CAJ | 학술논문

伊春市青岭经营所花岗岩具有高硅、富碱和过铝质特点，稀土元素配分模式以轻稀土元素富集且缓向右倾斜、重稀土元素较为平坦、铕略亏损－弱正异常型式，微量元素大离子亲石元素Ba、K、Sr显示为负异常，高场强元素Hf、Zr为正异常，P、Ti、Nb为负异常，岩石地球化学显示S型花岗岩特点。R1－R2图解中样品落入造山晚期，具后碰撞花岗岩特征。中细粒花岗闪长岩锆石U-Pb同位素测年206Pb/238U加权平均年龄为258±3 Ma，细中粒二长花岗岩两个样品锆石206Pb/238U加权平均年龄分别为261±1 Ma、267.3±1.4 Ma，三个样品测年表明花岗岩形成于晚二叠世。该花岗岩的锆石U-Pb年龄的确定和成因的探讨对于深入研究伊春地区晚古生代构造岩浆演化具有十分重要的意义。
이춘시청령경영소화강암구유고규、부감화과려질특점，희토원소배분모식이경희토원소부집차완향우경사、중희토원소교위평탄、유략우손－약정이상형식，미량원소대리자친석원소Ba、K、Sr현시위부이상，고장강원소Hf、Zr위정이상，P、Ti、Nb위부이상，암석지구화학현시S형화강암특점。R1－R2도해중양품락입조산만기，구후팽당화강암특정。중세립화강섬장암고석U-Pb동위소측년206Pb/238U가권평균년령위258±3 Ma，세중립이장화강암량개양품고석206Pb/238U가권평균년령분별위261±1 Ma、267.3±1.4 Ma，삼개양품측년표명화강암형성우만이첩세。해화강암적고석U-Pb년령적학정화성인적탐토대우심입연구이춘지구만고생대구조암장연화구유십분중요적의의。
Qingling Jingyingsuo grantie in Yichun region is characterized by high slica,high alkali,and peralumi-nous grantie.The corordrite-normalized rare earth element(REE)pattern shows light rare earth elements(LREE) enrichment, with a slightly right oblique LREE pattern and a realtive flat HREE one,which constitues a weak pos-itive anomaly curve with Eu nagtive anomaly. Large ion lithophile elements(LILE) such as Ba、K、Sr and P、Ti、Nb show nagtively anomaly while high-field strengh elements such as Hf and Zr show positive anomaly. Litho-geochemical features indicate S type granite, the R1-R2 diagram shows the granite formed in the tectonic environ-ment of late orogenic epoch which has the characteristic of post-tectonic granite.The weighted mean 206Pb/238U age of zircon from medium-fine granodiorite is about 258 ± 3 Ma.The respective weighted mean 206Pb/238U age of zir-con from the two samples of fine-medium monzonitic granite is 267.1 ± 1.4 Ma and 267.3 ± 1.4 Ma, the result shows the grantie formed in Permian Epoch. The U-Pb isotopic age of zircon and the origin of the grantie are of significance for further study of late Paleozoic tectonic and magmatic evolution in Yichun.