| 大兴安岭中段白音高老组火山岩的形成时代及地球化学特征 |
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| 引用本文： | 张乐彤,李世超,赵庆英,李雪菲,王璐,李子昊.大兴安岭中段白音高老组火山岩的形成时代及地球化学特征[J].世界地质,2015,34(1):44-54. |
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| 作者姓名： | 张乐彤 李世超 赵庆英 李雪菲 王璐 李子昊 |
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| 作者单位： | 吉林大学 地球科学学院，长春 130061 |
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| 摘 要： | 大兴安岭中段柴河地区白音高老组火山岩主要由流纹岩及流纹质火山碎屑岩等一套酸性火山岩组成。锆石SHIRMP U--Pb定年结果显示白音高老组火山岩的年龄为131±1 Ma,为早白垩世。地球化学测试结果显示,白音高老组火山岩属钙碱性系列,其微量元素亏损Ba、Sr、P、Ti、U元素,相对富集Rb、Th、K、Nd、Hf等元素。稀土元素配分曲线右倾,轻重稀土分馏明显,具有明显的Eu负异常。研究表明,白音高老组火山岩来源于下地壳的部分熔融,其形成的构造背景可能为蒙古—鄂霍茨克洋闭合—碰撞造山后的伸展。
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| 关 键 词： | 大兴安岭 白音高老组 火山岩 地球化学 岩浆来源 |
Formation age and geochemical characteristics of volcanic rocks from Baiyingaolao Formation of middle Da Hinggan mountains |
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| ZHANG Le-Tong,LI Shi-Chao,ZHAO Qing-Ying,LI Xue-Fei,WANG Lu,LI Zi-Hao.Formation age and geochemical characteristics of volcanic rocks from Baiyingaolao Formation of middle Da Hinggan mountains[J].World Geology,2015,34(1):44-54. |
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| Authors: | ZHANG Le-Tong LI Shi-Chao ZHAO Qing-Ying LI Xue-Fei WANG Lu LI Zi-Hao |
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| Institution: | College of Earth Sciences，Jilin University，Changchun 130061，China |
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| Abstract: | The volcanic rocks from Baiyingaolao Formation of Chaihe area in Da Hinggan mountains are com- posed of rhyolite and volcanic clastic，which is a set of felsic volcanic rocks． SHIＲMP U- - Pb dating shows that the age of the volcanic rocks of Baiyingaolao Formation is about 131 ±1 Ma，belonging to the Early Cretaceous． The geochemical data show that the volcanic rocks belong to calc- alkaline series，the trace elements are characterized evidently by depletion of Ba，Sr，P，Ti，U，and enrichment of Ｒb，Th，K，Nd，Hf． The ＲEE distribution curves are to the right． LＲEE and HＲEE fraction and Eu negative anomaly are both obvious． Above characteristics indi- cate that the volcanic rocks are likely from lower crustal melting． Tectonic setting of its formation may be the Mon- golia- - Okhotsk Ocean closure- stretch after collision orogeny． |
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| Keywords: | Da Hinggan mountains Baiyingaolao Formation volcanic rocks geochemistry source of magma |
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