta-graywackes) that aggraded in active plate margin like forearc basin,with hot and deep source,and it is like the S-type granitoids in Lachlan orogenic belts,Australia.After dating the strongly peraluminous granitoid intrusions distributing from the center to margin by zircon SHRIMP U-Pb technique,it is suggested that SPGs were formed at(1921± 16) Ma to(1904± 10) Ma,and it represented one orogeny time in Paleoproterozoic in North China Craton.
【Fund】: 国家自然科学基金(40573037);; 国土资源部“创新人才工程”百人计划项目;; 国土资源部资源补偿费项目
【CateGory Index】: P588.121;P597.3
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