| Rare Earth Elements Compositions and Genesis of Xinhua Large-Scale Phosphorite Deposit in Western Guizhou, China |
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| 引用本文： | 王敏,孙晓明,马名扬. Rare Earth Elements Compositions and Genesis of Xinhua Large-Scale Phosphorite Deposit in Western Guizhou, China[J]. 中国稀土学报(英文版), 2005, 23(3): 323-330 |
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| 作者姓名： | 王敏 孙晓明 马名扬 |
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| 作者单位： | State Key Laboratory of Organic Geochemistry，Guangzhou Institute of Geochemistry，Chinese Academy of Sciences，Guangzhou 510640，China，Department of Earth Sciences，Sun Yat-Sen University，Guangzhou 510275，China，State Key Laboratory of Organic Geochemistry，Guangzhou Institute of Geochemistry，Chinese Academy of Sciences，Guangzhou 510640，China，National Key Laboratory for Mineral Deposit Research，Nanjing University，Nanjing 210093，China，Department of Earth Sciences，Sun Yat-Sen University，Guangzhou 510275，China |
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| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划)，教育部跨世纪优秀人才培养计划，国家重点实验室基金 |
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| 摘 要： | Zhijin County in Western Guizhou is one of the most important production areas of phosphorites in China. In order to investigate genesis of the phosphorites, their REE compositions were analyzed by using inductively coupled plasma emission mass spectrometry (ICP-MS) method. For comparison, phosphorites from the Lower Cambrian black rock series in Southern China, such as Zunyi in Guizhou and Zhangjiajie in Hunan Province, were also analyzed. The analytical data show that: (1) Xinhua phosphorites possess a quite high and greatly varied total rare earth elements (ΣREE), which varying between 164.23×10-6 and 1395.01×10-6 with average of 642.54×10-6, remarkable differentiation between light (LREE) and heavy rare earth elements (HREE), and the ΣLREE/ΣHREE ratios varying between 5.04 and 6.52. The ΣREE and ΣLREE/ΣHREE ratios of the Zunyi and Zhangjiajie phosphorites are 156.69×10-6～637.41×10-6 with average of 431.75×10-6 and 3.17～6.95 with average of 4.37 respectively; (2) All the phosphorites from Xinhua, Zunyi and Zhangjiajie show remarkable negative Ce anomalies. Besides, the Xinhua phosphorites possess lower δCe, which varying between 0.26 and 0.53 with average of 0.35, while δCe of the Zunyi and Zhangjiajie phosphorites are 0.30～0.66 with average of 0.47, suggesting that all of the phosphorites are typical marine sediments deposited mainly in ancient peri-continental seas, and the depositional position of the Xinhua phosphorite might be deeper; (3) Most phosphorites from Xinhua, Zunyi and Zhangjiajie possess unremarkable positive Eu anomaly, and only a few of samples show obvious ones. The δEu varies between 0.98 and 2.4, suggesting that hot (>200 ℃) and strong reductive hydrothermal fluids might have been involved in genesis of the phosphorites; (4) The Xinhua phosphorite is relatively depleted in HREE, and LaN/NdN and δY of most samples are >1 and >1.5 respectively. Besides, there exists no correlation between δY and δCe, suggesting that the phosphorite was subjected to quite strong weathering and leaching processes, and catagenesis do not greatly modify its REE compositions.
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| 关 键 词： | 磷灰石 贵州 稀土 寒武纪 地质条件 |
Rare Earth Elements Compositions and Genesis of Xinhua Large-Scale Phosphorite Deposit in Western Guizhou, China |
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| Wang Min,Sun Xiaoming,MA Mingyang. Rare Earth Elements Compositions and Genesis of Xinhua Large-Scale Phosphorite Deposit in Western Guizhou, China[J]. Journal of Rare Earths, 2005, 23(3): 323-330 |
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| Authors: | Wang Min Sun Xiaoming MA Mingyang |
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| Abstract: | |
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| Keywords: | phosphorite Lower Cambrian black rock series Zhijin County of Western Guizhou rare earths |
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