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| 广西凭祥英安岩中方解石稀土元素地球化学研究 | |
| 引用本文： | 顾尚义,万国江,毛健全.广西凭祥英安岩中方解石稀土元素地球化学研究[J].地球与环境,2007,35(1):51-56. |
| 作者姓名： | 顾尚义 万国江 毛健全 |
| 作者单位： | 1. 贵州大学资源与环境工程学院,贵州,贵阳,550003;喀斯特环境与地庐灾害防治教育部重点实验室,贵州,贵阳,550003 2. 中国科学院地球化学研究所环境地球化学国家重点实验室,贵州,贵阳,550002 3. 贵州大学资源与环境工程学院,贵州,贵阳,550003 |
| 摘 要： | 通过对广西凭祥英安岩中方解石的稀土元素含量的测定,结果表明方解石具有与英安岩相似的稀土含量、轻稀土富集、无铈异常和具有明显的铕负异常等特点。结合英安岩的矿物组成和蚀变特征及其方解石的碳氧同位素组成,推测方解石是英安岩蚀变的产物,其稀土元素主要来源于英安岩,英安岩中黑云母蚀变形成绿泥石及方解石优先结合轻稀土是方解石相对英安岩富集轻稀土的主要原因,而方解石相对英安岩较弱的铕负异常主要是英安岩中斜长石优先蚀变的结果。 |
| 关 键 词： | 英安岩 方解石 稀土元素 地球化学 凭祥 |
| 文章编号： | 1672-9250（2007）01-0051-06 |
| 修稿时间： | 2006-07-01 |
RARE EARTH ELEMENTS GEOCHEMISTRY IN CALCITE IN DACITE OF PINGXIANG,GUANGXI |
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| GU Shang-yi,WAN Guo-jiang,MAO Jian-quan.RARE EARTH ELEMENTS GEOCHEMISTRY IN CALCITE IN DACITE OF PINGXIANG,GUANGXI[J].Earth and Environment,2007,35(1):51-56. | |
| Authors: | GU Shang-yi WAN Guo-jiang MAO Jian-quan |
| Institution: | 1. Guizhou University, Guiyang 550003, China; 2. Key Laboratory of Karst Environment and Geohazard Prevention (Guizhou University |
| Abstract: | Rare earth elements(REE) in calcite in dactie of Pingxiang,Guangxi,were analyzed.The results showed that both dacite and calcite have some similar characteristics,such as similar REE concentrations,LREE enrichment,no Ce anomaly,and obvious negative Eu anomaly.Combined mineralogy and alteration of dacite with carbon and oxygen isotopes of calcite,it is inferred that calcite in dacite is altered from dacite reaction with oceanic water and REE is mainly derived from dacite.The reason of more LREE enriched in calcite than dacite is that biotite altered to chlorite and that LREE are preferred to be accommodated in calcite.The relatively weak Eu negative anomaly in calcite is mainly attributed to feldspar alteration in dacite of Pingxiang. |
| Keywords: | dacite calcite rare earth element geochemistry Pingxiang |
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