| REE geochemistry of Early Cambrian phosphorites from Gezhongwu Formation at Zhijin, Guizhou Province, China |
| |
| 作者姓名： | 施春华 胡瑞忠 |
| |
| 作者单位： | [1]KeyLaboratoryofOreDepositGeochemistry,InstituteofGeochemistry,ChineseAcademyofScierwes,Guiyang550002,China／／GraduateSchool,ChineseAcademyofSciences,Beijing100039,China [2]KeyLaboratoryofOreDepositGeochemistry,InstituteofGeochemistry,ChineseAcademyofScierwes,Guiyang550002,China |
| |
| 摘 要： | The Cambrian Gezhongwu Formation in Southwest China is the lowest Cambrian phosphorite unit. The Formation belongs to the Meishucun stage with small shelly fossils. Rare-earth element (REE)data from the Gezhongwu phosphorites of Zhijin documented the depositional conditions. The total REE concentrations are high in the Gezhongwu phosphorites, which are especially rich in yttrium. The PAASnormalized REE patterns of the Gezhongwu phosphorites are characterized by negative Ce anomalies and slight enrichment of MREE, as being hat-shaped. The hat-shaped patterns suggest that the REE originated from depositional environments rather than from subsequent diagenesis. The negative Ce anomalies indicate that the depositional environments are oxic. The positive Eu anomaly, the high total REE and the hatshaped REE pattern revealed contributions from the normal marine environment mixed with hydrothermal water to the REE budget of the Gezhongwu phosphorites.
|
| 关 键 词： | 磷灰石 中国西南 寒武纪 稀土元素 |
REE geochemistry of Early Cambrian phosphorites from Gezhongwu Formation at Zhijin,Guizhou Province,China |
| |
| Shi Chunhua,Hu Ruizhong.REE geochemistry of Early Cambrian phosphorites from Gezhongwu Formation at Zhijin, Guizhou Province, China[J].Chinese Journal of Geochemistry,2005,24(2):166-172. |
| |
| Authors: | Shi Chunhua Hu Ruizhong |
| |
| Institution: | (1) Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 550002 Guiyang, China;(2) Graduate School, Chinese Academy of Sciences, 100039 Beijing, China |
| |
| Abstract: | The Cambrian Gezhongwu Formation in Southwest China is the lowest Cambrian phosphorite unit. The Formation belongs to the Meishucun stage with small shelly fossils. Rare-earth element (REE) data from the Gezhongwu phosphorites of Zhijin documented the depositional conditions. The total REE concentrations are high in the Gezhongwu phosphorites, which are especially rich in yttrium. The PAAS-normalized REE patterns of the Gezhongwu phosphorites are characterized by negative Ce anomalies and slight enrichment of MREE, as being hat-shaped. The hat-shaped patterns suggest that the REE originated from depositional environments rather than from subsequent diagenesis. The negative Ce anomalies indicate that the depositional environments are oxic. The positive Eu anomaly, the high total REE and the hat-shaped REE pattern revealed contributions from the normal marine environment mixed with hydrothermal water to the REE budget of the Gezhongwu phosphorites. |
| |
| Keywords: | phosphorite Cambrian REE Guizhou Province |
| 本文献已被 CNKI 维普 万方数据 SpringerLink 等数据库收录！ |
|
