中太平洋海山区富钴结壳构造与地球化学特征及意义  

Texture and Geochemical Characteristics of Co-riched Crust From the Mid-Pacific Seamounts and Their Implications

作　　者：崔迎春[1] 任向文[2] 刘季花[2] 石学法[2] 尹京武[3] 郝金华[3] 

机构地区：[1]中国科学院海洋研究所,山东青岛266071 [2]海洋沉积与环境地质国家海洋局重点实验室 [3]中国地质大学,北京100083

出　　处：《海洋科学进展》2008年第1期35-43,共9页Advances in Marine Science

基　　金：国家自然科学基金项目--富钴结壳生长界面对其成矿过程的制约(40706029);太平洋水成铁锰沉积的胶体地球化学成矿动力学(40376016);国际科技合作项目--深海多金属成矿作用和成矿系统研究(2006DFB21620);国家海洋局青年基金--西太平洋富钴结壳典型构造层与其元素富集特征对应性研究(2005304)

摘　　要：为了释读蕴藏在富钴结壳中的环境变化信息,运用电子探针技术对中太平洋海山CXD05结壳进行了详细的构造和地球化学研究。结果表明:1)CXD05结壳约从19.4 Ma BP(早中新世)开始发育,从基部至顶部依次发育了斑杂构造、柱状构造和纹层构造;2)结壳中亲氧元素和碎屑组分从老至新发生规律性变化。结壳构造序列反映了其生长过程中海洋动力环境能量由高到低的变化;而壳层亲氧元素和碎屑组分的变化则记录了海水的氧化程度和风尘影响强度的变化。In order to interprete the paleoenvironmental information recorded in the Co-rich crust, the electronic probe technique was used to study the texture and geochemical characteristics of Crust CXD05 from the Mid-Pacific seamounts. It is shown from the study results that （1） Crust CXD05 stated to grow from 19.4 Ma BP （early Miocene）, and the textures in the crust from bottom to top are mottled texture, columnar texture and laminar texture, respeotively; （2）oxyphile elements and detrital compositions in the crust change regularly from old texture to young texture. The texture series in the crust reflect the variations in the marine environmental energy from high energy to low energy in its growth process, and the variations in oxyphile elements and detrital compositions in the crust recorded the variations in oxidation degree of ambient seawater and influence intensity of eolian dusts.

关 键 词：中太平洋海山 富钴结壳 显微构造 地球化学 

分 类 号：P736.4[天文地球—海洋地质]