老挝Boloven高原玄武岩风化壳中稀土元素富集与主量元素关系
Rare Earth Element Enrichment and Its Relationship to Major Elements of Weathering-Basalt Profile in Boloven Plateau, Lao PDR
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文摘
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老挝南部Champasak省东北部Boloven高原玄武岩喷发于晚中生代-新生代,在长期热带季风型气候和热带季雨林植被条件下,高原玄武岩上已经发育砖红壤型风化壳.在一条风化壳剖面上采集了11件样品并在室内细碎到200目,使用X射线荧光光谱仪分析了11个样品中的主量元素含量,使用ICP-MS分析了11件样品REE含量.结果表明,玄武岩风化壳中主量元素Na_2O和MgO淋失量最大,K_2O和CaO淋失量次之,并在淋失一定程度后淋失速度减慢;样品LR157和LR158中TiO_2,P_2O_5分别为6.07%,1.45%和8.43%,0.82%,为整个剖面中的最高值;CaO的含量是松散风化产物中的最高值.风化玄武岩(LR140,LR141)的∑REE较低,为57.8×10~(-6)和87.9×10~(-6);随着玄武岩风化程度和成壤作用的加强,∑REE逐渐富集,并在风化壳表土下(LR157,LR158)达到最高值1003×10~(-6)和775×10~(-6).风化壳中LREE/HREE值为3.59～14.9,稀土元素分布型式属轻稀土富集型.随着风化程度加深,Ce由弱负异常逐渐变为强正异常,而Eu由弱正异常逐渐变小并呈现出强负异常,整个剖面中Ce正负异常和Eu正负异常的变化幅度较大.REE在剖面中的分布与含TiO_2,P_2O_5的矿物有明显的相关关系,并且在TiO_2,P_2O_5含量最高的样品LR157和LR158中最为富集.REE富集和Ce正异常出现在pH值为5.23～6.12的酸性和Fe~(2+)/Fe~(3+)为0.007～0.13的氧化环境下,证明在酸性氧化环境也能出现REE富集. |
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其他语种文摘
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Located in northeast Champasak Province,Lao PDR and having erupted in later Mesozoic-Cenozoic,the basalt of Boloven Plateau has formed a well-developed lateritic regolith(weathering crust) under long-term tropical monsoon climate and tropical monsoon forest.In a site on Boloven Plateau 11 samples of a regolith profile were collected,and then pulverized to 200 meshes in laboratory.All the 11 samples were analyzed for major elements and REE concentrations by mean of XRF and ICP-MS respectively.The analytical results of major elements showed that Na_2O and MgO were leached the most,followed by K_2O and CaO with slowly leaching velocity while to some leaching amount in the whole profile.TiO_2,P_2O_5 in LR157 and LR158 were 6.07%,1.45% and 8.43%,0.82% respectively which were the highest values in all 11 samples,and the same as CaO in LR157 and LR158.∑REE in weathering basalt(LR140,LR141) were 57.8×10~(-6) and 87.9×10~(-6),obviously lower than most other samples.In addition,while weathering and pedogenesis increasing,∑REE were consequently gradually enriched up to 775×10~(-6) and 1003×10~(-6) under the top soil(LR158,LR157).LREE/HREE ratios of all samples,ranging from 3.59 to 14.94,showed a typical pattern of enrichment in LREE in chondrite normalization plots.When weathering was developed,Ce gradually rose to strongly positive anomaly from a slightly negative anomaly,and on the contrary Eu gradually decreased to more strongly negative anomaly from a slightly positive anomaly.The extents of variation of Ce and Eu anomalies were relatively significant in whole profile.There was obvious correlativity between REE and minerals hosting P_2O_5 or TiO_2.And ∑REE reached to the highest values in LR157 and LR158 where P_2O_5 and TiO_2 had the highest values also.The enrichment of ∑REE and positive anomaly of Ce were present under acid-oxidizing environment(pH ranging from 5.23 to 6.12 and Fe~(2+)/Fe~(3+) 0.007～0.13).It suggested ∑REE could be enriched under acid-oxidizing environment. |
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来源
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中国稀土学报
,2007,25(4):461-469 【核心库】
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关键词
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老挝Boloven高原
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玄武岩风化
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REE富集
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地址
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中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵州, 贵阳, 550002
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北京东南亚资源科技有限公司, 北京, 100012
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有色金属矿产地质调查中心北京资源勘查技术中心, 北京, 100012
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-4343 |
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学科
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化学;地质学 |
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基金
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中国科学院贵阳地球化学研究所矿床地球化学中国科学院重点实验室基金
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国家财政部境外矿产资源风险勘查项目
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文献收藏号
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CSCD:2907082
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