| 大兴安岭北段伊勒呼里山晚侏罗世二长花岗岩LA-ICP-MS锆石U-Pb年龄、地球化学特征及其地质意义 |
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| 引用本文： | 尹志刚,宫兆民,张跃龙,曹忠强,李敏,李海娜,王阳,韩宇,张圣听.大兴安岭北段伊勒呼里山晚侏罗世二长花岗岩LA-ICP-MS锆石U-Pb年龄、地球化学特征及其地质意义[J].地质通报,2018,37(7):1291-1301. |
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| 作者姓名： | 尹志刚 宫兆民 张跃龙 曹忠强 李敏 李海娜 王阳 韩宇 张圣听 |
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| 作者单位： | 辽宁工程技术大学矿业学院;黑龙江省地质调查研究总院齐齐哈尔分院 |
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| 基金项目： | 中国地质调查局项目《黑龙江省1：5万1147高地（M51E004015）、工队（M51E004016）、1302高地（M51E005015）、1070高地（M51E005016）幅区调》（编号：1212011120659） |
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| 摘 要： | 对大兴安岭北段伊勒呼里山地区二长花岗岩进行了LA-ICP-MS锆石U-Pb年龄和岩石地球化学研究,确定其形成时代、岩石成因,揭露区域大地构造环境。测年数据显示,二长花岗岩于158.1±0.7Ma前形成,为晚侏罗世早期岩浆演化事件的产物。地球化学结果显示,二长花岗岩具有高Si、富Na、K、Al,低Fe、Mg的特点,A/CNK值为0.83~1.09,属高钾钙碱性花岗岩;富集大离子亲石元素K、Rb,贫高场强元素Hf、Th;稀土元素总量较高,稀土元素配分曲线右倾,具弱的负Eu异常,为Ⅰ型花岗岩。岩浆起源于下地壳玄武质成分的岩石部分熔融,为同碰撞期陆壳加厚过程的产物。研究区晚侏罗世早期二长花岗岩的形成与蒙古-鄂霍茨克缝合带闭合过程中的陆-陆碰撞环境有关,其形成时代限定了大兴安岭北段伊勒呼里山地区蒙古-鄂霍茨克洋的闭合时间应为晚侏罗世早期。
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| 关 键 词： | 晚侏罗世早期 二长花岗岩 地球化学 蒙古-鄂霍茨克洋 伊勒呼里山 |
| 收稿时间： | 2017/4/24 0:00:00 |
| 修稿时间： | 2017/10/15 0:00:00 |
LA-ICP-MS zircon U-Pb dating and geochemical characteristics of the Late Jurassic monzonitic granite from Yilehuli Mountain in northern Da Hinggan Mountains and their geological implications |
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| YIN Zhigang,GONG Zhaomin,ZHANG Yuelong,CAO Zhongqiang,LI Min,LI Hain,WANG Yang,HAN YU and ZHANG Shengting.LA-ICP-MS zircon U-Pb dating and geochemical characteristics of the Late Jurassic monzonitic granite from Yilehuli Mountain in northern Da Hinggan Mountains and their geological implications[J].Geologcal Bulletin OF China,2018,37(7):1291-1301. |
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| Authors: | YIN Zhigang GONG Zhaomin ZHANG Yuelong CAO Zhongqiang LI Min LI Hain WANG Yang HAN YU and ZHANG Shengting |
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| Institution: | Liaoning Technical University, Fuxin 123000, Liaoning, China,Liaoning Technical University, Fuxin 123000, Liaoning, China,Qiqihar Branch of Heilongjiang Institute of Geological Survey, Qiqihar 161005, Heilongjiang, China,Liaoning Technical University, Fuxin 123000, Liaoning, China,Liaoning Technical University, Fuxin 123000, Liaoning, China,Liaoning Technical University, Fuxin 123000, Liaoning, China,Liaoning Technical University, Fuxin 123000, Liaoning, China,Liaoning Technical University, Fuxin 123000, Liaoning, China and Liaoning Technical University, Fuxin 123000, Liaoning, China |
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| Abstract: | LA-ICP-MS zircon U-Pb geochronologic study and whole-rock geochemical analysis were undertaken for the monzonitic granite in Yilehuli Mountain area in northern Da Hinggan Mountains, with the aim of constraining its formation time, petrogenesis and the regional tectonic setting. Dating data show that monzonitic granite formed at 158.1 ±0.7 Ma before the Late Jurassicearly magmatic evolution event. The geochemical studies show that the granite in the area has the characteristics of high Si, Na, K and Al and low Fe and Mg, with A/CNK being 0.83~1.09, thus belonging to high potassium calc alkaline granite; it is enriched in the large ion lithophile elements K, Rb, and depleted in high field strength elements Hf, Th; the total REE is higher, and the rare earth distribution curve is right-inclined, with weak negative Eu anomalies. According to these characteristics, the monzonitic granite should belong to type I granite. The magma originated from the rock melting of the of the basaltic components of the lower crust, being the product of the thickening process with the crust during the collision. The formation of the early Late Jurassic monzonitic granites in the study area were related to the continental-continental collision environment in the closure process of the Mongolian-Okhotsk suture zone, and the closing time of the Mongolia Okhotsk Ocean in North Da Hinggan Mountain-Yilehuli mountain area is also confined to early Late Jurassic. |
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| Keywords: | early Late Jurassic monzonitic granite geochemistry Mongol-Okhotsk Ocean Yilehuli Mountain |
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