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Geochemistry,Geochronology and Geological Significance of Gufengshan Granodiorite in Linfen Grabben Basin

QI Yue,XU Hongbo,ZHANG Jingxiong,LUO Jinhai State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi'an,710069  
The Gufengshan granodiorite makes up the Gufeng Mountain,is located in the Linfen grabben Basin,belongs to high-K calc-alkaline series,and SiO2 varying in the range of 64.62%~65.57%,has the features of high alkali(Na2O+K2O=7.38%~7.71%),high Na(Na2O/K2O=1.37~1.54),A/CNK=0.94~0.99,which falls into the range of metaluminous rocks,and low magnesium index(Mg#=31.8~36.2).The rock is riched in LREE [(La/Yb)N=17.0~19.3],with little Eu anomalies(δEu=0.94~1.04),riched in LILE K,Rb,Ba,Sr et al.,high Sr/Y(Sr/Y=59.3~67.2) and flatter HFSE Nb,Ta,Ti,Y.Petrological and geochemical characteristics indicate the granodiorite results from the partial melting of thickening mafic lower crust.Zircons from these rocks are used in LA-ICP-MS U-Pb dating,yielding a weighted mean 206Pb/238U age of 132.2 9.2Ma,which is consistent with the peak time of the lithospheric thinning and the destruction of the North China Block.The core of some zircons with the age of 2590.9Ma shows that some corresponding tectonic events happened in Neoarchean.Based on the regional geological data analysis,the Gufengshan granodiorite is the product of the extension being coetaneous to the peak period of the lithospheric thinning and destruction of North China Block,and such lithospheric thinning and destruction happened in the Early Cretaceous in North China block affected westwards the Linfen grabben basin region on the west Taihang Mountains.
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