首页 | 本学科首页   官方微博 | 高级检索  
     检索      

基于连续沥取的富钴结壳成因机制的探讨
引用本文:蔡毅华,黄奕普,邢娜.基于连续沥取的富钴结壳成因机制的探讨[J].台湾海峡,2011,30(1):1-9.
作者姓名:蔡毅华  黄奕普  邢娜
作者单位:厦门大学海洋学系,福建,厦门,361005
基金项目:中国大洋协会国际海底区域研究开发"十一五"项目
摘    要:根据连续沥取实验结果及相关文献,富钴结壳的生长可用一个双阶段胶体-化学吸附模型来说明.第一阶段是混合胶体的形成及元素的清除与富集,富氧的底层水与缺氧、富Mn2+的中层水体混合,Mn2+被氧化而形成MnO2胶体,并与水柱中的Fe(OH)3、Al(OH)3、SiO2、Ti(OH)4等胶体形成多种混合胶体MnO2-Fe(OH)3、Fe(OH)3-Ti(OH)4和Fe(OH)3-Al(OH)3-SiO2],后者根据各自的表面物理化学特征吸附和富集不同的元素;第二阶段是混合胶体的沉积及富钴结壳的生长,第一阶段形成的混合胶体在海山基岩上以氧化物或氢氧化物的形式沉积,吸附的元素结合进矿物点阵,然后通过自催化或自反馈的方式生长.在富钴结壳生长中,生物起着重要的作用,包括为富钴结壳的生长提供大量的成矿物质、对Mn2+的催化氧化作用及在铁锰胶体的沉淀及富钴结壳壳层的生长过程中的媒介作用.

关 键 词:海洋化学  富钴结壳  成因  胶体化学吸附模型  生物作用

Genesis of Co-rich crust from sequential leaching
CAI Yi-hua,HUANG Yi-pu,XING Na.Genesis of Co-rich crust from sequential leaching[J].Journal of Oceanography In Taiwan Strait,2011,30(1):1-9.
Authors:CAI Yi-hua  HUANG Yi-pu  XING Na
Institution:(Department of Oceanography,Xiamen University,Xiamen 361005,China)
Abstract:Based on the results of the sequential leaching of two Co-rich crusts from the western and central Pacific Ocean and related literature,a double stage colloid-chemical model was adopted to demonstrate the growth of Co-rich crusts.In the first stage,Mn2+ is oxidized and forms MnO2 colloids after the Mn2+-rich and anoxic intermediate water mixes with oxygen-rich deep water.The MnO2 colloid together with other colloids in seawater produce mixed colloids such as MnO2-Fe(OH)3,Fe(OH)3-Ti(OH)4 and Fe(OH)3-Al(OH)3-SiO2.These mixed colloids sca-venge elements from ambient seawater consistent with their surface physiochemical characteristics.In the second stage,these mixed colloids precipitate on the substrate rocks of seamounts as oxides or hydroxides and incorporate the adsorbed elements into the mineral phases before the crust grows autocatalytically or via auto-feedbacks.Furthermore,biological activity may play an important role in the growth of Co-rich crusts as follows:(1) the dissolution of calcareous plankton skeletons may provide abundant mineral materials for the growth of Co-rich crusts;(2) microbial activity may accelerate the oxidation of Mn2+ and(3) act as a catalyst during the precipitation of ferromanganese colloids and the growth of Co-rich crust lamellas.
Keywords:marine chemistry  Co-rich crusts  genesis  colloid-chemical model  biological activity
本文献已被 CNKI 维普 万方数据 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号