| 庐枞盆地正长岩类地球化学特征及成因探讨 |
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| 引用本文： | 李洪英,张荣华,胡书敏.庐枞盆地正长岩类地球化学特征及成因探讨[J].吉林大学学报(地球科学版),2009,39(5). |
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| 作者姓名： | 李洪英 张荣华 胡书敏 |
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| 作者单位： | 中国地质科学院,矿产资源研究所,北京,100037 |
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| 基金项目： | 中央级公益性科研院所基本业务费项目，财政部科学专项 |
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| 摘 要： | 研究了庐枞盆地正长岩类的时空分布规律,并对其地球化学特征和成因进行了探讨.庐枞盆地正长岩类呈北东向展布于盆地的内部和外围.通过对正长岩类进行主量和微量元素的测试分析发现:SiO2质量分数变化范围为60.86%～68.85%,全碱值(K2O+Na2O)均在9.82%以上,里特曼指数均大于3.73,为碱性系列;在K2O-SiO2图上,岩石样品全部落在含钾较高的钾玄岩系列中;在微量元素组成上,与原始地幔岩相比,样品的微量元素均有不同程度的富集,富集轻稀土元素(LREE)和大离子亲石元素(LILE),亏损高场强元素Nb、Ti等;稀土总量(∑REE)变化范围为(205.16～496.61)×10-6.反映了庐枞盆地正长岩类成岩物质来源较深,是来自富集地幔的碱性玄武岩浆在沿深大断裂上升侵位过程中,受到部分陆壳物质的混染而成.
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| 关 键 词： | 正长岩 地球化学 岩石成因 庐枞盆地 |
Geochemical Characteristics of Syenite and Its Genesis in the Luzong Basin |
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| LI Hong-ying,ZHANG Rong-hua,HU Shu-min.Geochemical Characteristics of Syenite and Its Genesis in the Luzong Basin[J].Journal of Jilin Unviersity:Earth Science Edition,2009,39(5). |
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| Authors: | LI Hong-ying ZHANG Rong-hua HU Shu-min |
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| Institution: | LI Hong-ying,ZHANG Rong-hua,HU Shu-minInstitute of Mineral Resources,Chinese Academy of Geosciences,Beijing 100037,China |
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| Abstract: | Majory and trace elements compositions of the syenite in the Luzong basin show that SiO2 contents of the syenite are 60.86%-68.85%,with total alkaline(Na2O+K2O) values of more than 9.82%,Rittman indexs of more than 3.73 basically,and high K2O contents,which indicate that the rock can be assigned to high potassium shoshonite series.In addition,the rock is enriched in large ion lithophile elements,such as Rb,U,Th and Pb,but relatively depleted in high field strength elements,such as Nb,Ti.Total values of rare... |
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| Keywords: | syenite geochemistry petrogenesis Luzong basin |
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