东太平洋海盆多金属结核的物质组构及形成环境意义  

The Composition and Structures of Polymetallic Nodules from the East Pacific Bas in and Their Reflection on Environment

作　　者：杜灵通[1] 吕新彪[1] 

机构地区：[1]中国地质大学研究生院,武汉430074

出　　处：《世界科技研究与发展》2003年第4期84-87,共4页World Sci-Tech R&D

摘　　要：运用反光显微镜、电子探针对东太平洋CC区多金属结核中壳层构造及鲕粒的韵律层进行了初步的研究。结果表明 ,多金属结核的构造及其形成是环境的反映。结核中鲕粒的微纹层构造是结核形成时的一个较短时间段内海洋环境的演化反映。鲕粒纹层的反射率与鲕粒中的δ -MnO2结晶程度有关 ,每层的元素含量与形成时环境的Eh、pH值有关 。We study the structures and rhythm layer of oolite in the polymetallic nodules from the East Pacific Basin using the Microscope and Microprobe. The re sult indicates that the structure is a reflection of environment that nodule has grown in. Different environment causes different structures in nodules. From th e composition and change of elements in the rhythm layer, we can get that the di fferent reflectivity in oolite is not the result of mineral composition. It just owe to these mineral which have a various crystallinity caused by the botto m water from Antarctica and other ocean affairs. Apart from this, we can conclud e that the rhythm layer is also indicates the change of environment, such as Eh, pH, and other environmental parameters. Because the layer is very thin, it only reflects a comparatively short time in geohistory.

关 键 词：多金属结核 显微结构 电子探针分析 东太平洋 元素含量 鲕粒 地质 古海洋环境 

分 类 号：X145[环境科学与工程—环境科学]