期刊文献+

西太平洋海山富钴结壳稀土元素(REE)组成原位LA-ICPMS测定 预览 被引量:12

In-situ LA-ICPMS analysis of rare earth elements of ferromanganese crusts from west Pacific Ocean seamounts
在线阅读 下载PDF
收藏 分享 导出
摘要 利用激光剥蚀电感耦合等离子体质谱(LA—ICPMS)微区原位分析方法,对采自西太平洋海山具完整三层结构的富钴结壳样品进行了稀土元素(REE)含量测定,结果表明,虽然均产于西太平洋海山且均具有明显的三层结构,富钴结壳化学组成受地理位置和沉积环境影响很大。绝大多数西太平洋富钴结壳具有高∑REE、高LREE/HREE、δCe正异常和δEu基本无异常或微弱正异常的特点,显示它们主要由正常海水沉积形成。结壳不同层圈之间REE组成有较大的区别,其原因主要在于其形成环境和矿物组成不同。样品0327稀土元素总量(∑REE)由亮煤层到疏松层到外层逐渐升高,且亮煤层δCe和Y/Ho变化非常大,最大值分别为38.61和105.5,显示该层生长环境较为氧化且相对动荡,而样品0346中三层结构的∑REE都非常高,且变化趋势与0327正好相反,从亮煤层到致密层∑REE有降低的趋势。亮煤层形成时海水相对较氧化的环境有利于铁锰氧化物的形成和Ce^4+等稀土元素的吸附,导致其中EREE较疏松层和外层为高,而后期磷酸盐化导致REE元素的迁移和亏损。在结壳生长剖面上,由最外层到疏松层和亮煤层,δCe呈明显上升趋势,且变化范围趋大,说明该结壳所处的海水环境在由老至新的生长过程中由相对动荡和氧化变为相对平静和还原。 Rare earth elements (REEs) and trace elements compositions of ferromanganese crusts collected from North-West Pacific seamounts were analyzed by using an in-situ laser ablation inductively coupled plasma mass spectrometry (LA-ICAPMS). The results show that records of elements composition of ferromanganese crusts differ significantly between localities even though they have similar oceanographic settings and three-layered structures. Most of these samples show high total REE concentrations ( ∑ REE), high LREE/ HREE, marked positive Ce anomaly ( δCe ) and non- or weakly positive Eu anomaly ( δEu), suggesting that most of them were of hydrogenetic origin. The REE compositions are quite different among various layers in the crusts, which probably results from their different growth environments and different mineral assemblages. In sample 0327, the ∑ REE vary widely over three layers and increasing from inner to outer layers. The values of δCe and Y/Ho in inner layer of sample 0327 are quite high and varies dramatically, with maximums of 38.61 and 105.3 respectively. This shows that growth environment of inner layer of sample 0327 was much more turbulent and oxidized than the ones of other two layers. On the contrary, the ∑ REE in sample 0346 are quite high in all three layers and decline slightly from the inner to outer layers. The relatively oxidized environment of the seawater during growth of the inner layers might favor formation of ferromanganese oxyhydroxides and absorption of Ce4 + , resulting in a higher Ce content and ∑ REE in the inner layers. On the other hand, phosphatization events caused strong depletion of REE in the crusts. In the growth profile of the crusts, ~Ce increasing and varying more greatly from outer to inner layers, suggesting that the growth environments of these crusts varied from relatively turbulent and oxidized to peaceful and reduced during growth.
作者 薛婷 孙晓明 张美 刘珊珊 何高文 王生伟 陆红锋 XUE Ting, SUN XiaoMing, ZHANG Mei, LIU ShanShan, HE GaoWen, Wang ShengWei, LU HongFeng(1. Department of Earth Sciences, Sun Yat-sen University, Guangzhou 510275, China 2. Hidden Deposits Research Institute of Sun Yatsen University & Eastern China Geological & Mining Organization for Non-ferrous Metals, Nanjing 210007, China 3. Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry & South China Sea Institute of Oceanology, Chinese Academy of Sciences Guangzhou 510640, China 4. Guangzhou Marine Geological Survey, The Ministry of Land and Resoures, Guangzhou 510760, China)
出处 《岩石学报》 SCIE CAS CSCD 北大核心 2008年第10期 2423-2432,共10页 Acta Petrologica Sinica
基金 国家自然科学基金(批准号:40473024,40343019)、国际海底区域研究开发”十五”课题(编号:DY105-01-04-13,DY105-01-02-1)、高等学校博士学科点专项科研基金(编号:20040558049)、中国科学院广州地球化学研究所南海海洋研究所边缘海地质重点实验室研究基金课题(编号:MSGLCAS03-4)和国家教育部跨世纪优秀人才培养计划基金联合资助.致谢 样品采集过程中得到国土资源部广州海洋地质调查局样品室的大力协助,测试过程得到西北大学教育部大陆动力学重点学实验室的柳小明老师的协助与指导,同时得到中国大洋协会周宁处长和田赤英女士、广州海洋地质调查局杨胜雄总工和黄永样总工、中国科学院广州地球化学研究所周怀阳研究员等的大力支持,谨致谢忱!
关键词 富钴结壳 稀土元素(REE) 原位分析 激光剥蚀电感耦合等离子体质谱(IJA—ICPMS) Ferromanganese crusts Rare earth elements (REE) In-situ analysis Ablation inductively coupled plasma mass spectrometry (LA-ICP-MS)
  • 相关文献

