Petrogenesis and Tectonic Implications of Peralkaline A-Type Granites and Syenites from the Suizhou-Zaoyang Region,Central China

查看全文 作　　者：Hafizullah Abba [1,2]Ahmed;Changqian [1]Ma;Lianxun [1]Wang;Ladislav [3]A.Palinkas;Musa Bala [1,4]Girei;Yuxiang [1]Zhu;Mukhtar [5]Habib

机构地区：[1]State Key Laboratory of Geological Processes and Mineral Resources,School of Earth Sciences,China University of Geosciences,Wuhan 430074,China;[2]Department of Geology,Modibbo Adama University of Technology,Yola P.M.B.2076,Nigeria;[3]Institute of Mineralogy and Petrology,Faculty of Sciences,University of Zagreb,Zagreb HR-10000,Croatia;[4]Department of Geology,Faculty of Earth and Environmental Sciences,Bayero University,Kano,Nigeria;[5]Department of Mineral and Petroleum Resources Engineering,Kaduna Polytechnic,Kaduna,Nigeria

出　　处：《Journal of Earth Science》索引2018年第29卷第5期,共22页

基　　金：the support from the National Natural Science Foundation of China(No.41502046);partial financial support by the China Geological Survey(No.DD20160030;the Fundamental Research Funds for the Central Universities,China University of Geosciences,Wuhan(No.CUGCJ1711) 摘　　要：In this study, we present systematic petrological, geochemical, LA-ICP-MS zircon U-Pb ages and Nd isotopic data for the A-type granites and syenites from Suizhou-Zaoyang region. The results show that the peralkaline A-type granites and syenites were episodically emplaced in Suizhou-Zaoyang region between 450±3 and 441±7 Ma which corresponds to Late Ordovician and Early Silurian periods, respectively. Petrologically, the syenite-peralkaline granite association comprises of nepheline normative-syenite and alkaline granite in Guanzishan and quartz normative syenite and alkaline granite in Huangyangshan. The syenite-granite associations are ferroan to alkali in composition. They depict characteristics of typical OIB(oceanic island basalts) derived A-type granites in multi-elements primitive normalized diagram and Yb/Ta vs. Y/Nb as well as Ce/Nb vs. Y/Nb binary plots. Significant depletion in Ba, Sr, P, Ti and Eu indicates fractionation of feldspars, biotite, amphiboles and Ti-rich augite. The values of ?Nd(t) in Guanzishan nepheline syenite and alkaline granite are +1.81 and +2.26, respectively and the calculated two-stage model age for these rocks are 1 040 and 1 003 Ma, respectively. On the other hand, the Huangyangshan alkaline granite has ?Nd(t) values ranging from +2.61 to +3.46 and a relatively younger two-stage Nd model age values ranging from 906 to 975 Ma, respectively. Based on these data, we inferred that the Guanzishan nepheline syenites and granites were formed from fractional crystallization of OIB-like basic magmas derived from upwelling of metasomatized lithospheric mantle. The Huangyangshan quartz syenite and granite on the other hand, were formed from similar magmas through fractional crystallization with low input from the ancient crustal rocks. Typically, the rocks exhibit A1-type granite affinity and classified as within plate granites associated with the Ordovician crustal extension and the Silurian rifting. 关键词：霞石正长岩花岗石类型 LA-ICP-MS 构造华中二进制代码岩石学

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Petrogenesis and Tectonic Implications of Peralkaline A-Type Granites and Syenites from the Suizhou-Zaoyang Region,Central China

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