现代地质2017，Vol.31Issue(4)：705-715,11.
豫西崤山后河岩体的地球化学及锆石稀土元素特征
Geochemical Characteristics and Zircon Rare Earth Elements of Houhe Intrusive Complex in Xiaoshan Mountain, Western Henan Province
摘要
Abstract
The endogenetic mineralization in north Xiaoshan Mountain is weak,and only several Au deposits were found.The petrogenesis of small Yanshanian igneous complexes in north Xiaoshan Mountain is useful to limit the deep geodynamic process,and it is an important evidence to change exploration ideal.In this paper,major and trace elements analytical results of whole rock samples and zircon REEs from Houhe complex were reported.Houhe complex is characterized by higher SiO2 content and alkali enrichment in K2O,lower MgO and CaO content.Compositional spots of Houhe complex fell into shoshonitic series in SiO2-K2O diagram.A/CNK ratios of Houhe complex are from 1.04 to 1.26.In chondrite-normalized REE pattern diagram,Houhe complex samples have shown the characteristics of LREE enrichment and HREE depletion without obvious Eu anomaly.The (La/Yb)N ratios of Houhe complex are from 30.95 to 49.38.In spider diagram,the enrichment of Rb,Th,and depletion of Nb,Ta,P and Ti are displayed.Samples of Houhe complex are higher in Sr,and lower in Y and Yb,which indicates that it is adakite.Houhe complex is originated from partial melting of the thickened lower crust,and its residual phases of partial melting source include garnet and rutile.There is no obviously compositional effect of plagioclase fractional crystallization in the process of Houhe granitic magma evolution.Rare earth element content of zircon in Houhe complex has shown the characteristics of LREE depletion,HREE enrichment with Ce positive anomaly and no obvious Eu anomaly.The formation temperature of zircon is from 624 to 701 C.In zircon/melts system of Houhe complex,the change of partition coefficients for HREE is a result of magma (fluids) mixing.Houhe complex is product of regional lithosphere delamination in Early Cretaceous;deep fluids and adakitic magma can ascend rapidly in this process.The occurrence of Shenjiayao Au deposits around Houhe complex and the enrichment of Au,Ag,Cu,Mo and W in Houhe complex indicate that it has mineralization potential,and it should be regarded as one of exploration targets in north Xiaoshan Mountain.关键词
后河/埃达克岩/岩石圈拆沉/岩浆(流体)混合/成矿潜力/崤山Key words
Houhe/adakite/lithosphere delamination/magma (fluid) mixing/mineralization potential/Xiaoshan Mountain分类
天文与地球科学引用本文复制引用
梁涛,卢仁..豫西崤山后河岩体的地球化学及锆石稀土元素特征[J].现代地质,2017,31(4):705-715,11.基金项目
国家自然科学基金项目(U1504405) （U1504405）
河南省科技计划项目(162300410065) （162300410065）
河南省国土资源厅科技攻关项目(2016-08,2014-06,2011-622-25和2011-622-36). （2016-08,2014-06,2011-622-25和2011-622-36）
