| 济阳凹陷火山岩的岩石学与地球化学 |
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| 引用本文： | 赵国连.济阳凹陷火山岩的岩石学与地球化学[J].矿物学报,2006,26(3):335-345. |
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| 作者姓名： | 赵国连 |
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| 作者单位： | 中国地质科学院,地质力学所,北京,100081 |
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| 基金项目： | 陆上油气资源评价项目(课题号:200110110002) |
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| 摘 要： | 对济阳凹陷的第三系火山岩、基性侵入岩进行了岩石学和地球化学研究,分别总结了火山岩、基性侵入岩岩石类型及其特征。碱性系列玄武岩主要为钠质系列,具上地幔来源的特征。从古新统到渐新统,玄武岩熔融程度降低,岩浆地幔源深度增加。微量元素和同位素的数据表明,第三纪火山岩源区存在不协调现象。稀土元素分析表明,本区玄武岩为大陆裂谷成因。钐-钕、铷-锶及铅同位素的数据表明,火山岩与侵入岩同源,都来自上地幔。玄武岩浆在形成过程中有过不同程度的混合作用,Rb/Sr相关性表明早、晚第三纪的幔源类型上存在差别。第三纪火山岩数据点分布于DMM,EMIH和EMII三个端元之间,反映第三纪火山岩成因与这三个端元不同程度混合有关。本区火山岩成因与幔源有关,地幔不相容成分的特征表明有沉积物混入的可能,不排除是陆壳物质混入,不同深度岩浆的混合也是一种解释。
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| 关 键 词： | 济阳凹陷 下第三系 玄武岩与辉绿岩 岩石学与地球化学 |
| 文章编号： | 1000-4734（2006）03-0335-11 |
| 收稿时间： | 2005-11-21 |
| 修稿时间： | 2005年11月21 |
PETROLOGY AND GEOCHEMISTRY OF IGNEOUS ROCKS IN JIYANG DEPRESSION |
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| ZHAO Guo-lian.PETROLOGY AND GEOCHEMISTRY OF IGNEOUS ROCKS IN JIYANG DEPRESSION[J].Acta Mineralogica Sinica,2006,26(3):335-345. |
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| Authors: | ZHAO Guo-lian |
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| Institution: | Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China |
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| Abstract: | This paper mainly deals with the petrology and geochemistry, of Tertiary igneous rocks and basic intrusive rocks, and summarizes the rock types of igneous rocks and intrusive rocks. Based on the data of major elements, trace elements and rare-earth elements, and analysis of Sm-Nd, Rb-Sr and Pb isotopes, the author proposed that basalts of alkaline series mainly belong to sodium series, characteristic of the upper mantle. From Paleocene to Oligocene, melting degree of basalt was lowering, depth of magma derivation increased. From the analysis of rare-earth elements, the basalts of this region were formed in continental rifts. Sm-Nd, Rb-Sr and Pb isotope data show that the igneous rocks and intrusive rocks are same in origin, they all come from the upper mantle. Basalt magma experienced mixing to varying degree. The Rb/Sr data showed that the magma types of Early Tertiary and Late Tertiary are different. On the diagram of ^206Pb/^204Pb-ENd, the data of Tertiary igneous rocks fall in the areas of DMM, EMI and EMII. It is shown that the igneous rocks are mixed. The magma of the igneous rocks is of mixed origin, but may not experience fractionation, it keeps the original characteristics. The incompatible elements were brought in by sediments, so the author did not exclude the possibility of continental crust mixing. So the origin is uncertain, mixing of magmas at different depths is an explanation on a trial basis. |
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| Keywords: | Jiyang Depression Lower Tertiary basalt and diabase petrology and geochemistry |
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