| 大兴安岭中段扎赉特旗地区满克头鄂博组火山岩锆石U-Pb年龄及地球化学特征 |
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| 引用本文： | 臧延庆,秦涛,孙巍,马永非,买廷成,司秋亮,汪岩,谭红艳.大兴安岭中段扎赉特旗地区满克头鄂博组火山岩锆石U-Pb年龄及地球化学特征[J].地质通报,2018,37(9):1644-1651. |
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| 作者姓名： | 臧延庆 秦涛 孙巍 马永非 买廷成 司秋亮 汪岩 谭红艳 |
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| 作者单位： | 中国地质调查局沈阳地质调查中心;吉林大学地球科学学院 |
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| 基金项目： | 中国地质调查局项目《内蒙古1∶5万五家户、孟家沟、莫利根屯、扎赉特旗、巴彦高勒五幅区域地质调查》（编号：DD20160048-03） |
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| 摘 要： | 对大兴安岭中段扎赉特旗地区满克头鄂博组火山岩进行了锆石U-Pb年龄和地球化学研究。用LA-ICP-MS测得流纹质隐爆角砾岩(TW6)和流纹岩(TW14)中锆石的~(206)Pb/~(238)U年龄分别为157.2±1.2Ma和154.8±1.1Ma,表明火山岩形成于晚侏罗世。岩石地球化学特征表明,火山岩富硅碱、贫钙镁,为过铝质钙碱性系列;(La/Yb)_N=20.24~22.68,轻、重稀土元素分馏明显;球粒陨石标准化稀土元素配分模式图呈右倾形式,Eu为正异常;原始地幔标准化蛛网图显示,大离子亲石元素Rb、K相对富集,高场强元素Nb、Ti、P强烈亏损,显示壳源岩浆的特征。综合本区火山岩的特征并结合他人研究成果,认为扎赉特旗地区满克头鄂博组火山岩的形成与蒙古-鄂霍次克洋闭合后伸展作用关系密切。
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| 关 键 词： | LA-ICP-MS锆石U-Pb年龄 地球化学 满克头鄂博组 大兴安岭中段 扎赉特旗 |
| 收稿时间： | 2018/3/20 0:00:00 |
| 修稿时间： | 2018/6/27 0:00:00 |
Zircon U-Pb age and geochemistry of volca-nic rocks in Manketouebo Formation from Jalaid Banner, central Da Hinggan Mountains |
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| ZANG Yanqing,QIN Tao,SUN Wei,MA Yongfei,MAI Tingcheng,SI Qiuliang,WANG Yan and TAN Hongyan.Zircon U-Pb age and geochemistry of volca-nic rocks in Manketouebo Formation from Jalaid Banner, central Da Hinggan Mountains[J].Geologcal Bulletin OF China,2018,37(9):1644-1651. |
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| Authors: | ZANG Yanqing QIN Tao SUN Wei MA Yongfei MAI Tingcheng SI Qiuliang WANG Yan and TAN Hongyan |
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| Institution: | Shenyang Geological Survey Center, CGS, Shenyang 110034, Liaoning, China,Shenyang Geological Survey Center, CGS, Shenyang 110034, Liaoning, China;College of Geosciences, Jilin University, Changchun 130061, Jilin, China,Shenyang Geological Survey Center, CGS, Shenyang 110034, Liaoning, China,Shenyang Geological Survey Center, CGS, Shenyang 110034, Liaoning, China;College of Geosciences, Jilin University, Changchun 130061, Jilin, China,Shenyang Geological Survey Center, CGS, Shenyang 110034, Liaoning, China,Shenyang Geological Survey Center, CGS, Shenyang 110034, Liaoning, China,Shenyang Geological Survey Center, CGS, Shenyang 110034, Liaoning, China and Shenyang Geological Survey Center, CGS, Shenyang 110034, Liaoning, China |
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| Abstract: | Chronologic and geochemical studies of volcanic rocks in Manketouebo Formation from Jalaid Banner area are presented in this paper. The zircon U-Pb dating results show that the ages of rhyolitic breccia (TW6) and rhyolite (TW14) are 157.2±1.2Ma (MSWD=0.33,n=22) and 154.8±1.1Ma (MSWD=0.34,n=28) respectively, indicating that the volcanic rocks were formed in Late Ju-rassic. Geochemical characteristics indicate that the volcanic rocks are rich in silicon and alkali but poor in calcium and magnesium, and belong to peraluminous calc-alkali series. The chondrite-normalized REE patterns indicate that the volcanic rocks are enriched in light rare earth elements with significant fractionation of HREE and LREE ((La/Yb)N=20.24-22.68), and Eu has a positive anoma-ly. The primitive mantle-normalized trace element spidergram shows that the volcanic rocks contain high LILE(Rb, K) and low HFSE (Nb, Ti, P), suggesting crust magma source. In combination with all the characteristics of the volcanic rocks and other re-search results, the authors hold that the volcanic rocks in Manketouebo Formation were closely related to the lithosphere extension af-ter the closure of Mongol-Okhotsk Ocean. |
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| Keywords: | LA-ICP-MS zircon U-Pb age geochemistry Manketouebo Formation central Da Higgan Mountains Jalaid Ban-ner area |
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