中文摘要：

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19．4MaBP（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。

英文摘要：

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.