参考文献41

  • 1Alvarez R, De Carlo EH, Cowen J and Andermann G. 1990.Micromorphological characteristics of a marine ferromanganese crust. Marine Geology, 94 : 239 - 249 被引量:1
  • 2Anders E and Grevesse N. 1989. Abundances of the elements: Meteoritic and solar. Geochimica et Cosmochimica Acta, 53:197 -214 被引量:1
  • 3Aplin AC. 1984. Rare earth element geochemistry of Central Pacific ferromanganese enerustations. Earth and Planetary Science Letters, 71:13-22 被引量:1
  • 4Aplin AC and Cronan DS. 1985. Ferromanganese oxide deposits from the Central Pacific Ocean, Ⅱ. Nodules and associated sediments. Geochimica et Cosmochimica Acta, 49 : 437 - 451 被引量:1
  • 5Bau M, Kosehinsky A. Dulski P and Hein JR. 1996. Comparison of the partitioning behaviours of yttrium, rare earth elements, and titanium between hydrogenetie marine ferromanganese crusts and seawater. Geoehimiea et Cosmochimiea Aeta, 60 : 1709 - 1725 被引量:1
  • 6Bau M, Moller P and Dulski P. 1997. Yttrium and lanthanides in eastern Mediterranean seawater and their fractionation during redox-cycling. Marine Chemistry, 56:123 - 131 被引量:1
  • 7Byrne RH. 2002. Inorganic speciation of dissolved elements in seawater: The influence of pH on concentration ratios. Geochem. Trans, 3 : 11 -16 被引量:1
  • 8Chan LH and Hein JR. 2007. Lithium contents and isotopic compositions of ferromanganese deposits from the global ocean. Deep Sea Research Part Ⅱ: Topical Studies in Oceanography , 54 : 1147 - 1162. 被引量:1
  • 9Chen SY, Zhang HS and Zhao PD.2006. Rare earth element geochemistry of Co-rich crust in the mid-Pacific and South China Sea. Marine Geology & Quaternary Geology. 26 ( 4 ) : 45 - 50 被引量:1
  • 10De Carlo EH. 1991. Paleoceanographic implications of rare earth element variability within a Fe-Mn crust from the central Pacific Ocean. Marine Geology, 98 : 449 -467 被引量:1

同被引文献243

引证文献12

二级引证文献19

投稿分析
职称考试

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部 意见反馈