首页|The Origin of Mesozoic A-type Granitoids,Fujian Province,Southeast China:Insights from Geochronology,Mineralogy and Geochemistry
The Origin of Mesozoic A-type Granitoids,Fujian Province,Southeast China:Insights from Geochronology,Mineralogy and Geochemistry
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The magma sources,origins and precise forming ages of the miarolite from Qishan and Kuiqi intrusions are still uncertain.New results reveal that,miarolites from the Qishan and Kuiqi intrusions yield crystallization ages of～101 and～98 Ma,and they have a high formation temperature(～910℃)and low oxygen fugacity value,indicating crystallization condition at low pressure in the upper crust with temperature of 678℃.The Qishan and Kuiqi miarolites are characterized by enrichment in SiO2 and high-K alkali,depletion in Ca and Mg,and belong to the high-K weak peraluminous rock series.The samples are enriched in HFSEs(i.e.,Ta,Zr and Hf)and LILEs(i.e.,Ba,P and Sr),depleted in Ba and Sr with the negative anomaly of Eu.In the primitive mantle normalized trace element spider diagram,the samples show a right-inclined'seagull-type'pattern,combined the ratios of(La/Yb)N,10000 × Al/Ga,Rb/Nb and Nb/Ta etc.,they were proved to be alkaline A-type granite.Combined the characterize of the trace elements,they were derived from clay-rich source accompanied pelite melting,and subjected to K-feldspar crystallization fractional.The values of εHf(t)and tDM2 are distributed in the range of-2.8 to 3.3 with～1.2 Ga,and-6.0 to 4.0 with～1.2 Ga,revealing that they were generated from the Mesoproterozoic Cathaysia basement rocks.The comprehensive research reveals the Kuiqi and Qishan intrusions derived from crust-mantle mixing and partial melting of the crust,respectively,resulting from lithospheric extension generated by the Paleo-Pacific Plate subducted into the European-Asian Plate.
A-type granitoidgeochronologyextensionsubductionMesozoicSoutheast China
XIE Qifeng、DONG Yunpeng、CAI Yuanfeng、ZHAI Mingguo、XIAO Aifang、ZHANG Hong
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Zijin School of Geology and Mining,Fuzhou University,Fuzhou 350108,China
State Key Laboratory of Continental Dynamics,Northwest University,Xi'an 710069,China
State Key Laboratory for Mineral Deposits Research,Nanjing University,Nanjing 210023,China
State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 10029,China
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Opening Foundation of State Key Laboratory of Continental Dynamics,Northwest University
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