北秦岭宝鸡地区早志留世鸡冠崖高分异碰撞型花岗岩年龄、地球化学特征及地质意义
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摘要
对北秦岭宝鸡地区鸡冠崖花岗岩进行了LA-ICP-MS锆石U-Pb年代学和岩石地球化学研究。结果显示,锆石206Pb/238Pb加权平均年龄为(435±2)Ma(MSWD=0.13,n=22),限定该岩体的形成时代为早志留世。鸡冠崖花岗岩具有高硅(w(SiO2)=72.77%~77.71%)、富钾(w(K2O)=3.51%~6.32%)、低铁(w(Fe2OT3)=0.71%~1.30%,Fe2OT3/MgO=2.71~7.29)、低镁(w(MgO)=0.14%~0.31%)、低磷(w(P2O5)=0.05%~0.10%)的特征,A/CNK=0.94~1.10,AR=2.95~4.10,属准铝质至弱过铝质、钙碱性系列。鸡冠崖花岗岩稀土元素质量分数较低(32×10-6~102×10-6),铕异常明显(δEu=0.22~13.83),富集Rb、U、Th、Nd、Zr、Hf等微量元素,贫Ba、Nb、P、Ti等元素,分异程度较高(DI=89~93),整体表现出高分异I型花岗岩特征。结合区域资料,认为鸡冠崖花岗岩形成于同碰撞构造环境,为下地壳物质部分熔融成因。
Jiguanyagranite is located in Baoji area of North Qinling Orogen,and its LA-ICP-MS zircon UPb geochronological and petrogeochemical data are determined in this paper.The results show that the zircon 206 Pb/238 Pb weighted average age of Jiguanyagranite is(435±2)Ma(MSWD=0.13,n=22),indicating that the granite formed in Early Silurian.Jiguanyagranite has high SiO2(72.77%-77.71%),K2 O(3.51%-6.32%),and low Fe2 OT3(0.71%-1.30%,Fe2 OT3/MgO=2.71-7.29),MgO(0.14%-0.31%)and P2 O5(0.05%-0.10%)contents,and belongs to calc-alkaline series with metaluminous/peraluminous feature(A/CNK=0.94-1.10,AR=2.95-4.10).In addition,the graniteis poor in total REE contents(32×10-6-102×10-6),with obvious Eu anomalies(δEu=0.22-13.83).The trace elements show the enrichment in Rb,U,Th,Nd,Zr and Hf,and the depletion in Ba,Nb,Ce,P and Ti,with geochemical characteristics of the highly fractionated syn-collisional granites.Combined with regional data,the Jiguanyagranite was formed in the syn-orogenic tectonic setting,and derived from partial melting of low crust materials.
Jiguanyagranite is located in Baoji area of North Qinling Orogen,and its LA-ICP-MS zircon UPb geochronological and petrogeochemical data are determined in this paper.The results show that the zircon 206 Pb/238 Pb weighted average age of Jiguanyagranite is(435±2)Ma(MSWD=0.13,n=22),indicating that the granite formed in Early Silurian.Jiguanyagranite has high SiO2(72.77%-77.71%),K2 O(3.51%-6.32%),and low Fe2 OT3(0.71%-1.30%,Fe2 OT3/MgO=2.71-7.29),MgO(0.14%-0.31%)and P2 O5(0.05%-0.10%)contents,and belongs to calc-alkaline series with metaluminous/peraluminous feature(A/CNK=0.94-1.10,AR=2.95-4.10).In addition,the graniteis poor in total REE contents(32×10-6-102×10-6),with obvious Eu anomalies(δEu=0.22-13.83).The trace elements show the enrichment in Rb,U,Th,Nd,Zr and Hf,and the depletion in Ba,Nb,Ce,P and Ti,with geochemical characteristics of the highly fractionated syn-collisional granites.Combined with regional data,the Jiguanyagranite was formed in the syn-orogenic tectonic setting,and derived from partial melting of low crust materials.
引文
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