| The Sanfengsi granitic pluton is a Metamorphic deformation granitic pluton which disintegrated from Dengfeng complex rock.This study enriches the geological data of the Songshan area.?1?The Sanfengsi pluton of 14m2 is distributed in the Sanfengsi of the Songshan.Sanfengsi pluton with the features of Tonalite,main mineral plagioclase,potassium feldspar,quartz and few biotite.?2?The main elements and trace element show high aluminum TTG rock characteristics of hhe Sanfengsi granitic pluton:high Na2O?Na2O/K2O>1?and SiO2?70.32%72.02%?contents,low FeOT,MgO and TiO2 contents?FeOT+MgO+TiO2=3.205.20?.The source area composition and magmatism process result high-silicon and low-potassium characteristics of the Sanfengsi pluton compared with other Neoarcheantic rock masses in Songshan area.The pluton have high Sr contents(299.26×10-6761.00×10-6)and Sr/Y ratios?24.2288.59?,but have low Yb contents(0.63×10-61.44×10-6).The total amount of REE in rock mass is low,light rare earth is relatively rich,while heavy rare earth is depleted.These indicate that the Sanfengsi piuton may have formed in an island or a continent marginal arc?3?U-Pb dating of zircons results in an age of 2569±52Ma?MSWD=5.0?.Based on the age data measured by previous researchers and the relationship between the Sanfengsi pluton and the surrounding rocks,the Sanfengsi pluton may intrusive the Neoarchean period.?4?Combining with its geological and geochemical characteristics,the sanfengsi pluton may have formed by partial melting of a subducted basaltic slah in the residual magmas?above 10 kbar?. |
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