| 济阳坳陷第三纪火成岩地球化学特征研究 |
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| 引用本文： | 张玉涛.济阳坳陷第三纪火成岩地球化学特征研究[J].地质科学,2014,0(1):275-286. |
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| 作者姓名： | 张玉涛 |
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| 作者单位： | 中国地质科学院矿产资源研究所区域成矿规律研究室 北京 100037 |
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| 基金项目： | 国家自然科学基金项目(编号:40803012);中国主要沉积盆地火成岩发育特征及其与深部流体关系研究项目(编号:YPH08064)资助 |
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| 摘 要： | 对济阳坳陷第三纪火成岩样品进行了系统的地球化学分析，分析结果表明：这些火成岩的SiO2含量较低（大部分低于50%），属于基性火成岩，岩石类型主要为玄武岩和粗面玄武岩。绝大部分样品的TiO2含量较高，为1.64%～2.09%，不同于TiO2含量较低的岛弧火山岩。碱性样品和亚碱性样品数量相当，Na2O含量都高于K2O含量，Na2O/K2O最高可达2.75。这些样品具有富集大离子亲石元素（LILE）如Rb和Ba，亏损重稀土元素（HREE）如Yb和Lu。具有右倾的球粒陨石标准化稀土元素配分模式和原始地幔标准化不相容元素分布模式。源区分析表明，这些火成岩的源区为富集的受过流体交代的岩石圈地幔。运用不活动元素对这些样品进行了构造环境的判别，结果表明这些样品的主体形成于板块内部环境。
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| 关 键 词： | 济阳坳陷 第三纪 火成岩 地球化学 |
| 收稿时间： | 2013-05-28 |
| 修稿时间： | 2013-05-28; |
Geochemical features of Tertiary igneous rocks from the Jiyang Basin |
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| Zhang Yutao.Geochemical features of Tertiary igneous rocks from the Jiyang Basin[J].Chinese Journal of Geology,2014,0(1):275-286. |
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| Authors: | Zhang Yutao |
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| Institution: | Division of Metallogeng, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037 |
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| Abstract: | Geochemical analyses were made for some Tertiary igneous rocks from the Jiyang Basin in this paper. The igneoug rocks are all mafic with SiO2 contents mostly below 50%,and are dominantly basalts and trachybasalt. Most of the igneous rocks have higher TiO2 contents(1.64%～2.09%) in comparison with typical island-arc basalts. The volcanic strata include equal amounts of alkaline and sub-alkaline rock,with high Na2O/K2O ratios(up to 2.75). The samples have enriched large ion lithophile elements(LILE) such as Rb and Ba,and depleted heavy rare earth elements(HREE).They have strongly fractionated REE in chondrite normalized rare earth element distribution and primitive mantle normalized incompatible elements diagrams. It is proposed that the source of the igneous rocks is lithospheric mantle that have been metasomatised by fluids enriched in LILE. Discrimination diagrams using immobile elements indicate that the volcanics were likely formed in a within-plate environment. |
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| Keywords: | Jiyang Basin Tertiary Ignous rocks Geochemistry |
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